Spatial and temporal variation of crops green water occupancy index in China

A crop green water occupancy index(CGWOI) is constructed on the crop green water consumption.Values of the CGWOI are calculated for all the 31 provinces of China from 1997 to 2007.The spatial autoco rrelation analysis is carried out to study the spatial and temporal variation of CGWOI.The result reveals that high values of CGWOI are in Chinas' Huang-Huai-Hai region,while regions with low CGWOI values are found in the west. The clustering phenomenon is clearly evident in the earlier spatial distributions of CGWOI.However,the weakening significance of the phenomenon has been dominated in the distributions.Combining results of both spatial and local autocorrelation analysis,the regularity of CGWOI spatial and temporal variations for the 31 provinces from 1997 to 2007 is also studied and discussed.