kreitler_farmland

kreitler_farmland -...

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Evaluating a farmland ecosystem service using MODIS Jason Kreitler May 20 th , 2005 ESM266
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Goal of the analysis: Illustrate farmland is valuable for more than its simple provisioning service – ecosystem service of carbon sequestration Develop a technique to assess this ecosystem service spatially and temporally (nation, state, season, year, etc)
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Methods of analysis: Measure Gross Primary Productivity (GPP) The rate at which a plant or ecosystem fixes carbon n n n n n n respiratio GPP PSNnet PSNnet NPP - = = 365
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MOD17A2 data product: Inputs measured with the MODIS satellite Algorithm based on Monteith (1972)* Derived from MODIS LAI/FPAR, land cover, and biome specific climatology data 1km resolution – global coverage *Monteith, J.L.,1972. Solar radiation and productivity in tropical ecosystems. Journal of Applied Ecology . (9) 747-766.
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MOD17A2 data product:
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Unformatted text preview: http://edcdaac.usgs.gov/modis/mod17a2v4.asp Data inputs: MOD17A2 Map of California farmland Map of California county boundaries Data processing in ModelBuilder: Input data operations final (process repeated for all scenes) Results: Analysis Mean Median Std dev Range Jan 01 4.8 4 4.2 0 - 47 July 03 19.9 19 13.5 0 - 136 Difference 15.1 15 11.8-30 - 99 Table values in gC/m^2/day California Farmland totals: Jan 01 205,000 metric tons C/day July 03 819,000 metric tons C/day CA CO2 ~ 1,000,000 metric tons C/day* *Californias Greenhouse Gas Emission Inventory, 1990. www.epa.gov Conclusion: California farmland sequesters ~ 80% of CO2 emissions in summer, ~ 20% in winter Wouldnt it be neat if we valued carbon sequestration and other ecosystem services?...
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