中国农作物绿水占用指数估算及时空差异分析

从农作物生长消耗的绿水量入手,构造了农作物绿水占用指数,选取中国31个省区作为研究对象,通过对农作物绿水占用指数的计算,揭示中国各省区农业生态系统对绿水资源占用情况的空间分布特征,发现农作物绿水占用指数高的地区以黄淮海平原为核心集中分布,低的地区则主要分布在中国的西部。利用空间自相关分析方法,对中国1997～2007年农作物绿水占用指数的总体空间区域差异及时间演变趋势进行研究,结果显示,中国农作物绿水占用指数空间上存在着显著的集聚现象,但该现象逐年呈减弱趋势。结合局部自相关分析,对中国31个省区11年间的农作物绿水占用指数区域分异的时空演变规律进行探索,并对演变原因做出解释。

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.