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)
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.
Wu Pute, Zhao Xining, Cao Xinchun, et al. Status and thoughts of Chinese “agricultural northtosouth water diversion virtual engineering”[J]. Transactions of the CSAE, 2010, 26(6): 1-6. (in Chinese)
Cao Xinchun, Wu Pute, Wang Yubao, et al. Application of virtual water trade theory in interregional grain allocation and transportation in China[J]. African Journal of Biotechnology, 2011,10(80): 8463-18471.
刘鹄,赵文智. 农业水生产力研究进展[J]. 地球科学进展,2007,22(1):58-65.
Liu Hu, Zhao Wenzhi. Advances in researches of agriculture water productivity[J]. Advances in Earth Science, 2007, 22(1): 58-65. (in Chinese)
Du Wenyong, He Xiongkui, Hu Zhenfang,et al. Effect of different irrigation technology on production of winter wheat[J]. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(2):170-174.(in Chinese)
Li Quanqi, Chen Yuhai, Liu Mengyu, et al. Effects of irrigation and straw mulching on microclimate characteristics and water use efficiency of winter wheat in North China[J]. Plant Production Science, 2008, 11 (2): 161-170.
Li Quanqi, Chen Yuhai, Zhou Xunbo, et al. Effects of different planting patterns on water use efficiency and marginal profits of winter wheat[J]. Transactions of the Chinese Society for Agricultural Machinery, 2010, 41(7): 90-95.(in Chinese)
Li Bin,Zeng Qingzhu. Study on integration between computer monitoring system and optimization model in irrigation channel distribution[J]. Drainage and Irrigation Machinery, 2005, 23(4):25-28. (in Chinese)