Posts Tagged: Hopland

Lambs grazing on pastures after wildfire show no significant adverse effects

Hopland REC turns 2018 River Fire devastation into research opportunity

Ewes and lambs graze in February 2021 on a Hopland Research and Extension Center pasture that was burned in the 2018 River Fire. UC Davis researchers analyzed meat, wool, soil, plant and water samples to assess the risk of metal contamination in sheep grazed on recently burned pasture regrowth. Photo: Valerie Eviner.

The destructiveness of wildfire flames is easy to see, but dangers may lurk in the ashes they leave behind. A group of UC Davis scientists studied lambs at the UC Hopland Research and Extension Center, investigating whether pastures regrown after a wildfire cause toxic metal residues in grazing animals. The results, published in California Agriculture journal, showed that grazing on regrown pastures did not significantly alter the metal content of the lambs' meat and wool. That's good news for ranchers and consumers from a food safety perspective.

In 2018, the River Fire burned six miles north of Hopland, scorching two-thirds of the land at Hopland REC, including areas in its sheep station. Since Hopland REC conducts ecological and agricultural research, they had data and some meat samples from the sheep flock that lived on site before the River Fire occurred. 

“A bunch of researchers came together to brainstorm how we could take advantage of this unfortunate event,” said Sarah Depenbrock, assistant professor and agronomist in the Medicine and Epidemiology department of UC Davis School of Veterinary Medicine.

Burning has played a role in agricultural processes for many years, but wildfires in California are creating a new fire landscape that interests researchers like Depenbrock. “The problem, now, is that these big wildfires probably interact with agricultural land differently than routine prescribed burns,” she said.

Large, older plants on lands that have not recently burned may contain high concentrations of metals, sequestered over years of growth. Mercury is an example of a potentially dangerous metal that can be sequestered in living things over time. These metals may be distributed in ash after the vegetation burns so the scientists examined lambs that had grazed on Hopland REC's recently burned pastures, during the first plant regrowth.

The researchers compared meat from lambs that grazed on regrown pastures in 2019, after the River Fire, to frozen meat samples that were collected the year before the fire. Lead, mercury, arsenic, molybdenum, cadmium, beryllium, cobalt and nickel were not detected in any animal samples. There were, however, a few (3 out of 26) samples that tested positive for the non-essential (potentially toxic heavy metals) chromium and thallium in the group grazing after the fire.

Due to the small number of samples testing positive, researchers could not determine statistically if this contamination was associated with grazing the burn regrowth. The concentrations of chromium and thallium found may or may not be potentially toxic, depending on the specific forms and how much meat a person consumes.

A view of Hopland Research and Extension Center in October 2018, after the River Fire, before pasture regrowth. Photo by Jennie Lane.

Another aspect of the study included testing lambs' wool to determine if it is a good method of judging the mineral content of its meat. “In general, we learned that it wasn't well-correlated with most meat metal content of interest, which is worth knowing. However, because we did not identify many of the non-essential metals of particular toxologic concern, such as lead or mercury, in any animal samples we could not determine if testing wool would be useful for those metals, as they are in other species,” said Depenbrock. She also notes that the wool from animals whose meat tested positive for chromium and thallium, did not test positive for these metals in their wool.

As the challenges in managing wildfires persist, so does the risk of contamination of food products stemming from grazing livestock.

“We didn't get striking evidence that tells us, when there's a fire, it means everything is contaminated with heavy metals,” said Depenbrock. “But it does raise the question that maybe we should be doing a little bit of surveillance to see if this is spurious or common. And we should be finding a way to screen grazing herds.”

Recommendations to manage copper concerns

“It's a very small study, but it was quite interesting to find that copper was actually lower in the postfire grazing group, which makes me wonder,” Depenbrock said.

Diseases associated with copper deficiency are a major concern in sheep. For example, congenital swayback can result in stillbirth or an animal's inability to stand on its own due to incurable changes to the spinal cord. Other adverse effects include reduced growth rate, anemia, wool defects and fiber depigmentation, and osteoporosis with higher risk of spontaneous fractures. Copper excess can also cause serious and sometimes fatal disease.

