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| Spatial and temporal variation of crop water productivity in China |
| CAO Xin-Chun-1, 2 , WU Pu-Te-1, 2 , 3 , WANG Yu-Bao-1, 2 , ZHAO Xi-Ning-2, 3 , ZHANG Bao-Qing-1 |
| (1.College of Water Resources and Architectural Engineering, Northwest A ＆ F University, Yangling, Shaanxi 712100, China; 2.Institute of Water Saving Agriculture in Arid Regions of China, Northwest A ＆ F University, Yangling, Shaanxi 712100, China; 3.National Engineering Research Center for Water Saving Irrigation at Yangling, Yangling, Shaanxi 712100, China) |
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Abstract In order to evaluate the water use efficiency in agriculture in China, the data relevant to the water used for crop production of 459 large irrigation districts in 31 provinces in the years of 1998, 2005 and 2010 were collected; then the values of Grain Irrigation Water Productivity (G) was calculated. The spatial autocorrelation analysis was carried out to study the spatial and temporal variation of G during 1998—2010. The results revealed that G is increased with year in every large irrigation district in all the provinces; meanwhile, the G for a representative year is 1.03 kg/m3, the maximum one is 2.15 kg/m3 in Henan and the minimum is 0.25 kg/m3 in Hainan. There is a clear spatial clustering phenomenon, i.e. a higher G is in HuangHuaiHai region whilst a lower one is found in the south of China. The amplitudes of change in G in Jiangxi, Anhui and Chongqing are different from their neighbors, a localized effect is presented. The reasons for such spatial and temporal variation of G were elaborated.
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Received: 30 September 2011
Published: 10 April 2012
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