Posts Tagged: agriculture
A recent study led by UC Cooperative Extension specialist Van Butsic used high resolution satellite imagery to conduct a systematic survey of cannabis production and to explore its potential ecological consequences.
Published this spring in Environmental Research Letters, the study focused on the “emerald-triangle” in northern California's Humboldt, Mendocino, and Trinity counties, which many believe is the top cannabis-producing region in the United States.
The UC Berkeley-based Butsic and his co-author Jacob Brenner used Google Earth imagery to locate and map grow sites (both greenhouses and outdoor plots) in 60 watersheds. Most cannabis grow sites are very small, and have gone undetected when researchers used automated remote sensing techniques, which are commonly used to detect larger changes such as deforestation.
“We chose to use fine-grained imagery available in Google Earth and to systematically digitize grows by hand, identifying individual plants. Most plants stand out as neat, clear, little circles,” said Brenner, who is on the faculty of the Department of Environmental Studies and Science at Ithaca College. “The method was laborious — it took over 700 hours — but it proved to be highly accurate.”
Butsic and Brenner paired their image analysis with data on the spatial characteristics of the sites (slope, distance to rivers, distance to roads) and information on steelhead trout and Chinook salmon, both of which are listed as threatened species under the federal Endangered Species Act. These and other species are vulnerable to the low water flows, soil erosion, and chemical contamination that can result from nearby agriculture.
Results of the study show 4,428 grow sites, most of which were located on steep slopes far from developed roads. Because these sites will potentially use significant amounts of water and are near the habitat for threatened species, Butsic and Brenner conclude that there is a high risk of negative ecological consequences.
“The overall footprint of the grows is actually quite small [~2 square kiliometers], and the water use is only equivalent to about 100 acres of almonds,” says Butsic, who is in the Department of Environmental Science, Policy, and Management at Berkeley. According to Butsic, California currently has more than one million irrigated acres of almonds.
He stresses that the issue lies in the placement of the sites: “Close to streams, far from roads, and on steep slopes — cannabis may be a case of the right plant being in the wrong place.”
Last year, California legislature passed laws designed to regulate medical marijuana production, and state voters will weigh in on whether to legalize recreational marijuana this coming fall. Given these changes as well as the profitability of cannabis production, Butsic expects that marijuana cultivation will expand into other sites with suitable growing conditions throughout the region. He and Brenner assert that ecological monitoring of these hotspots should be a top priority.
Bills recently signed into law by Governor Jerry Brown have made some advances in this direction — requiring municipalities to develop land use ordinances for cannabis production, forcing growers to obtain permits for water diversions, and requiring a system to track cannabis from when it is first planted until it reaches consumers.
But the researchers say that regulation will likely be a constant challenge because it will rely on monitoring procedures that are just now emerging, as well as voluntary registration from producers and budget allocation from the state for oversight and enforcement.
“Some of the same fundamental challenges that face researchers face regulators as well, primarily that cannabis agriculture remains a semi-clandestine activity,” says Brenner. “It has a legacy of lurking in the shadows. We just don't know — and can't know — where every grow exists or whether every grower is complying with new regulations.”
California water: Few natural resources are as impressive, or as imperiled. Whether it's supplying 40 million domestic users, cooling the server farms of Silicon Valley, or irrigating the actual farms that supply half of the nation's produce, the importance of the state's aquifers and headwaters cannot be overstated. (Lake Tahoe, Yosemite Falls, and white-water rafting on the Kern and American Rivers feel like an embarrassment of riches.) While the potential for a multi-decade drought has grabbed headlines, however, California's water supply faces assault from a host of lesser-known factors including infrastructure failure, pollution, habitat loss, and plain old political chaos. This issue is strongly interdisciplinary, so it's only natural that UC Berkeley College of Natural Resources professors and students have been at the forefront of analyzing the problems and beginning the search for solutions. Several Berkeley professors have even served on the Delta Independent Science Board (DISB), a group of experts appointed by the state to oversee the quality of scientific research on California's contentious delta water issues.