Many of the forage sources, grazing areas and rangelands in California are copper deficient, while some feed sources have excess copper. Screening and monitoring livestock herds for trace minerals including copper is crucial.

To test for copper, she advises livestock owners to obtain mineral concentrations from the organs of euthanized or dead animals. Samples from the liver and kidney are the most valuable organs to identify a potential problem in the herd. UC Davis Veterinary Medicine's California Animal Health and Food Safety (CAHFS) labs do this testing routinely.

Second, monitor and record mineral supplementation and, third, maintain updated health records to make informed decisions regarding supplementation based on a herd or flock's known problems. For example, if a producer is not accustomed to supplementing copper, Depenbrock highly recommends working with a veterinarian to start out (as there are numerous copper supplement products of varying concentration on the market), to determine a testing or screening plan, and review health records for problems potentially associated with copper.

To read the full text of the study, visit https://calag.ucanr.edu/Archive/?article=ca.2022a0016.

Burn regrowth at the Hopland Research and Extension Center, December 2018. Researchers did not detect lead, mercury, arsenic, molybdenum, cadmium, beryllium, cobalt or nickel above reporting limits in any meat or wool samples. Photo by Sarah Depenbrock.

Tribal Engagement at the Hopland Research and Extension Center

UC ANR staff and academics at the Hopland Research and Extension Center are working to build relationships with neighboring Hopland Band of Pomo Indians. Photo courtesy of Hopland Band of Pomo Indians Environmental Protection Department

The Hopland Research and Extension Center is situated on the traditional, ancestral and unceded lands of the Shóqowa and Hopland People, whose historical and spiritual relationship with these lands continues to this day and beyond (for more on the Land and people history of the site, see this story map). It was, and continues to be, difficult for Indigenous people to thrive in the Shanél Valley after they were forced off the fertile land and had to resettle on relatively small upland parcels and away from freshwater sources. UC ANR staff and academics at the Hopland Research and Extension Center are working to build relationships with the Hopland Band of Pomo Indians who live and work next door at the Hopland and Nacomis Rancherias.

Hopland REC Director John Bailey is committed to building relationships with the intention of enabling maximum benefits for local tribal communities. Tribal Chairperson Sonny Elliot and the Council have been helping us find ways to collaborate after a long history of distrust and despite the University's founding using the sales of expropriated lands (Land-Grant College Act, 1862) and our continued occupation of California Indian territories. Bailey is working with local tribes to define a newly funded Academic Advisor position to build relationships, advance UC policy around working with Tribes, and restore good fire to the landscape with the help of cultural practitioners. 

We have secured funding to hire a Native college student to help revitalize ecocultural wetlands in Hopland this summer. The intern will spend time talking with Indigenous people living within the oak woodland landscape or North Coast California and develop a plan for stewarding ecoculturally important sites at the Hopland Research and Extension Center with the Hopland Band of Pomo Indians and local experts in traditional ecological knowledge. This internship offers an opportunity for a Native American college student or two to learn about wetland systems and traditional ecological knowledge; and share their experience with other tribal community members.

Hunting opportunities for Tribal youth and their families and plant collection sites for basket materials are available. The hope is that more cultural ceremonies can take place where generations of Pomo people spent time near the waterways that span Hopland REC. Finally, together we are exploring ways to modify access of existing roads at Hopland REC to allow for potential emergency evacuation for Rancheria residents.

More to come, we hope.

New wave of California Naturalists emerge from course at Hopland REC

California Naturalist classes include many hours of outdoor exploration and learning.

Thirty-eight young, budding naturalists sit in a meadow while journaling and sketching their observations of the wildflowers and birds around them. They have come from various educational backgrounds to gather at the University of California Agriculture and Natural Resources' Hopland Research and Extension Center (REC) to learn about local natural ecosystems through a California Naturalist course.

Although they vary in expertise, these students share a common motivation: immerse themselves in the natural world and eventually teach others about its importance.

“The class really changed the way I view the world around me,” said Will Zuniga, a recent class participant at Hopland REC. “Now that I've taken it, I don't just see plants around me – I see stories. I understand more about the relationship that all of nature's moving parts have with each other. The class has given me more drive to learn about the world around me and to teach others as well.”

