Mitchell, John E.

Washington‐Allen, Robert A.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Procedures for Estimation of the Livestock Ecological Footprint in US Drylands Robert A. Washington‐Allen Texas A&M University John E. Mitchell U.S. Department of Agriculture Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/4-1/36 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 ]594　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Indicators for Sustainable Use and Conservation of Grasslands/Rangelands ResourcesProcedures for estimation of the livestock ecological footprint in US drylandsRobert A . W ashington‐A llen1 and John E . M itchell21 Department o f Ecosystem Science and Management , Texas A &M University ,2 138 TAMU , College S tation , Texas 77843‐2138 , USA , E‐mail : w ashington‐allen＠ tamu .edu2 USDA‐Forest Serv ice Rocky Mountain Research Station , 2150 Centre A ve . , Building A , Fort Collins , Colorado 80526 ,USA , E‐mail : j emitchell＠ f s .f ed .usIntroduction The ecological condition and trend of the United States摧３ ,９０２ ,０００ km‐２ of Drylands and the extent to which humanmanagement actions contribute to degradation are unknown at the national spatial scale (Washington‐Allen et al . ２００６ ) . Ourresearch seeks to develop procedures for determining the impact or ecological footprint of livestock grazing on the productivecapacity of Drylands at the national spatial scale .Approach The study approach has been to develop a Geographic Information System ( GIS) consisting of digital maps of grossand net primary productivity ( GPP and NPP ) , U .S . Department of Agriculture National Agricultural Statistics Office( NASO) national livestock number and distribution maps , transportation and power consumption networks , gridded climaticdata , land cover , and land use . Maps of GPP and NPP were derived from annually integrated normalized difference vegetationindex ( NDVI) from the Moderate Resolution Infrared Spectroradiometer ( MODIS ) and the Advanced Very High ResolutionRadiometer ( AVHRR) satellite data . Climatic data , particularly mean annual potential evapotranspiration [ MAPET , Zomer etal . (２００６) ] , was derived from the WORLDCLIM dataset developed by Hijmans et al . (２００５) .Secondly , a Dryland extent map was generated using gridded population , transportation data , e .g . , data of roads andrailways , power consumption , land use/ land cover and aridity index ( AI) data in a subtractive overlay GIS procedure . AI is theUnited Nations Convention on Desertification摧s definition of Drylands where AI is the ratio of mean annual precipitation ( MAP)to MAPET that is ≤ ０ .６５ .Thirdly , the NASO data is used to generate livestock number and distribution maps which are intersected with the drylandextent map to yield a livestock footprint map . Lastly , this footprint map is then converted to an annual requirement of foragemap and subtracted from a GPP map to yield a livestock appropriation of net primary productivity map ( LANPP) .ReferencesHijmans , R .J . , S .E . Cameron , J .L . Parra , P .G . Jones and A . Jarvis , ( ２００５ ) . Very high resolution interpolated climatesurfaces for global land areas . International Journal of Climatology ２５ : １９６５‐１９７８ .Washington‐Allen , R .A . , R . D . Ramsey , N . E . West , and R . A . Efroymson . ( ２００６ ) . A Remote sensing‐based protocolfor assessing rangeland condition and trend . Rangeland Ecology and Management ５９ :１９‐２９ .Zomer , R . J . , T rabucco , A . , van Straaten , O . , and Bossio , D . A . ( ２００６ ) . Carbon , land and water : A global analysis ofthe hydrologic dimensions of climate change mitigation through afforestation/ reforestation and the Kyoto Protocol CleanDevelopment Mechanism . Colombo , Sri Lanka : International Water Management Institute . pp ４８ . IWMI Research Report１０１ .

Procedures for Estimation of the Livestock Ecological Footprint in US Drylands

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Procedures for Estimation of the Livestock Ecological Footprint in US Drylands

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