![]() ![]() Īt the same time, California is at the forefront of innovative approaches to CSA. As the United States’ largest agricultural producing state (2012 farmgate production valued at $44.7 billion, or 11% of the US total) agriculture also accounted for approximately 8% of California’s greenhouse gas (GHG) emissions statewide for the period 2000–2013. California epitomizes the agriculture-climate challenge, as well as its opportunities. An evolving set of tools, approaches and metrics are being employed under the term “climate smart agriculture” (CSA) to help-from small and industrial scale growers to local and national policy setters-develop techniques at all levels and find solutions that strike that production-environment balance and promote various ecosystem services. As the human population heads toward 9 billion or beyond by 2050, there is an acute need to balance agricultural output with its impact on the environment, especially in terms of greenhouse gas (GHG) production. Allometric equations based on simple and practical biomass and biometric measurements could enable winegrape growers to more easily estimate existing and future C stocks by scaling up from berries and vines to vineyard blocks.Īgriculture is a key human activity in terms of food production, economic importance and impact on the global carbon cycle. Vineyard C partitioning obtained in this study provides detailed C storage estimations in order to understand the spatial and temporal distribution of winegrape C. Strong, positive correlations were found between the diameter of the trunk and overall woody C stocks (R 2 = 0.85), pruning weights and leaf and fruit C stocks (R 2 = 0.93), and between fruit weight and annual C stocks (R 2 = 0.96). Annual biomass was estimated at 1.7 Mg C ha −1 from leaves and canes and 1.7 Mg C ha −1 from fruit. Total vine C was estimated at 12.3 Mg C ha −1, of which 8.9 Mg C ha −1 came from perennial vine biomass. Carbon stocks at the vineyard block scale were validated from biomass mounds generated during vineyard removal. ![]() We characterize C stocks in terms of allometric variation between biomass fractions of roots, aboveground wood, canes, leaves and fruits, and then test correlations between easy-to-measure variables such as trunk diameter, pruning weights and harvest weight to vine biomass fractions. In this study, we used destructive sampling to measure C stocks in the woody biomass of 15-year-old Cabernet Sauvignon vines from a vineyard in California’s northern San Joaquin Valley. Considering 7.2 M ha are dedicated to winegrape production globally, the potential for annual C capture and storage in this crop is of interest to mitigate greenhouse gas emissions. Quantifying terrestrial carbon (C) stocks in vineyards represents an important opportunity for estimating C sequestration in perennial cropping systems. ![]()
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