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Cooperative Extension San Joaquin County

Posts Tagged: agriculture

California’s delta: On the front lines of the state’s water issues

Stephanie Carlson researches native California fish populations in "intermittent streams" in the Sacramento-San Joaquin Delta. Photo: Edward Caldwell.
On June 3, 2004, a small trickle of water started to flow through a levee on the Jones Tract, a patch of farmland west of Stockton that sits below sea level. Of California's 27 million acres of irrigated croplands, the tract's 12,000 acres weren't exactly at the forefront of anyone's mind. But within a few hours the rivulet had become a deluge, opening a 350-foot-long gash in the wall that was built to hold back the waters of the Sacramento–San Joaquin Delta. The land quickly became a lake, submerging asparagus fields, corn silos, and dozens of homes beneath 60 million gallons of water. Repairing the break required six months of constant pumping and cost approximately $100 million; farmers throughout the Central Valley, who depend on the delta's 1,100-mile-long network of levees, had a new reason to lose sleep at night. The cause of the initial rupture was a beaver, working to expand its home.

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

Professors and Delta Independent Science Board members Vincent Resh (right) and Richard Norgaard stand on a levee on Sherman Island along the Sacramento River. (Photo: Edward Caldwell)
When asked to name the three greatest threats to California's water, Richard Norgaard, Berkeley professor of energy and resources (and the DISB's first chair, who still serves on the board), couldn't be more clear.

“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 MagazineRead the complete article.

Posted on Friday, February 26, 2016 at 9:05 AM

Children’s magazine focuses on rangeland animals

The September 2015 issue of Jr. Animal Scientist focuses on rangeland.
Rangeland is where deer and antelope play. It is also home for grazing livestock and many other animals. “Almost half of the land on Earth is rangeland and one-third of the United States is rangeland,” the latest issue of Jr. Animal Scientist tells its young readers. A 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.” 

In the magazine, readers will find descriptions of the different kinds of rangeland, a map of rangelands and photos of some wildlife species that live on rangelands. It also includes a word scramble and rangeland-related jokes (“Why do cows wear bells? Because their horns don't work!”)

“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.

 

Posted on Thursday, September 24, 2015 at 9:13 AM

Sustainability - what does it really mean?

What is sustainable agriculture?
Sustainability has become a buzzword. Everywhere you look it's sustainable this, sustainable that. But what does it really mean? What makes something truly sustainable? And what does it mean in terms of food production?

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.

Posted on Wednesday, June 5, 2013 at 8:48 AM
  • Author: Marissa Palin
Tags: agriculture (5), ASI (1), food system (1), sustainability (1), webinar (1)

Feeding billions in the face of climate change

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.

 

Posted on Wednesday, March 20, 2013 at 6:45 AM

Webinar: Hearing Loss Prevention in Agriculture

Presenters will include Janet Ehlers, RN, MSN, Occupational Health Nurse and Pamela Graydon, MS, COHC, Electronics Engineer.

Who should participate? Anyone who works with people exposed to noise in farming. This train-the-trainer online workshop will include how to select and insert hearing protection properly. In order to practice what is being demonstrated, please bring at least one kind of formable (foam) earplugs to the workshop.

Tuesday, October 4, 2011                                    3:00 pm to 4:15 pm Eastern DST

1. To connect to telephone conference:

Toll free (877)784-2189

Participant code 7518864

2. To connect to internet session:

Meeting ID: 33RZ9H  

Entry Code: pmwdkh

A limited number of phone lines are available, make arrangements earlier.

Tuesday, November 15, 2011                                 9:00 am-10:15 am Eastern DST

1. To connect to telephone conference:

Toll free (877) 784-2189

Participant code 7518864

2. To connect to internet session:

Meeting ID: N84CTW

Entry Code: kmirew

 

Pre-registration is not necessary. However, a limited number of phone lines are available.  To help assure that you and your staff can participate, call and log in early. If all phone lines are taken, please see information on the next page to obtain additional dates of times when this workshop is offered.

Instructions for joining the online workshop
To participate in this online workshop, both a computer with an internet connection and a telephone line are necessary. The presenters will be using a system named Microsoft Office Live Meeting to show the slides and visual aids. To listen and interact with the presenters, the user will need to connect to a telephone conference call.  The instructions for both are explained below.

Caution first time users:  To save time before the online workshop, check your system to make sure it is ready to use Microsoft Office Live Meeting.


To access the online workshop:  

1. Go to: https://www.livemeeting.com/cc/cdc/join

2. Copy and paste the required information from the above tables for the meeting that you will be participating.

Notice: Microsoft Office Live Meeting can be used to record meetings. By participating in this meeting, you agree that your communications may be monitored or recorded at any time during the meeting.


 

For additional information on this workshop, presentation handouts, other possible dates for this same workshop, or to order the free brochures contact:

Janet Ehlers at: jehlers@cdc.gov           Jose Lainez at: jlainez@cdc.gov


 

Free brochures are available in single copies or bulk orders for your organization
They can also be viewed or printed electronically via www.cdc.gov/niosh/topics/noise

They’re your ears – Protect them (#2007-175) primarily describes the problem, e.g. the relationship between noise exposure and hearing loss, and provides information to overcome resistance to hearing protection device usage.   They're your ears is also available electronically in Spanish.

Have you Heard? Hearing Loss Caused by Farm Noise is Preventable (#2007-176) primarily describes appropriate selection and use of hearing protective devices, e.g. ear plugs.

 
Posted on Thursday, September 8, 2011 at 4:06 PM
Tags: Agriculture (5), hearing loss (1)
 
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