Quantifying the effects of rangeland conversion on ecosystem functions: Linking land use systems to enhance farm profitability

Final report for SW19-908

Project Type: Research and Education
Funds awarded in 2019: $349,327.00
Projected End Date: 02/28/2023
Host Institution Award ID: G255-19-W7500
Grant Recipients: UC Division of Agriculture and Natural Resources; Southern Illinois University
Region: Western
State: California
Principal Investigator:
Fadzayi Elizabeth Mashiri
University of California
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Project Information

Summary:

Conversion of land use in western states has increased over the past few years. In California, land use conversion is typified by 1..depletion of rangeland to cropland and to urbanization. Between 1983 and 2008 for example, approximately 20,000 acres of prime rangeland were lost every year, mainly in the Central Valley region. While it is generally recognized that the rapid and widespread conversion of rangeland in the absence of sound conservation management would negatively affect ecosystem services, little is known about the full range of ecosystem changes (negative and positive) that occur on converted grounds of rangeland. This project will provide new insights into the essentials of ecosystem function changes during rangeland conversion to cropland. The project will also examine areas where rangeland functionality is weak in terms of soil health and develop extension and educational strategies to propose remediation/conservation measures that optimize rangeland ecosystem functions while maintaining and improving rangeland economic returns. We will use field data collection and computer modeling to evaluate the impacts of rangeland conversion on ecosystem functionality by comparing environmental quality data between rangeland and almond fields. We will set up and monitor three study sites, each with a rangeland site adjacent to almond orchards over a period of three years in collaboration with producers. We will collect field data to compare how infiltration, water flux, evapotranspiration (ET), soil nutrient content, runoff, soil microbial activity, soil carbon, plant production, plant, vertebrate and invertebrate species diversity, weed infestation, and soil compaction vary between rangeland and almond orchard sites. We will use modeling to evaluate the impacts of various conversion arrangements on hydrology at a watershed scale and explore the potential for linking and integrating production systems (i.e. mixed production approach) that can enhance overall ranch and farm profitability. We will also utilize the exiting literature to identify the institutional requirements for building resilience in rangelands, and apply those insights in analyzing the existing policies and institutional mechanisms for the governance of rangelands in the Central Valley of California. We will monitor the initial costs of converting rangeland to cropland and costs associated with maintaining recently established cropland given potential changes in ecosystem functions. We will monitor revenue per acre earned from recently converted cropland across various potential crops and compare to returns earned over time. Data collected will be used to construct a simulation model to test economic implications of conversion over time. We expect this project to lead to improved recommendations for conversion of rangelands in California and western states in order to help optimize environmental sustainability of rangelands. The project will provide science-based information to assist producers and ranchers determine which conservation practices/arrangements may work in their operations. The installation and results of this project will be incorporated into Extension and Outreach programming and other educational activities that will be released through a variety of outlets to inform producers and ranchers about the potential ecosystem changes that occur following conversion of rangelands.

Project Objectives:

The goal of this project is to provide insight into the basics of negative and positive ecosystem function changes during rangeland conversion to cropland. The project will propose measures to optimize rangeland ecosystem functions and will also explore the potential for establishing more integrated yet diversified agricultural production systems when land use changes occur to improve ecological sustainability. The specific objectives of this projects are to:

  1. Establish field study sites for educational demonstration of rangeland conversion to cropland;
  2. Evaluate the impacts of rangeland conversion on ecosystem functions (plant production, species diversity, soil condition and water budget) at field scales;
  3. Use modeling to evaluate watershed scale impacts of selected ecosystem functions of rangeland conversion to cropland;
  4. Synthesize the relevant literature to identify the institutional requirements for enhancing resilient rangeland systems, and assess the performance of existing institutional mechanisms for the governance of rangelands and their adequacy in promoting sustainable and resilient working landscapes.
  5. Evaluate the on-farm and off-farm costs of rangeland conversion to cropland and costs of maintaining converted cropland given potential changes in ecosystem functions over time.
  6. Develop appropriate farm and watershed level management strategies to optimize farm/ranch profitability and ecological sustainability; and
  7. Disseminate research findings to
Timeline:

The proposed project milestones and timeline are shown below.

Cooperators

Click linked name(s) to expand/collapse or show everyone's info
  • Dr. Laurent Ahiablame (Educator and Researcher)
  • Dr. Kofi Akamani (Educator and Researcher)
  • Theresa Becchetti (Educator and Researcher)
  • Diane Bohna - Producer (Educator and Researcher)
  • Rose Marie Burroughs - Producer (Educator and Researcher)
  • Dr. Anthony Fulford (Educator and Researcher)
  • Dr. Phoebe Gordon
  • Paul Ichord - Producer
  • Pamela Kan-Rice (Educator and Researcher)
  • Dr. Fadzayi Mashiri (Educator and Researcher)
  • Dr. Daniel Sumner (Educator and Researcher)

Research

Hypothesis:

Land-use conversion from rangelands to orchards is associated with changes in ecosystem functions (soil organic matter, nutrient content, water infiltration, plant and insect diversity, and production) which in turn affect ecosystem services provided by landscapes.