Under the UC ANR umbrella, the California Naturalist Program certifies participants through an immersive 40+ hour class delivered by one of its partner organizations, in this case, the California Conservation Corps (CCC). Aged 18 to 25 (and U.S. military veterans up to age 29) and from diverse educational backgrounds across the state, these California Naturalist students worked hard to fulfill the mission of the CCC – to protect and enhance California's natural resources and communities through education and service. 

The California Naturalist Program promotes environmental literacy and stewardship through discovery and action. The program is designed to introduce Californians to the wonders of our unique ecology, engage the public in the study and stewardship of California's natural communities, and increase community and ecosystem resilience. Many other states have similar naturalist programs, but this is the first statewide program in California.

“California Naturalist training allows people of different backgrounds to come together to set what is the standard for how we talk about the sky, the ground below us, and the water that's flowing around us,” reflected Jacob Croasdale, a former class participant. “[They teach us] how to engage respectfully in a way that allows us to both receive and give back to nature.”

Although students graduate with broad knowledge of California's natural wonders, prior knowledge of the course's subject matter is unnecessary. “At first, I thought…I don't belong here. I'm just this artist - what do I have to offer?” shared Monique Wales, another former class participant. “There were Master Gardeners, geologists, biologists and people with crazy amounts of knowledge. But we all came together with such enthusiasm, and we wanted to learn from each other. It was such a fun group.”

“People who are thinking about the California Naturalist program but aren't sure that they know enough to step into something where the language is maybe more technical than they're familiar with should not be intimidated,” added Pete Devine, resident naturalist at Yosemite Conservancy. “A lot of participants are beginners and just generally interested folks. These people belong in the California Naturalist Program.”

A quick peek at the syllabus reveals many themes, field trips and interactions with local experts that culminate in the well-rounded knowledge necessary to help preserve our unique ecosystems. California has an incredibly diverse range of wildlife, habitats, rivers, lakes and coastal resources – wild and urban alike – and ecosystem and community resilience are essential.

After the course is completed, California Naturalists perform service through education and interpretation, stewardship, participatory science, environmental program support, community resilience and environmental justice. To date, certified California Naturalists, together with Climate Stewards (another component of the program), have volunteered more than 250,000 hours, worth over $7 million, in 52 of 58 counties in California.

The relationship between CCC and California Naturalist was piloted at the Hopland REC over the last two years and is now being rolled out across the state with support from the Prop 64 Youth Community Access fund. Overall, the project aims to offer three California Naturalist instructor trainings for 48 youth leaders, 24 California Naturalist certification courses for 480 Corps members, visits to or engagement with over 40 unique cultural and natural resources around the state each year, and 3,840 hours of service-learning outreach through youth-led video capstone projects promoting natural and cultural resources.

Overall (and most importantly), the California Naturalist Program allows corps members to have a solid connection to the “why” of their hard work.

Perhaps if we can all connect a bit more with nature in our backyard, we too will see the stories hidden in the plants, water, animals and land.

Participants in the California Naturalist program gain deep insights into the state's diverse ecosystems.

Hopland Research and Extension Center's land and cultural history

First Hopland Indian Rancheria. Photo courtesy of Mendocino County Historical Society

Field research in agricultural and natural resource science has been ongoing at UCANR Research and Extension Centers for over 70 years, making an impact on the food we eat and the management practices we recommend. What afforded us the opportunity to have these living laboratories? The University of California is a land grant institution and is directly linked with the federal Morrill Act of 1862, also known as the Land-Grant College Act. The Act granted land mostly taken from indigenous tribes to states that used the proceeds from the sale of these lands to fund colleges specializing in agriculture and the mechanical arts. 

A recent article in High Country News, "Land-Grab Universities," provides interactive spatial data revealing the direct connection between the ~10.7 million acres of stolen Indigenous land and land-grant institutions. Many of these Morrill Act parcels were in California and, thanks to Andy Lyons at UCANR IGIS, we can view the overlap between UC land and these parcels in a geographic information system.