Supply vs. demand
“Issue number one, one, and one is that a substantial portion of the acreage in agriculture is supported through groundwater overdraft, even in normal-rainfall years,” he says.
According to the U.S. Geological Survey, California's cities, factories, and farms soak up about 38 billion gallons every day. And while most people think of water in terms of rivers, lakes, and rain, over a third of the state's supply comes from aquifers deep underground. Only one in six Californians relies on groundwater alone to supply their domestic needs.
“We've been mining water to expand use beyond surface-water allocations,” says Norgaard. “Groundwater is close to gone, and agriculture is saying, ‘Where's our water, where's our water, where's our water?'”
Given that much of California is a desert — and that decades-long droughts are not impossible — intelligently managing California's limited supply is crucial. Gov. Jerry Brown recently ordered municipalities to cut home water usage by a whopping 25 percent, and California residents gave themselves a well-deserved pat on the back when usage for July 2015 surpassed that target by 6 percent. But there's one problem: Domestic use accounts for only 10 percent of California's total water consumption. Agricultural use, on the other hand, accounts for closer to 40 percent.
At first glance, that doesn't seem entirely inappropriate. Fruits, vegetables, and nuts, not to mention Northern California's incomparable wine and cheese — why shouldn't the farmers who feed half of the nation take half of the water that the state has to offer?
“Do you know what percent of the state's economy is agriculture?” asks Vincent Resh, a professor in the Department of Environmental Science, Policy, and Management (ESPM) and another DISB member. “Less than 2 percent.” It's a very vocal 2 percent, though, and there are volumes of case law — and a good amount of political muscle — dedicated to maintaining the status quo. “I'm very sympathetic toward the plight of farmers in the delta,” Resh continues. And farmworkers are the poorest of California's poor, with seasonal unemployment rates reaching upwards of 60 percent. “It's the human side of the story that I've become extremely sensitive about.”
Nonetheless, Resh recalls being on a delta tour that was packed with people who identified themselves as delta farmers.
“They were all talking about how this has been their family heritage for generations, but they were working as lawyers and bankers," Resh said. "They were really talking about a way of life that was long gone for them personally, but a memory that they were holding on to. Actually, this ‘way of life' idea is true of many of the contentious water issues in California. The controversies over who gets the water in the Klamath River in Northern California and Oregon are as much about way of life as they are about water for agriculture and salmon.”
A fragile water system
Nobody is suggesting an outright end to farming in California, but it's becoming increasingly clear that change is coming. One looming problem is the fragility of the levee system. Drive around Sacramento's rural environs and you'll realize that a lot of farmers actually do their work below sea level, with nothing but a hodgepodge system of peat dams and concrete rubble to restrain the brackish delta waters. Overactive beavers, like the one on the Jones Tract, are the least of the problem.
Like everyone else in California, the engineers who watch over the delta's levee system are at the mercy of probability, breathing a sigh of relief every day that goes by without the catastrophic shaking of the Big One.
“In any given year, there's not a large chance of a huge earthquake,” says David Sunding, UC Agriculture and Natural Resources Cooperative Extension specialist and chair of the UC Berkeley Department of Agricultural and Resource Economics. “But those risks accumulate over time. And by the time you look two decades into the future, there's a two-thirds chance of a very large quake that will affect the delta's water system.”
Even an apparent bounty — consecutive years of high rainfall — poses risks. River flows would rise along with reservoir levels, placing added stress on levees so that even a minor structural failure could set off a chain reaction, flooding fields and devastating crops.
“The current proposals for achieving reliable water supply and ecosystem health may be controversial, but it's clear that something has to be done — we can't have the status quo.”
— Vincent Resh
Inherent in either of these scenarios is the threat to drinking water. The delta houses the State Water Project, two massive pumps that send water to Southern California. If the levees are overtopped, the salt water of the bay will infiltrate the Sacramento and San Joaquin rivers, rendering the supply undrinkable.
“The worst-case scenario is three months without water,” Resh said. “And that's from Fremont down. Silicon Valley, Los Angeles, everything.”