This project focuses on analyzing ecosystem changes, both positive and negative and explores the potential to integrate land-use systems,  determine complementarity between mixed land uses, and evaluate watershed management strategies that can be adopted with the conversion of land use to optimize farm/ranch profitability.

The study investigates also the drivers behind the decisions for land-use change and the socio-economic implications of the changes.

Materials and methods:

Completed Activities:

Activity 1: Set up 3 study sites with rangelands in proximity to almond orchards (2 conventional and 2 integrated), and two age groups (young <6 years and old >8 years) with help from the collaborating producers. Samples are collected in three macroplots in each production system (rangelands and orchards ) with four soil samples collected within each macroplot. In the orchard systems, two samples are collected within rows about half-point between a central tree within the macroplot and two neighboring trees; and two samples between rows of the almond trees to capture potential differences in the two microsites of the almond orchards.

Activity 2: Collected 84 soil samples to evaluate the effects of rangeland conversion on soil health and condition All soil samples were analyzed for nutrient availability, microbial activity, soil structure, and water budget.

Activity 3: Eighty-four soil cores were collected to measure seed bank plant diversity in the orchard and rangeland systems. The soil cores were broken up and seeded and grown in pots in a greenhouse. Plant species and their respective number were recorded.

Activity 4: We measured 2 seasons of herbaceous plant production and diversity at peak standing biomass in late spring on rangelands only. Data were collected using the harvest method in 20 randomly placed 30 x 30 cm quadrats within the 10 x 50m macroplots. Weed management in orchard systems where most weed treatment is preemergent created a scenario that limited the use of such data for comparison with rangeland data. As a result, we decided against collecting herbaceous plant biomass in orchards.

 

Ongoing and future activities:

Activity 5: Insect diversity samples were collected in 3 different ways every two weeks from spring to early summer of 2021. During every sampling period: 84 pitfall trap samples, 28 sticky trap samples, and 28 sweep net samples were collected. Insect Identification is still ongoing.  

Activity 6:  Use modeling to evaluate watershed-scale impacts of selected ecosystem functions of rangeland conversion to cropland. To get more accurate models we installed soil sensors to detect water movement through the soil profile, which we will use as ground-truthing data that can calibrate the hydrology models. The next steps include evaluating changes in water quantity and quality following the conversion at a watershed scale using the Soil and Water Assessment Tool (SWAT). Quantify the dynamic balance of water in the soil profile at the field and watershed scale.

Activity 7: Identify the institutional requirements for enhancing resilient rangeland systems, and assess existing policies and institutional mechanisms for the governance of rangelands. Based on the assumption that rangeland systems are complex social-ecological systems that are constantly exposed to multiple drivers of change to which they must build the capacity for adaptation and transformation in order to be sustainable, we will conduct a comprehensive review of the literature to identify the institutional requirements for the sustainable governance of rangeland systems.

Activity 8: Work to evaluate the costs of rangeland conversion to cropland and costs of maintaining converted cropland given potential changes in ecosystem functions over time will start this summer. We will use established methodologies (almond harvest, and forage production estimates) to assess the costs and returns on newly converted cropland for various crops typically grown in the study region.

Activity 9: As the data analysis continues and clear patterns emerge we will start developing more holistic farm and watershed level management strategies to optimize farm/ranch profitability and ecological sustainability.

Activity 10: Disseminate research findings to stakeholders through the popular press, social media, and public events working with collaborating producers.

Research results and discussion:

One of the almond research sites used a more integrated/regenerative orchard production system and was analyzed separately.

A total of 84 soil samples were collected for each of the following: soil nutrient analysis, seed bank study, bulk density, and related properties. All soil samples have been processed for bulk density and related properties (porosity, estimated volumetric water content, estimated water infiltration rate, microbial respiration, and routine nutrient content (N, P, K). Soil organic matter was high in rangelands, then declined in young almond orchards and then peaked in older orchards. SOM was higher in regenerative orchards compared to conventional in both age groups.

The seed bank samples (84) were germinated in a greenhouse from December 2019 until spring 2020. We recorded plant species and numbers, and the approximate timing of plant emergence was recorded. We used this data to calculate Simpson's Diversity Index. Plant diversity was highest on rangelands, followed by regenerative orchards and lowest or conventional orchards. Based on abundance of forage species in each system, regenerative orchards had the  A1. highest nutritional value, followed by rangelands and last conventional orchards.

Insect Diversity Data was collected from Spring 2021 using sticky traps, pitfall traps, and sweep nets- through the end of summer. Insect diversity changes seasonally in the different systems as expected, with diversity 2. picking on rangelands in end of earlier in spring, compared to in orchards. Almond orchards continue to have higher insect population into late spring when rangelands are 3. getting into senescence. At the peaks, regenerative almond orchards had the highest insect diversity.

