• Percent change in grassland soil carbon sequestration potential

    Metadata Updated: May 25, 2018

    Percent change in grassland soil carbon sequestration potential. These maps display the percent change in the potential for grassland soil carbon sequestration for each watershed under three IPCC-SRES scenarios – A1B, A2 and B1. Watershed boundaries are from the 8-digit Watershed Boundary Dataset (http://water.usgs.gov/GIS/huc.html). Here soil carbon represents soil organic carbon (up to 20 cm in depth). Future change in soil carbon was modeled by the U.S. Geological Survey's General Ensemble Biogeochemical Modeling System (GEMS) (http://www.usgs.gov/climate_landuse/land_carbon/BGM.asp). Carbon model outputs were produced through the U.S. Geological Survey's (USGS) national carbon sequestration assessment of ecosystem carbon stocks, carbon sequestration, and greenhouse-gas fluxes under present conditions and future scenarios, required by the U.S. Congress (Energy Independence and Security Act of 2007). Under GEMS, soil carbon was estimated annually from 2006 to 2050 using three ecosystem models: the Erosion-Deposition-Carbon Model (EDCM), the CENTURY model, and a spreadsheet model. Change in carbon was based on land use-land cover change, simulations of areas burned by wildland fires, agricultural land management, climate, and other biophysical data. This rangelands project used the average of EDCM and CENTURY soil carbon model outputs for years 2010 and 2040 for each of three IPCC-SRES scenarios (A1B, A2 and B1). The maps display the percent change in grassland soil carbon sequestration potential by watershed. Percent change in carbon sequestration potential is influenced by the extent of grassland conversion within a watershed over the 30 year time period. In most cases, grassland conversion to another land use such as development or intensive agriculture leads to a loss in soil carbon, and reduces the potential for future carbon sequestration. This metric and is calculated as: ΔC = [(A2040* ΔSOCg + Achange ΔSOCd)/ (A2010 ΔSOCg)] - 1 Where: ΔC = percent change in grassland soil carbon sequestration A2010 = grassland area in 2010 A2040 = grassland area in 2040 Achange = area of grassland converted between 2010 and 2040 ΔSOCg = average change in soil organic carbon on undisturbed grassland from 2010 to 2040 ΔSOCd = average change in soil organic carbon on grasslands converted between 2010 and 2040 Reference Zhu, Zhiliang, and Reed, B.C., eds., (2012) Baseline and projected future carbon storage and greenhouse-gas fluxes in ecosystems of the Western United States: U.S. Geological Survey Professional Paper 1797, 192 p. (Also available at http://pubs.usgs.gov/pp/1797/.)

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    Metadata Date 2017-11-02T06:40:23.000+00:00
    Metadata Created Date May 25, 2018
    Metadata Updated Date May 25, 2018
    Reference Date(s) April 1, 2014 (publication)
    Frequency Of Update

    Metadata Source

    Harvested from California LCC Products Harvest Source

    Additional Metadata

    Resource Type Geographicdataset
    Metadata Date 2017-11-02T06:40:23.000+00:00
    Metadata Created Date May 25, 2018
    Metadata Updated Date May 25, 2018
    Reference Date(s) April 1, 2014 (publication)
    Responsible Party (Principal Investigator, Point of Contact); California Landscape Conservation Cooperative (Point of Contact)
    Contact Email
    Access Constraints
    Coupled Resource
    Frequency Of Update
    Guid 285a5601-2801-4e78-8d2f-1e0ec33dac88
    Harvest Object Id efad23ae-1c21-4339-b094-d4f8e560d446
    Harvest Source Id f92ea9c3-80cd-4d71-ab39-ffffb0c659b5
    Harvest Source Title California LCC Products Harvest Source
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    Metadata Language
    Metadata Type geospatial
    Progress Completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True

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