We created an ESRI Story Map to provide a synoptic history of the land that Hopland Research and Extension Center (HREC) currently occupies before it became part of the University of California. The map is the result of a collaborative effort that included the UC ANR Native American Community Partnerships Work Group, the Tribal Historic Preservation Officer for the Hopland Band of Pomo Indians, HREC staff, local long-time residents, and UC ANR IGIS. Our hope is that educators, researchers, landowners and other Hopland community members will learn about the historical context of the area, including injustices Indigenous people endured, and develop a sense of appreciation and admiration for the land we study. 

This story map builds on an acknowledgment of the Shóqowa and Hopland People on whose traditional, ancestral and unceded lands we work, educate and learn, and whose historical and spiritual relationship with these lands continues to this day. It contains some details on the Indigenous history, a brief history of the Spanish/Mexican land grant and other facts from the early colonial period, a timeline of notable events, and ways HREC and neighboring Indigenous communities are collaborating to foster a sincere and mutually beneficial relationship for the land and the community. Please explore HREC's land history story map and if you are interested in building your own see our methods in the reference section.

UC Cooperative Extension to investigate healthy soil practices with CDFA grants

Six UC Cooperative Extension research projects were awarded funding ranging from $100,000 to $250,000 each from the California Department of Food and Agriculture Healthy Soils Program. The grants are designed to fund implementation and demonstration of on-farm soil health practices that reduce greenhouse gas emissions and store carbon.

One of the grant recipients, John Bailey, director of the UC Hopland Research and Extension Center in Mendocino County, will use the $100,000 award to establish a perennial hedgerow at the center. Hedgerows are not traditionally part of standard ranching practices in Mendocino County, where in the past the center's 5,400 acres of rangeland and surrounding areas were grazed by large flocks of sheep.

“At Hopland, we have pivoted our operation to reflect the current state of the sheep industry in California, with reduced overall sheep numbers and decreased individual flock size, so we will use this project to show our smaller-scale sheep owners how they can enhance the ecosystems of their properties,” Bailey said.

Bailey expects the hedgerow to offer many educational, ecological and practical benefits, including enhancing soil health, increasing soil carbon sequestration, and providing habitat and food sources for beneficial organisms, such as pollinators and birds.

There may also be economic benefits to using sustainable practices in raising sheep. The project will explore the financial costs of implementing hedgerows as well as the opportunity for producers to enter a niche fiber market by offering sustainably produced wool to textile companies and consumers willing to pay a premium to support the ecological benefits of Healthy Soil Projects.

“I'm excited about this opportunity to combine the latest knowledge on environmental sustainability practices with the older traditions of livestock grazing in Northern California,” Bailey said. “This is a progressive step that ties in ecological knowledge that can benefit the livestock ranching model by both enhancing their properties and creating new markets for their products.”

CDFA will provide funding for six UC Cooperative Extension projects that will demonstrate soil health practices on California farms and ranches.

The following projects were also funded by CDFA Healthy Soils Program in 2020:

Integrated sustainable nitrogen management in vegetable cropping systems, $250,000
Maria de la Fuente, UCCE county director and advisor, Monterey and Santa Cruz counties

The implementation of climate-smart agricultural practices within intensively managed vegetable cropping systems is extraordinarily challenging. Often conservation practices cannot be effectively implemented due to operational barriers, resulting in very low rates of adoption.

By demonstrating nutrient management strategies in partnership with a large influential vegetable grower in the Salinas Valley, the project aims to encourage broad scale practice adoption.

Recent research has indicated the addition of organic amendments in combination with nitrogen fertilizers potentially reduces nitrogen-derived greenhouse gas emissions and nitrate leaching while increasing soil carbon stocks. These outcomes will generate significant climate benefits in agroecosystems experiencing heavy tillage and fertilizer inputs.

This project has the potential for statewide impact as the researchers are currently working with the developers of COMET-Farm to provide data and coordinate outreach within vegetable cropping systems. Through direct engagement the team will make integrated sustainable nitrogen management more feasible and agronomically favorable for producers.

Using hands-on COMET-Farm-focused field days and a webcasted sustainable nitrogen short course, the project will provide producers with additional tools to make nutrient management planning decisions that have positive climate and soil health outcomes.

