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A meta-analysis of global crop water productivity of three leading world crops(wheat,corn,and rice)in the irrigated areas over three decades

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International Journal of Digital Earth 2020年第8期13卷 939-975页

作者： Daniel J.Foley prasad S.Thenkabail itiya p.aneece pardhasaradhi G.Teluguntla Adam J.Oliphant Western Geographic Science Center United States Geological SurveyFlagstaffAZUSA Bay Area Environmental Research Institute(BAERI) NASA Research ParkMoffett FieldCAUSA

The overarching goal of this study was to perform a comprehensive metaanalysis of irrigated agricultural Crop Water productivity(CWp)of the world’s three leading crops:wheat,corn,and rice based on three decades of remote sensing and non-remote sensing-based ***,CWp data from 148 crop growing study sites(60 wheat,43 corn,and 45 rice)spread across the world were gathered from published articles spanning 31 different *** was overwhelming evidence of a significant increase in CWp with an increase in latitude for predominately northern hemisphere *** example,corn grown in latitude 40–50°had much higher mean CWp(2.45 kg/m^(3))compared to mean CWp of corn grown in other latitudes such as 30–40°(1.67 kg/m^(3))or 20–30°(0.94 kg/m^(3)).The same trend existed for wheat and rice as *** soils,none of the CWp values,for any of the three crops,were statistically ***,mean CWp in higher latitudes for the same soil was significantly higher than the mean CWp for the same soil in lower *** applied for all three crops *** wheat,the global CWp categories were low(≤0.75 kg/m^(3)),medium(>0.75 top(≥1.10 kg/m^(3)).For corn the global CWp categories were low(≤1.25 kg/m^(3)),medium(>1.25 to≤1.75 kg/m^(3)),and high(>1.75 kg/m^(3)).For rice the global CWp categories were low(≤0.70 kg/m^(3)),medium(>0.70 to≤1.25 kg/m^(3)),and high(>1.25 kg/m^(3)).USA and China are the only two countries that have consistently high CWp for wheat,corn,and *** and India have medium CWp for wheat and ***’s corn,however,has low ***,Turkey,Netherlands,Mexico,and Israel have high CWp for ***,Argentina,and Hungary have high CWp for corn,and philippines has high CWp for *** other countries have either low or medium CWp for all three *** on data in this study,the highest consumers of water for crop production also have the most potential for water *** countries are USA

关键词： Crop water productivity sustainable agriculture water use/water savings wheat corn rice food and water security

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