Water footprint of grain production based on crop water consumption
Liu Di1,2, Cao Xinchun1,2, Wang Yubao1,2
1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Water Saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract：According to the water footprint and crop water consumption theory, the production water footprint of crop calculation model based on the actual crop water consumption was presented. Taking on the winter wheat and summer maize in the Guanzhong Region of Shaanxi Province as the objective of the study, the production water footprint of the grains in 1998, 2005 and 2010 were calculated and analyzed. The results show that: the water consumption of a certain crop(winter wheat or summer maize)in the same year is varied form district to district. Compared with the crop water requirement, average water consumptions of wheat and maize in three years are 16.2% and 12.4% lower respectively. Variable trends of the virtual water content of winter wheat and summer maize have reduced year by year, and average virtual water content are 0.96 and 0.77 m3/kg respectively. The proportion of blue water in virtual water of wheat is 10%-40%, and the change range of maize is 20%-50%,meanwhile, the proportion of blue water between regions has not a significant change trend. The production water footprint of grain were 7.01, 5.98 and 6.07 billion m3 in the three representative years, and all of them are larger than the local water resources when the proportion of blue water footprint is 29.1%; The calculation of water footprint based on the actual consumption of crops has great significance on the scientific research and policy based on water footprint and virtual water trade.
刘帝,, 操信春,, 王玉宝,. 基于田间实际耗水的作物生产水足迹[J]. 排灌机械工程学报, 2014, 32(8): 719-724.
Liu Di,, Cao Xinchun,, Wang Yubao,. Water footprint of grain production based on crop water consumption. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(8): 719-724.
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