The landscape hydrology assessment portion of the project started in the fall of 2021. We installed soil sensors for field measurements that will be used to calibrate the models. We are in the process of developing models. This work is continuing into spring 2023.

  1. We 4. perfoormed a literature review to identify the drivers for land use conversion and institutional requirements for the sustainable governance of rangeland systems. Drivers of rangeland conversion included negative public perception about grazing impacts diversity and green house gases (GHG), restrictive public policy on grazing management, improved technology that allows more marginal rangelands to be used for orchard systems, lower economic returns, inheritance issues and rangeland fragmentation. Factors that reduced conversion rates include conservation programs (eg EQIP, Williamson Act, and conservation easements); education programs that emphasizes the benefits of working rangelands to biodiversity and wildlife habitat; Payment for Ecosystem Services (PES) and the establishment of California Conservation Coalition (CRCC). The establishment of the CRCC is an example of adaptive governance that has created a platform for social learning - that promotes the sharing of information about multi-use and benefits of well managed rangelands.

Lab closures due to the COVID-19 pandemic slowed down or completely stopped some soil tests in 2020. Fieldwork was slowed down by the social distancing requirements which limited field crews in 2020. 

 

 

 

Research conclusions:

Preliminary results show higher nutrients, more respiration, plant diversity, and insect diversity in integrated almond orchards and rangelands and less in conventional orchards in general. For insect diversity - we are seeing evidence of seasonal changes in the species and numbers.

Regenerative ag field day

Participation Summary
5 Producers participating in research

Research Outcomes

Recommendations for sustainable agricultural production and future research:

Preliminary results show that regenerative orchard production reduces the long term loss in ecosystem function when land is converted from rangelands to crop production

We found higher insect diversity, plant diversity and soil organic matter in regenerative almond orchards compared to convention almond orchards. The regenerative site included in this research is organic, has plants cover crops (although not ever year) and uses sheep and fire for weed control - our recommendation is for orchard producers to add regenerative management strategies over time to not significantly disrupt production, especially starting with cover crops.

We recommend more peer-to-peer advisory meetings among producers of different commodities to encourage relationship building and developing landscape level management strategies that address complex issues such as sustainability and regional level climate resilience. These relationships could strongly improve regional level implementation of circular production systems, reduce wasted by-products or transportation to other markets, and makes more efficient use of local resources that could improve profitability.