Evaluation of compost application to processing tomato fields in the Sacramento Valley, $100,000
Amber Vinchesi-Vahl, UCCE vegetable crops advisor, Colusa, Sutter and Yuba counties

The project will demonstrate compost applications on two farms in two Sacramento Valley counties, Colusa and Sutter. The researchers will work with Westside Spreading LLC and compare two plant-based compost rates to a control (no compost) over three years. Soil health parameters – such as total carbon and nitrogen, pH, EC, organic matter and fertility analyses relevant to tomato crop production – will be measured. 

The benefits of compost applications vary depending on how often they are used, how much is applied, crop rotation, and other management decisions, such as whether compost is incorporated or left on the soil surface. Vinchesi-Vahl expects that over time the compost implementation evaluated in this project will result in lower input costs and improved soil function.

Compost application may reduce the need for fertilizer inputs for some of the rotational crops and provide benefits to the microbial community, thereby improving soil structure and reducing heavy conventional tillage needs.

By improving soil health, the research expects plant health will also be improved, leading to better tolerance to pest pressure from diseases and weed competition.

The two demonstration sites will showcase compost applications and their impact on processing tomato production and annual production soil health. These focused demonstrations will be extremely important in showcasing this soil health practice in the local Sacramento Valley region, providing information to growers from the experiences of collaborators at the two sites.  

Evaluation of winter cover crop species for their ability to mitigate soil compaction in an annual rotation, $100,000
Sara Light, UCCE agronomy advisor, Sutter, Yuba and Colusa counties

This project has three components:

• Replicated research plots in which three cover crop varieties are evaluated for improvements in soil structure, specifically subsurface soil compaction
• Fieldscale demonstration plots in which varieties thought to reduce soil compaction are planted and visually assessed for performance in the Sacramento Valley
• Small, single-row hand planted plots in the buffer area, in which a wider number of both summer and winter cover crop varieties will be planted for outreach and demonstration purposes

Combined, these components will enable growers to make more informed decisions about cover crop selection and encourage wider adoption of cover cropping. The outreach objective for this project is to reduce barriers to cover crop adaption among regional growers by increasing knowledge and information about varietal selection and field-scale cover crop management, as well as opportunities to improve soil structure using cover crops.

Healthy soils demonstration project with Cardoza Farm, $100,000
Ruth Dahlquist-Willard, UCCE small farms advisor, Fresno and Tulare counties

This project will demonstrate compost application, hedgerow planting, and application of mulch generated from cover crop residue in a vineyard producing organic raisin grapes. Mulch will be applied directly under the vines, providing ground cover that will conserve soil moisture and decrease weed pressure. Generating the mulch on-farm eliminates the need to transport materials from outside sources.

Currently, production of organic raisin grapes involves frequent tillage under the vines. The cover crop between rows and the mulch under the vines will reduce the need for tillage for weed control and increase soil organic matter. These practices will be showcased at field days that will include bilingual training for small-scale, socially disadvantaged farmers in the San Joaquin Valley.

Application of compost to alfalfa to improve soil structure and fertility, $250,000
Kate Scow and Radomir Schmidt, UC Davis Department Land, Air, Water Resources and UCCE advisors Michelle Leinfelder-Miles and Rachael Long

This project will demonstrate compost application to alfalfa for improving soil structure and fertility. Compost is not typically applied to alfalfa; however, manure application to alfalfa is common in the state's dairy regions.

The over half a million acres of alfalfa in California could represent an important repository for compost, for which a large land base of spreading may be needed as municipalities convert organic waste management streams to diversion from landfills.

Alfalfa has the ability to immobilize large amounts of nitrogen and phosphorus, nutrients of concern in the concentration of organic wastes due to their potential to contribute to water pollution. Furthermore, alfalfa growers are interested in the potential of compost to improve soil structure in their alfalfa fields, as many growers report suffering from the large cracks that form in soils during the wet-dry cycles of alfalfa surface irrigation management.

Compost application has been anecdotally reported to alleviate soil cracking in another perennial crop, almond orchards in the Central Valley, but soil structure improvement via management practices like compost application has received little research attention thus far. Westside Spreading LLC is collaborating on this project.

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