کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4393588 1305492 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Biomass production, evapotranspiration and water use efficiency of arid rangelands in the Northern Cape, South Africa
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Biomass production, evapotranspiration and water use efficiency of arid rangelands in the Northern Cape, South Africa
چکیده انگلیسی

Annual above-ground net primary production (ANPP), evapotranspiration (ET) and water use efficiency (WUE) of rangeland have the potential to provide an objective basis for establishing pricing for ecosystem services. To provide estimates of ANPP, we surveyed the biomass, estimated ET and prepared a water use efficiency for dwarf shrublands and arid savanna in the Riemvasmaak Rural Area, Northern Cape, South Africa. The annual production fraction was surveyed in 33 MODIS 1 km2 pixels and the results regressed against the MODIS fPAR product. This regression model was used to predict the standing green biomass (kg DM ha−1) for 2009 (dry year). Using an approach which combines potential evapotranspiration (ET0) and the MODIS fPAR product, we estimated actual evapotranspiration (ETa). These two models (greening standing biomass and ETa) were used to calculate the annual WUE for 2009. WUE was 1.6 kg DM mm−1 ha−1 yr−1. This value may be used to provide an estimate of ANPP in the absence of direct measurements of biomass and to provide a comparison of the water use efficiency of this rangeland with other rangeland types.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 75, Issue 11, November 2011, Pages 1223–1227
نویسندگان
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