Insect Diversity Data

Sticky Card Trap -Rangeland                
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Cunningham flies(larger) 6 flies(larger) 14 flies(larger) 12 flies(larger) 9  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 1 ladybug 1 ladybug 0 ladybug 1  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 329 thrips 273 thrips 276 thrips 371  
    aphidius colemani 26 aphidius colemani 33 aphidius colemani 22 aphidius colemani 27 parasitic wasp
    aphids   aphids   aphids   aphids   no specific count
    encarsia 4 encarsia 1 encarsia 2 encarsia 4 small parasitic wasp
    beetles 7 beetles 4 beetles 3 beetles 2  
    black rove beetle 23 black rove beetle 39 black rove beetle 25 black rove beetle 22  
    6-spotted thrip 2 6-spotted thrip 10 6-spotted thrip 5 6-spotted thrip 4  
    spiders   spiders   spiders   spiders   no specific count
    aphytis 1 aphytis 0 aphytis 0 aphytis 0 small parasitic wasp
    leafhopper 1 leafhopper 6 leafhopper 3 leafhopper 4  
    stethorus beetle 1 stethorus beetle 7 stethorus beetle 4 stethorus beetle 16  
        bee 1 small black hemiptera 1 small black hemiptera 1  
        small bee 1          
Sticky Card Trap -Rangeland                
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Burroughs flies(larger) 3 flies(larger) 3 flies(larger) 5 flies(larger) 5  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 0 ladybug 0 ladybug 0 ladybug 0  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 406 thrips 343 thrips 276 thrips 361  
    aphidius colemani 1 aphidius colemani 5 aphidius colemani 0 aphidius colemani 2 parasitic wasp
    aphids   aphids   aphids   aphids   no specific count
    encarsia 53 encarsia 176 encarsia 30 encarsia 30 small parasitic wasp
    beetles 5 beetles 5 beetles 2 beetles 11  
    black rove beetle 0 black rove beetle   black rove beetle 1 black rove beetle 2  
    6-spotted thrip 4 6-spotted thrip 0 6-spotted thrip 1 6-spotted thrip 1  
    spiders   spiders   spiders   spiders   no specific count
    aphytis 2 aphytis 2 aphytis 1 aphytis 1 small parasitic wasp
    leafhopper 0 leafhopper 1 leafhopper 4 leafhopper 1  
    stethorus beetle 0 stethorus beetle 0 stethorus beetle 0 stethorus beetle 1  
    ant   false chinch bug 3 lygus 5 lygus 2  
    cranefly   isopod 1     earwig 1  
                false chinch bug 1  
                small bee 2  
Sticky Card Trap -Rangeland                
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Ichord flies(larger) 7 flies(larger) 8 flies(larger) 7 flies(larger) 14  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 0 ladybug 1 ladybug 0 ladybug 0  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 112 thrips 1052 thrips 385 thrips 206  
    aphidius colemani 2 aphidius colemani 1 aphidius colemani 1 aphidius colemani 2 parasitic wasp
    aphids   aphids   aphids   aphids   no specific count
    encarsia 3 encarsia 6 encarsia 3 encarsia 3 small parasitic wasp
    beetles 2 beetles 1 beetles 4 beetles 1  
    black rove beetle 0 black rove beetle 2 black rove beetle 1 black rove beetle 4  
    6-spotted thrip 0 6-spotted thrip 0 6-spotted thrip 0 6-spotted thrip 0  
    spiders   spiders   spiders   spiders   no specific count
    aphytis 0 aphytis 1 aphytis 0 aphytis 0 small parasitic wasp
    leafhopper 3 leafhopper 8 leafhopper 6 leafhopper 26  
    lygus 2 lygus 2 lygus 5 lygus 1  
        ant 1     cranefly 1  
        false chinch bug 1          
Sticky Card Trap - Orchard                  
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Burroughs young flies(larger) 4 flies(larger) 9 flies(larger) 7 flies(larger) 4  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 0 ladybug 0 ladybug 0 ladybug 0  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 323 thrips 77 thrips 124 thrips 48  
    aphidius colemani 15 aphidius colemani 8 aphidius colemani 0 aphidius colemani 3 parasitic wasp
    aphids   aphids   aphids 4 aphids   no specific count
    encarsia 12 encarsia 3 encarsia 6 encarsia 7 small parasitic wasp
    beetles 2 beetles 4 beetles 9 beetles 0  
    black rove beetle 0 black rove beetle 0 black rove beetle 1 black rove beetle 0  
    6-spotted thrip 0 6-spotted thrip 1 6-spotted thrip 0 6-spotted thrip 0  
    spiders   spiders   spiders   spiders   no specific count
    aphytis 0 aphytis 1 aphytis 0 aphytis 0 small parasitic wasp
    leafhopper 2 leafhopper 1 leafhopper 0 leafhopper 0  
    stethorus beetle 0 stethorus beetle 0          
    crane fly 1 crane fly 1          
    small bee 1 ant            
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Burroughs Old flies(larger) 0 flies(larger) 3 flies(larger) 5 flies(larger) 8  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 0 ladybug 0 ladybug 0 ladybug 0  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 182 thrips 342 thrips 49 thrips 126  
    aphidius colemani 1 aphidius colemani   aphidius colemani 8 aphidius colemani 0 parasitic wasp
    aphids   aphids   aphids   aphids   no specific count
    encarsia 82 encarsia 32 encarsia 62 encarsia 41 small parasitic wasp
    beetles 4 beetles 0 beetles 0 beetles 5  
    black rove beetle 3 black rove beetle 1 black rove beetle 0 black rove beetle 2  
    6-spotted thrip 2 6-spotted thrip 0 6-spotted thrip 1 6-spotted thrip 3  
    spiders 1 spiders   spiders   spiders   no specific count
    aphytis 1 aphytis 0 aphytis 4 aphytis 0 small parasitic wasp
    stethorus beetle 1 leafhopper 1 leafhopper 1 cranefly 2  
    small bee 3 small bee 3     small bee 1  
    leafhopper 3              
Sticky Card Trap - Orchard                  
Date Site ID Trap 1 (ID) Trap 1 (Count) Trap 2 (ID) Trap 2 (Count) Trap 3 (ID) Trap 3 (Count) Trap 4 (ID) Trap 4 (Count) Notes
4/20/2021 Chapman flies(larger) 3 flies(larger) 2 flies(larger) 5 flies(larger) 0  
    small flies   small flies   small flies   small flies   no specific count
    ladybug 1 ladybug 0 ladybug 2 ladybug 0  
    gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   gnats(sciaridae)   no specific count
    thrips 282 thrips 441 thrips 329 thrips 280  
    aphidius colemani 7 aphidius colemani 11 aphidius colemani 15 aphidius colemani 13 parasitic wasp
    aphids   aphids   aphids   aphids   no specific count
    encarsia 2 encarsia 22 encarsia 14 encarsia 15 small parasitic wasp
    beetles 1 beetles 4 beetles 9 beetles 0  
    black rove beetle 2 black rove beetle 1 black rove beetle 6 black rove beetle 3  
    6-spotted thrip 0 6-spotted thrip 0 6-spotted thrip 0 6-spotted thrip 0  
    spiders   spiders   spiders   spiders   no specific count
    aphytis 6 aphytis 8 aphytis 7 aphytis 10 small parasitic wasp
    leafhopper 5 leafhopper 3 leafhopper 1 leafhopper 3  
            earwig 3 earwig 1  
            ant        

