1a.Objectives (from AD-416)
Characterize soil variability through a landscape-targeted approach emphasizing major soil landscape relationships to stratify the two winegrowing regions into geographic management templates; link greenhouse gas (GHG) emissions and vineyard nitrogen retention to these templates; Extend research findings.
1b.Approach (from AD-416)
Characteriztion of GHGs in response to vineyard floor management; Assessment of tradeoffs for weed pressure and N loss through leaching; Performance of life cycle analyses to assess whole vineyard GHG footprints; Repackage digital soil survey into geographical management templates that depict specific soil properties (and microclimates) that govern C and N dynamics and their respective affinities for C and N within the soil landscape; Develop a publication using a grower-friendly format, and include practical methods for measuring carbon (C) sequestration and reducing GHG emissions and nitrate leaching.
The agreement was established in support of Objective 4 of the in-house project, the goal being to investigate the impacts of vineyard practices on soil microbial ecology. The goal of this project is to characterize soil variability through a landscape-targeted approach emphasizing major soil landscape relationships to stratify the two winegrowing regions into geographical management templates and link greenhouse gas emissions and vineyard nitrogen retention to these templates. The research goal is to identify how vineyard management practices affect greenhouse gas (GHG) emissions, carbon (C) stocks, and GHG footprints. The study will occur in North Coast and San Joaquin Valley winegrowing regions. Deliverables include. 1)`Best management practices' to increase nitrogen retention and balance production and weed control,. 2)Calculation of C offsets potentially gained by reductions in nitrous oxide emissions and increases in soil C content,. 3)A decision support system using a web-based GIS to enhance on-farm soil C stocks,. 4)grower-friendly publication by partnering with National Center for Appropriate Technology. Significant progress has been made during FY2011. Intensive grower interviews to determine management practices across nearly 100 vineyards in Napa and Lodi have been conducted. A third of these sites have been sampled for soil characteristics to 1m depth, and soil samples are currently being processed. The remaining sites will be visited in Fall 2011. Cooperation between scientists at Applied Geosolutions, LLC has proceeded, and the interactive website where growers can evaluate impacts of their management practices and landscape attributes influence GHG emissions has been initiated. Further, we are cooperating with the California Sustainable Winegrowing Alliance (CSWA) to coordinate our efforts on the website and the life cycle analysis of grower practices as they impact both GHG emissions but other environmental factors like water quality. Equipment necessary for measuring GHG emissions was built and installed across numerous vineyards to capture the effect of management and soil landscape attributes on soil nitrogen cycling. These findings will also be contributed to the project managed by CSWA, in which the DeNitrification/DeComposition model is being refined for use in California winegrapes. The grower-friendly publication is underway, and partners at UC Davis, USDA/ARS and NCAT are developing the specific goals and content for the publication.