Posts Tagged: land management
Soon after Van Butsic arrived in California in 2013 to join UC Agriculture and Natural Resources, he noticed a pattern. “Fire, water and weed are the three land-use issues that come up no matter who I talk to in this state,” he said. Fire and water were well-covered by UC and other researchers already. But cannabis looked to be an unexploited niche.
UCCE Assistant Specialist Van Butsic uses satellite imagery to analyze the environmental impacts of cannabis production.
So Butsic, a UC Cooperative Extension (UCCE) assistant specialist in land systems science in the UC Berkeley Department of Environmental Science, Policy and Management, decided to build part of his research portfolio around understanding the scope, intensity and landscape impacts of cannabis cultivation in California (a research paper from another area of his research, ecosystem service valuation, appears on page 81 of this issue).
While the environmental impacts of cannabis production have drawn substantial media attention, and though it is by many estimates the state's most valuable crop, data beyond anecdotes is scarce.
Butsic attacked the problem by visually analyzing satellite-based imagery, identifying remote plantations and greenhouses in Humboldt County and mapping them using GIS.
This approach required many hundreds of hours of manual inspection of satellite images, and one of the first challenges was figuring out how to do this labor-intensive work. It wasn't difficult to find UC Berkeley undergraduates interested in working for course credit. Nearly 25 students have now contributed to the project, and two (so far) have moved on to full-time GIS jobs after graduation. An anonymous nonprofit organization provided financial support for a part-time staff researcher and to purchase more recent high-resolution satellite data.
This series of satellite images shows the development of a greenhouse complex in a Humboldt County forest. Using satellite imagery in combination with GIS layers showing topopgraphy, watercourses, zoning and other variables, Butsic and his colleagues can characterize cannabis production sites in a variety of ways, such as average slope, proximity to streams, and whether they are located on land zoned for agriculture.
The team has built a GIS data layer for about half of Humboldt County's land area, identifying roughly 300,000 cannabis plants (equivalent to a wholesale value of perhaps $150 million) based on 2012 imagery, with an updated estimate now in the works. The data layer enables a variety of analyses — from the zoning of the land used by cannabis growers (only about a quarter of the 1,429 grows identified were on land zoned for agriculture); to the slope of cannabis production plots, a factor influencing erosion (almost a quarter are on very steep ground, with slope exceeding 30%); to proximity to salmon streams (more than 200 grows were found within 100 meters of critical habitat for steelhead and chinook salmon) (Butsic and Brenner 2016).
Butsic and his colleagues identified approximately 4,400 grow sites in their research. Five percent of those, including the site pictured above, were within 100 meters of salmon streams.
Butsic estimates the absolute volume of water used to irrigate cannabis to be fairly modest — on the order of a few thousand acre-feet. But that figure probably understates the habitat impact of water diversions; water is withdrawn from small watersheds during summer months when water is scarce, and some creeks are known to have been completely dewatered.
The information is helping to inform local debates. Humboldt County recently adopted an ordinance requiring all new cannabis grows to be developed on land zoned for agriculture (existing grows on nonagricultural land are grandfathered in). This policy raises concerns about rapid inflation of agricultural land, as cannabis growers bid up prices beyond what other farm or livestock operations can support. Butsic's work provides insights into the characteristics and geography of lands that are likely to be developed for cannabis production.
Forest fragmentation occurs when cannabis growers clear land and build roads to access their grow sites. The Butsic team's analysis indicates that 68% of grows were located more than 500 meters from developed roads.
Related to this issue, Butsic and several Humboldt County–based UCCE academics — County Director Yana Valachovic, Area Fire Advisor Lenya Quinn-Davidson, and Livestock and Natural Resources Advisor Jeffery Stackhouse — are currently surveying Humboldt County landowners about cannabis-related land use issues.
Butsic's next steps include continued mapping of cannabis production in California, with Mendocino County to be completed by the end of 2017. Given the uncertainty around federal restrictions on cannabis production under the Trump administration, Butsic said it's difficult to predict what the most essential research questions surrounding cannabis will be. Nonetheless, “by continuing to document on the ground patterns of cannabis production, we will be in a position to answer those questions,” he said.
California forests aren’t natural anymore. Over time, human impacts such as logging and fire suppression have left forests more prone to diseases, insects and wildfires. UC Cooperative Extension received a competitive grant from Cal Fire to launch a forest management training program for private landowners to help protect California’s forests.
There are approximately 33 million acres of forest in California. Forty percent of those acres are owned by families, Native American tribes, or private companies and 27 percent are owned by individuals. According to a report by the National Woodland Owner Survey, 99 percent of family-owned forests are in parcels of 500 acres or less. Less than 1 percent of them had written management plans when surveyed.
Management plans are important — they lead to healthier forests. And healthier forests benefit everyone in California. They protect against devastating wildfires, make for healthier rural communities, better wildlife habitat, improve water quality, and increase carbon sequestration, among other benefits.
The UCCE Forest Stewardship Training Series makes it easy for landowners to create a forest management plan. By creating a written plan, landowners are forced to sit down and think about their goals and objectives, and essentially create a business plan. It’s also an important document when communicating with other professionals, such as bankers, accountants, granting agencies, etc. A management plan lays out the background of the forest, the landowner’s objectives, and the steps the landowner has taken or is taking to achieve those objectives.
online e-learning site. Through the webinar, landowners learn how to set goals and objectives for their forest land and become familiar with their forest land by learning to understand tree management, wildlife, and water quality, recognize insects and diseases, and understand safety and roads. Once the landowner has set their goals and gone through the basic understanding training, they are connected with a professional forester to continue the land management plan process.
Upon completing the online training, landowners are invited to an all-day workshop for a more in-depth understanding of forest land management. Workshops will take place in Ukiah on May 18, Redding on May 29, Berkeley on June 15, and Auburn on June 22. Visit www.ucanr.edu/forest_learning for more information, or contact Rick Standiford, UC Cooperative Extension Forest Management Specialist, at firstname.lastname@example.org.