Vegetation Diversity Data

Plot Species Native/Nonnative Annual/Perennial # of Individuals
Burroughs Young Orchard Juncus bufonius Native Annual  32
  Poa annua Nonnative  Annual  55
  Chenopodium murale Nonnative  Annual  2
  Festuca perennis  Nonnative  Annual/biennial/perennial  6
  Tribulus terrestris  Nonnative  Annual  1
  Avena sp. Nonnative  Annual  1
  Stelleria media Nonnative  Annual  34
  Erodium moschatum  Nonnative  Annual  5
  Capsella bursa-pastoris Nonnative  Annual  17
  Digitaria sanguinalis Nonnative  Annual  4
  Polygonum aviculare Nonnative  Annual/perennial  4
  Hordeum murinum Nonnative  Annual  2
  Amaranthus californicus  Native Annual  2
  Spergularia bocconei  Nonnative  Annual  26
  Cyperus esculentes  Native Perennial  2
  Cerastrium glomeratum Nonnative  Annual  2
  Cynodon dactylon Nonnative  Perennial 39
  Eluesine indica  Nonnative  Annual  2
  Unknown forb 1   Annual  3
  Rumex sp. Nonnative  Annual  1
  Unknown bunchgrass     2
  Trifolium repens  Nonnative  Annual  1
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Burroughs Old Orchard Stelleria media Nonnative Annual 47
  Erodium moschatum  Nonnative Annual 5
  Poa annua Nonnative Annual 235
  Amaranthus californicus  Native Annual 2
  Festuca perennis  Nonnative Annual/biennual/perennial 12
  Juncus bufonius Native Annual 15
  Malva parviflora  Nonnative Annual 1
  Echinochloa crusgalli Nonnative Annual 4
  Convolvulus arvensis Nonnative Perennial 1
  Digitaria sanguinalis Nonnative Annual 3
  Avena spp. Nonnative Annual 2
  Sonchrus oleraceaus Nonnative Annual 1
  Cerastrium glomeratum Nonnative Annual 5
  Cynodon dactylon Nonnative Perennial 1
  Cotula australis  Nonnative Annual 1
  Bromus commutatus  Nonnative Annual 1
  Rotala indica  Nonnative Annual 1
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Burroughs Rangeland Erodium moschatum  Nonnative Annual 9
  Stelleria media Nonnative Annual 16
  Festuca perennis  Nonnative Annual/biennual/perennial 6
  Avena spp. Nonnative Annual 8
  Juncus bufonius Native Annual 44
  Amaranthus californicus  Native Annual 2
  Festuca bromoides  Nonnative Annual 12
  Poa annua Nonnative Annual 1
  Erodium botrys  Nonnative Annual 4
  Bromus commutatus  Nonnative Annual 10
  Rumex sp. Nonnative Annual 3
  Hordeum murinum Nonnative Annual 1
  Unknown brassicaceae 1   Annual 7
  Croton setiger  Native Annual 3
  Galium parisience Nonnative Annual 12
  Dichelostemma sp. Native  Perennial 2
  Cerastrium glomeratum Nonnative Annual 1
  Vicia sp. Nonnative Annual 1
  Unknown chenopodiaceae   Annual 1
  Hypochaeris glabra Nonnative Annual 1
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Angle Orchard (Conventional young) Erodium moschatum  Nonnative Annual 12
  Medicago polymorpha Nonnative Annual 1
  Juncus bufonius Native Annual 92
  Stelleria media Nonnative Annual 12
  Poa annua Nonnative Annual 1
  Cerastrium glomeratum Nonnative Annual 5
  Melilotus indica  Nonnative Annual 1
  Eupohorbia maculata  Nonnative Annual 1
  Unknown forb 2   Annual 3
  Erodium cicutarium Nonnative Annual 1
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Ichord Rangeland Juncus bufonius Native Annual 392
  Erodium botrys  Nonnative Annual 30
  Erodium moschatum  Nonnative Annual 2
  Festuca bromoides  Nonnative Annual 10
  Trifolium repens Nonnative Perennial 12
  Hypochoeris glabra Nonnative Annual 2
  Bromus commutatus  Nonnative Annual 11
  Avena sp. Nonnative Annual 3
  Stelleria media Nonnative Annual 1
  Cerastrium glomeratum Nonnative Annual 1
  Leontodon sp. Nonnative Annual 1
  Unknown forb 2   Annual 5
  Dichelostemma sp.   Perennial 3
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Cunningham Rangeland Erodium botrys  Nonnative Annual 5
  Erodium moschatum  Nonnative Annual 9
  Juncus bufonius Native Annual 61
  Hypochoeris glabra Nonnative Annual 4
  Stelleria media Nonnative Annual 24
  Festuca perrenis Nonnative Annual/biennual/perennial 20
  Poa annua Nonnative Annual 5
  Festuca bromoides  Nonnative Annual 14
  Medicago polymorpha Nonnative Annual 14
  Hordium murinum Nonnative Annual 27
  Avena sp. Nonnative Annual 6
  Bromus commutatus Nonnative Annual 3
  Cerastrium glomeratum Nonnative Annual 1
  Diplacus angustatus Native Annual 1
  Capsella bursa-pastoris  Nonnative Annual 1
  Trifolium repens Nonnative Annual 4
  Dichelostemma sp.   Perennial 1
         