Not just a human problem
Of course, farmers and thirsty urbanites aren't the only ones who need water. According to Berkeley Environmental Science, Policy, and Management associate professor Stephanie Carlson, “many of California's native fishes are declining, and the causes are rooted in habitat loss and the introduction of non-native fishes into California's waterways.” She emphasizes that our current multiyear drought may be the “nail in the coffin” for those populations already facing extinction.
Carlson's research focuses on understanding where and why fish populations are persisting. She found that several native fish, including commercially harvested salmon, live in “intermittent streams” — waterways that flow continuously in the wintertime but break into isolated pools during periods of low rainfall. As drought or human usage reduces stream flow, water quality deteriorates, resulting in higher temperatures and less oxygen. In pools that dry up completely, all fish die, of course, but some “refuge” pools persist through the summer — and these habitats do support fish.
Carlson's team has found that “the survival of imperiled salmon and trout varies among summers, but is highest after wet winters.” Following wet winters, streams flow longer into the summer, more pools persist, and water quality is improved. But, interestingly, “almost regardless of winter rainfall, most fish mortality is concentrated in late summer,” meaning that early, abundant fall rains may be as important as the previous winter's storms.
Carlson believes that these findings should guide management. Urban development in the Bay Area is spreading from flatlands to the hills.
“We need to focus our conservation efforts in those upper headwater streams — many of which are intermittent,” she says. Carlson also stresses that native fish have adapted to the seasonal shift from flowing streams to standing pools, while non-native fish have not — thus intermittent headwater streams may be important refuges for native fishes.
While diverting less water from streams during summer might help juvenile salmon, managing outcomes in the ocean is far more difficult. In 2007 and 2008, the West Coast Chinook salmon population collapsed, with the Sacramento River fall run reduced by 90 percent. Fisheries closed at a cost of millions of dollars, and the federal government declared a disaster. While the crisis was attributed to low ocean productivity beyond human control, human degradation of freshwater salmon habitats worsened the impact of poor ocean conditions.
Most salmon-breeding habitats in the Central Valley lie upstream of dams. Today, most Central Valley salmon are born in hatcheries; many circumnavigate the delta in trucks and are released into the San Francisco Bay. Because these fish don't swim through their natal rivers and the delta, they have no way to retrace their paths as adults. So they go everywhere, mingling with the broader gene pool. This “straying” erodes genetic differences among populations and increases the risk of collapse. It's possible that a more vibrant, genetically diverse salmon population could have better resisted the environmental disturbances of the mid-2000s.
“It's like having a broad portfolio of financial investments, as we've been taught with our 401(k)s,” Carlson says. “Maintaining multiple distinct populations with diverse traits and dynamics provides insurance against environmental change.”
—Excerpted from an article in the winter 2016 issue of Breakthroughs Magazine. Read the complete article.
UC Agriculture and Natural Resources (UC ANR) advisor is among the scientists who contributed to the rangeland issue of the children's magazine.
Jr. Animal Scientist is published by the American Society of Animal Science for children aged 5 to 12 who are interested in animals. For the September 2015 issue, members of the Society for Range Management collaborated with ASAS to provide photos and facts about rangeland.
Theresa Becchetti, UC ANR Cooperative Extension livestock and natural resource advisor for Stanislaus and San Joaquin counties, and Lisa Page, from the University of Arizona, served as co-editors for the special issue.
“Our goal is to have kids and their parents and teachers learn the value of rangelands, beyond being used to produce beef and lamb; they also provide habitat for wildlife,” said Becchetti. “Rangelands can produce energy – solar, wind and oil – while providing clean water and air and a place for recreation. These resources are protected by ranching families, the stewards who make their homes on rangeland.”
“As a member of the Society for Range Management, and working on developing curriculum on rangelands in California, I was excited to be involved in the effort,” Becchetti said. “The magazine has a national circulation with a mix of families and schools.”
A PDF of the Jr. Animal Scientist rangeland issue can be viewed at http://ucanr.edu/sites/news/files/220859.pdf.
