【摘要】 基于2002—2010年SPOT-VGT归一化植被指数(NDVI)时间序列影像数据、土壤湿度数据和降水数据,利用趋势分析模型和相关分析方法,对吉林省西部地区NDVI动态变化及其与降水量、土壤湿度的关系进行了定量分析.结果表明:研究区NDVI值对降水的变化的响应滞后1～2月,NDVI与其前一个月降水量的相关系数最大,为0.85,与春夏秋季的降水显著正相关,与冬季降水显著负相关;研究区生长季NDVI对土壤湿度的响应明显,且随着土壤深度的增加,土壤湿度对NDVI的影响逐渐减弱.更多还原

【Abstract】 Using the consecutive 324decadal SPOT-VGT NDVI images from 2002to 2010,soil moisture data and cumulative precipitation during crop growing season,spatio-temporal NDVI changes and the relationship between NDVI,soil moisture and precipitation in Western Jilin Province were analyzed in this study.Results show that the study area has enjoyed a slowing increasing in annual NDVI and soil moisture.The deeper depth of soil was,the weaker impact soilmoisfure has on NDVI.NDVI generally responds to precipitation with a lag of one or two months,the positive correlation coefficient between NDVI and the last month’s precipitation is greatest with 0.849,larger than NDVI and the current month(0.653),the month before last(0.669)and the up last month(0.253).Precipitation in autumn have the highest positive correlation coefficient of 0.611 with NDVI,followed by spring,summer,while correlation in winter is negative at the level of 0.01.更多还原