Plot Species Native/Nonnative Annual/Perennial # of Individuals
Chapman Orchard (Conventional Old) Poa annua Nonnative Annual 140
  Cotula australis Nonnative Annual 15
  Stelleria media Nonnative Annual 21
  Erodium moschatum  Nonnative Annual 17
  Festuca perennis Nonnative Annual/biennual/perennial 2
  Euphorbia maculata Nonnative Annual 6
  Echinochloa crusgalii Nonnative Annual 6

SOIL ANALYSIS DATA

Soil Nutrients

Location (Landuse) Sampling Location in Orchard 1:1 Soil pH WDRF Buffer pH 1:1 S Salts mmho/cm Texture No Organic Matter LOI % Soil Organic Carbon % Nitrate-N ppm N lbs N/A Olsen P ppm P Potassium ppm K Sulfate-S ppm S Calcium ppm Ca Magnesium ppm Mg Sodium ppm Na CEC/Sum of Cations me/100g %H Sat %K Sat %Ca Sat %Mg Sat %Na Sat
Angle (Young Orchard) Between Tree Row 6.0 6.8 0.2 2.0 1.7 1.0 20 36 18 190 9 1358 323 26 12 18 4 55 22 1
Angle (Young Orchard) Within Tree Row 6.8 7.1 0.2 2.0 1.5 0.9 6 10 24 185 8 1229 325 115 10 4 5 60 26 5
Burroughs (Range)   6.2 6.8 0.1 2.0 2.0 1.1 12 21 18 176 9 1079 195 10 10 21 5 57 17 0
Cunningham (Range)   6.3 6.9 0.2 2.0 3.4 2.0 12 21 20 268 9 3261 771 31 25 7 3 63 27 1
Burroughs (Young Orchard) Between Tree Row 6.8 7.1 0.4 1.8 1.8 1.0 34 62 70 398 28 1077 158 16 8 2 13 68 16 1
Burroughs (Young Orchard) Within Tree Row 7.2 7.2 0.2 2.0 2.1 1.2 10 18 50 194 50 1343 145 23 9 0 6 79 14 1
Burroughs (Old Orchard) Between Tree Row 7.2 7.2 0.4 2.0 3.7 2.1 26 47 141 453 69 2010 254 28 13 0 9 75 15 1
Burroughs (Old Orchard) Within Tree Row 7.3 7.2 0.3 2.0 2.4 1.4 12 21 66 265 38 1769 264 38 12 0 7 73 19 2
Ichord (Range)   5.7 6.8 0.1 2.0 1.8 1.0 17 31 9 124 7 873 170 13 8 26 4 52 16 1
Chapman (Old Orchard) Between Tree Row 6.8 7.0 0.1 2.0 2.6 1.5 2 4 10 147 9 2215 376 16 15 4 3 73 20 1
Chapman (Old Orchard) Within Tree Row 6.4 7.0 0.1 2.0 2.0 1.2 5 9 9 113 9 1621 439 28 13 7 2 62 28 1

Soil Respiration

Location (Landuse) Sampling Location in Orchard Mineralizable C (mg C kg-1 24h-1)
Angle (Young Orchard) Between Tree Row 80
Angle (Young Orchard) Within Tree Row 44
Burroughs (Young Orchard) Between Tree Row 148
Burroughs (Young Orchard) Within Tree Row 88
Burroughs (Old Orchard) Between Tree Row 126
Burroughs (Old Orchard) Within Tree Row 102
Burroughs (Range)   60
Chapman (Old Orchard) Between Tree Row 65
Chapman (Old Orchard) Within Tree Row 54
Cunningham (Range)   104
Ichord (Range)  

62

 

Soil Physical Characteristics

Location (Landuse) Sampling Location in Orchard Bulk Density (g/cm3) Estimated Water Content (g/g) Porosity Estimated Volumetric Water content (g/cm3) Estimated inches of water/ft soil
Burroughs (Young Orchard) Between Tree Row 1.73 0.02 0.35 0.03 0.39
Burroughs (Young Orchard) Within Tree Row 1.53 0.06 0.42 0.10 1.15
Burroughs (Old Orchard) Between Tree Row 1.68 0.04 0.37 0.07 0.87
Burroughs (Old Orchard) Within Tree Row 1.54 0.09 0.42 0.14 1.70
Burroughs (Range)   1.75 0.02 0.34 0.03 0.33
Angle (Young Orchard) Between Tree Row 1.61 0.15 0.39 0.22 2.69
Angle (Young Orchard) Within Tree Row 1.62 0.13 0.39 0.22 2.59
Cunningham (Range)   1.53 0.19 0.42 0.29 3.48
Ichord (Range)   1.68 0.01 0.37 0.02 0.27
Chapman (Old Orchard) Between Tree Row 1.68 0.19 0.37 0.33 3.91
Chapman (Old Orchard) Within Tree Row 1.62 0.23 0.39 0.37 4.42

 

Our social science component of this work identified the importance of using an Adaptive Governance approach that emphasizes mobilizing and sharing information among diverse audiences to generate awareness and support among stakeholders for conservation across private and public lands. We used the California Conservation Coalition (CRCC) as our case study for this.

