Spatial and temporal differences of agricultural water utilization composite index in irrigated farmland of China
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Abstract:
Based on the use of generalized water resources and the existing evaluation index system of agricultural water, considering regional irrigation efficiency、water productive efficiency、source of water resources and consumptive ways to build agricultural water utilization composite index (C-index). Collecting data from major irrigation districts of China, this paper quantified irrigation C-index from 1998 to 2010, explored the spatial differentiation characteristics. Results showed that: the C-index on provincial level presented an increasing trend, national C-index increased from 0.550 to 0.704, the structure of water for food production trended to be rationalization; Spatial autocorrelation analysis results showed that, C- index on provincial scale gathered significantly in space, Moran's I inspection values were higher than confidence level (0.01). High value provinces concentrated in Huang-Huai-HaiPlain and north of ChangJiang River, low value provinces widely concentrated in the south of Chang Jiang River, Northeast and Southeast China; Attribute of local autocorrelation is stable, about 20 provinces showed high-high positive autocorrelation (HH) and low-low positive autocorrelation (LL). Spatial differentiation characteristics of C-index from natural features, agricultural production conditions are also analyzed. This paper provides references for making evaluation methods for agricultural water use and making macro policies of water resources management.
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