April's Global Food Systems Forum invigorated the conversation. The event convened some of agriculture's leading experts to address the plethora of challenges that face our global food systems. The conversation brought forward several hot topics: GMOs, large scale vs. small scale production, nutrition and more.
But even with the riveting debate, the question remains: What is sustainability? Is it focusing more on natural ecosystems? Is it being completely self-reliant, or turning only to organics? Is it focusing on a larger multi-national scale?
UC ANR has started holding a series of sustainability webinars to continue the conversation and tackle some of these questions. The first webinar took place on Feb. 15, 2013 with Tom Tomich, director of the UC Agricultural Sustainability Institute. The webinar tackled the issue of sustainability: What is it? Is there a sustainability science? What is at stake? The video can be seen on the ASI website.
The second webinar, on May 31, 2013 with Neil McRoberts, professor in the Department of Plant Pathology at UC Davis, focused on linking sustainability theory with practice. McRoberts addressed sustainability theory using formal models to plan and track extension outreach efforts, and linking interdisciplinary scientists. Though the webinar is not yet available online, it will be soon on the ASI website.
The next webinar is Thursday, June 13, from 10:00 a.m. to 12:00 p.m. Featuring Ermias Kebreab, professor in the Department of Animal Science at UC Davis, the webinar centers on environmental sustainability of animal agriculture. Topics will include: sustainability as a "wicked" problem, water quality and livestock production, and the mitigation of air emissions from livestock operations. The webinar is free and open to the public. More information is available on the Agricultural Sustainability Institute website.
Sustainability is a complex issue. These questions about the definition and concept are not going to be answered overnight. But as long as these types of conversations and learning opportunities continue to take place, I'm confident we'll continue adapting and meeting the complex challenges with which we are faced.
As drought dries the landscape and rising global temperatures make for decreasing crop yields, farmers are faced with the question of how to feed billions of people in a way that both reduces global greenhouse gas emissions and adapts to the realities of climate change.
Scientists and policymakers from around the world will gather today through Friday, March 20-22, at the University of California, Davis, to grapple with the threats of climate change for global agriculture and recommend science-based actions to slow its effects while meeting the world's need for food, livelihood and sustainability.
The Climate-Smart Agriculture Global Science Conference, planned in coordination with the World Bank, builds on a 2011 international meeting on this theme in the Netherlands.
"Climate change, which brings severe weather events and more subtle but equally menacing temperature changes, presents unprecedented challenges to the global community," said UC Davis Chancellor Linda P.B. Katehi.
"In California, where we rely heavily on snowmelt for irrigation to grow half of our nation's fruit and vegetables, we are acutely aware that scientists and policymakers must join forces to lessen the potential effects of climate change," she said.
Katehi will open the conference on Wednesday, March 20, along with Thomas Vilsack, secretary of the U.S. Department of Agriculture (via video). The public is invited to attend the opening day’s program (8:45 a.m.-12:30 p.m), free of charge; and the closing day’s afternoon program (noon-3:45 p.m.), also free of charge. These will be held in Jackson Hall of the Mondavi Center for the Performing Arts. (Lunches not included.)
Catherine Woteki, USDA undersecretary, will speak Thursday evening, March 21.
Other speakers will include: Ben Santer, climate researcher at Lawrence Livermore National Laboratory and a member of the National Academy of Sciences; Joseph Alcamo, chief scientist for the United Nations Environmental Program; and Patrick Caron, general director for research and strategy of the French Agricultural Research Center for International Development. Also speaking will be outstanding scientists from dozens of universities and research institutes from around the world.
Conference topics will focus on the implications of cutting-edge agricultural, ecological and environmental research for improved design of policies and actions affecting agricultural management and development; identifying farm and food-system issues, determining research gaps; highlighting emerging research initiatives; and developing transformative policies and institutions.
The conference will conclude with participants developing and endorsing a declaration regarding the key research and policy messages that result from conference presentations and discussions. This declaration is expected to point toward science-based policies and actions for global agriculture that will mitigate climate change and encourage adaptation to maintain food security, livelihoods and biodiversity.