ADAPTIVE GOVERNANCE AND THE CALIFORNIA RANGELAND CONSERVATION COALITION (CRCC)

 

HISTORY OF CRCC

Drivers of change

Explanation

Changing societal values

A shift towards negative perceptions about grazing among land managers and environmental groups in the 1980s and 1990s led to policies reducing grazing on public lands (Alvarez 2011)

 

Similarly, changes in community norms and practices away from production and towards amenity enjoyment, as well as increasing trends in amenity migration, reflected in the decline in the number of landowners involved in crop or livestock production and an increase in landowners who primarily managed for amenities (Ferranto et al. 2014)

Perception of ecological crisis

Failures in land management practices led to recognition that the reduction in grazing practices led to an increased spread of nonnative vegetation, as well as loss of native plant and wildlife communities (Alvarez 2011; Huntsinger et al. 2014).

 

Emerging scientific evidence further highlighted the potential role of grazing in enhancing biodiversity conservation (Barry et al. 2007; Alvarez 2011; Huntsinger et al. 2014).

 

Moreover, concerns over grassland conversion and the adverse impact of regulations on ranching highlighted the need for more effective mechanisms for rangelands management (Alvarez 2011).

 

Lack of effective landscape scale conservation mechanisms for vulnerable rangeland ecosystems mostly occurring on fragmented private lands (Alvarez 2011; Huntsinger and Bartolome 2014)

Availability of arena for interaction and formulation of a shared vision

The US Fish and Wildlife Service initiated the process of convening stakeholders at a ranch in the San Francisco Bay Area in 2005. The meeting provided an opportunity for interaction and led to the realization by a diverse stakeholder group, including environmental groups, ranching communities, and government representative at the local, state and federal levels that they share a common aspiration in protecting California’s grasslands as well as the plant and animal communities they support (Barry et al. 2007; Alvarez 2011).

 

Emergence of new institutions

Adoption of the California Rangeland Resolution and the establishment of the California Rangeland Conservation Coalition, with current signatories of more than 100 organizations, based on shared vision and scientific evidence pointing to the importance of landscape history in current management decisions (Barry et al. 2007; Huntsinger and Bartolome 2014).

 

Related initiatives include: the preparation of a map highlighting grasslands to be protected for wildlife and plant conservation; adoption of a strategic plan highlighting mechanisms for mobilizing resources, providing incentives, sharing information, streamlining permitting processes, and filling research gaps; and establishment of the California Rangeland Trust to facilitate conservation easement processes on private lands (Huntsinger et al. 2014).

 

CURRENT STRUCTURE AND FUNCTIONING OF CRCC (Alvarez 2011ab; Barry et al. 2011; Ferranto et al. 2014; Huntsinger and Bartolome 2014; Huntsinger et al. 2014; Huntsinger and Oviedo 2014)

Adaptive governance attributes

Performance of CRCC

 

 

Positive attributes

Potential challenges

Adaptive and integrated management goals

Recognition of rangeland habitat as social-ecological systems that are a product of grazing and other past management practices of ranchers

 

Promotion of rangeland conservation efforts across multiple scales from the ranch and pasture levels to the landscape level

 

Management of rangelands to achieve a variety of goals, including cattle ranching, environmental conservation, provision of ecosystem services, as well as climate change mitigation

Threats to ranching, including low profitability, drought, loss of critical ranching infrastructure, as well as loss and fragmentation of rangelands due to land use conversion

 

Challenges associated with grazing permits, including fear of government restrictions, lack of rancher knowledge on the application process, shortage of available leases, lengthy application procedure, and lack of government and NGO personnel knowledge about grazing

 

Challenges associated with rancher participation in ecosystem service provision, including lack of incentives, and limited rancher familiarity with ecosystem services and payments for ecosystem services

 

Challenge of integrating ranching into other uses in a compatible manner on private and public lands, including the difficulty of finding personnel with skills across the diverse land uses

Diverse knowledge systems

Emphasis of the CRCC on mobilizing and sharing information to generate awareness and support among stakeholders for rangeland conservation across private and public lands

 

Promotion of social learning through yearly summits, workshops and field trips that facilitate interaction and knowledge exchange among researchers, resource management organizations and private ranchers

 

Recognition and utilization of traditional and local knowledge gained from the experience of ranchers by promoting peer-to-peer learning among ranchers

 

Bridging the science-policy gap by bringing ranchers in direct contact with researchers and resource managers

Lack of knowledge about the impacts of grazing

 

Lack of knowledge on the valuation of ecosystem services, as well as high transaction costs associated with the quantification and verification process

 

Potential room for more investment in social science research and mechanisms for integrating local/traditional knowledge in understanding the behavioral and institutional aspects of ranching and rangelands management

Polycentric institutional structure

Promotion of vertical and horizontal interactions among diverse actors (government, private sector, and non-governmental organizations) across federal, state, and local levels to facilitate the implementation of rangeland management practices that also conserve the environment

 

Emphasis on building local capacity for rangeland management through the provision of various forms of support, including education, funding, permit assistance, opportunities for deliberation, and facilitation of ranchers’ participation in conservation easement programs

 

Safeguarding the autonomy and flexibility of ranchers and landowners to make management decisions at the local level in an adaptive fashion in response to the availability of new information

 

Innovative use of incentives and other non-regulatory mechanisms, such as Payment for Ecosystem Services and the role of the California Rangeland Trust, to ensure voluntary compliance of ranchers and other stakeholders with provisions of the California Rangeland Resolution

 

Existence of complex and potentially conflicting regulatory mechanisms among the diverse actors involved in rangelands management across land ownership types

Analytic deliberation process

Emphasis on the facilitation of dialogue and collaboration as mechanisms for reaching common ground among stakeholders

 

Involvement of the general public through workshops and summits with the aim of raising awareness about the ecological benefits of rangelands

Potential room for investment in conflict management mechanisms as part of the functioning of the CRCC

 

Preliminary results from the hydrology section of our work is uploaded in the media library.

 

6 Grants received that built upon this project
18 New working collaborations

Education and Outreach

2 On-farm demonstrations
1 Published press articles, newsletters
5 Webinars / talks / presentations
2 Workshop field days

Participation Summary:

450 Farmers participated
300 Ag professionals participated
Education and outreach methods and analyses:

Mashiri F.E (2022) Quantifying the Effects of Rangeland Conversion on Ecosystem Function: Soil Organic Matter, Plant Diversity, and Insect Diversity. Society for Range Management Conference February 21-25, 2022.

Mashiri F.E (2022) Measuring Ecosystem Function Across Farming Systems: Soil Organic Matter, Plant Diversity, and Insect Diversity. Regenerative Almond Field Day Feb 17, 2022, Regenerative ag field day

Theresa Becchetti and I were interviewed by the Public Policy Institute of California, discussing the associated land-use changes, impacts, and future management strategies. Some of our answers were informed by preliminary results from this ongoing research project- https://www.ppic.org/blog/could-rangeland-return-to-the-central-valley/ - This one is difficult to measure the number of people reached by blog - my LinkedIn post of the blog has 820 impressions.

Mashiri FE. (2023)Rangeland Conversion Drivers and Impacts of Post-Conversion Management Strategies on Landscape Level Ecosystem Health. Society for Rangeland Management February 13-16, 2022

Mashiri F.E (2023) Comparing Ecosystem Function Across Rangelands, Regenerative and Conventional Almonds Orchards: A Landscape Level Evaluation: Regenerative Almond Field Day Feb 22, 2023

Mashiri F. E (2023) Effects of Rangeland Conversion to Regenerative and Conventional Almonds Orchards on Ecosystems Function UC ANR Statewide Conference April 24-26, 2023

 

 

 

 

Education and outreach results:

The two presentations at the 2022 and 2023 Regenerative Agriculture Field day had the most engagement of both producers and researchers with over 300 attendees each year. Presentations at SRM conferences also engaged researchers and producers, about 30 attendees in 2022 and over 60 in 2023 in person. The SRM presentations are also made available online which would have increased the number of people who got access to the information. 

The work has highlighted the importance of multidisciplinary research across different production systems and commodities, to develop best management practices that improve climate resilience, biodiversity and economic returns at landscape level. This work fostered collaboration rather than competition among producers and researchers of different commodities.

200 Farmers intend/plan to change their practice(s)
45 Farmers changed or adopted a practice

Education and Outreach Outcomes

Recommendations for education and outreach:

With increasing acres of crop fields going fallow in California due to water shortages and the SGMA law - follow up research on best land rehabilitation practices, weed control etc

400 Producers reported gaining knowledge, attitude, skills and/or awareness as a result of the project
Non-producer stakeholders reported changes in knowledge, attitudes, skills and/or awareness as a result of project outreach
120 General public
50 Students
200 Ag Service Providers
Key areas taught:
  • Benefits of rangeland for biodiversity
  • Differences between conventional and regenerative agriculture and it's benefits
  • Factors driving convesion of rangeland
  • Benefits of landscape level management for ecosystem funtion, climate relience and economic benefits
Key changes:
  • Regenerative agriculture benefits

  • Benefits if crop-livestock integration

Information Products

    Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture or SARE.