利用EOS/MODIS植被供水指数监测锡林郭勒地区土壤湿度  

Soil Moisture Monitoring with EOS/MODIS VSWI Product in Xilingol

作　　者：贺俊杰[1] 王英舜[1] 李云鹏[2] 乌日娜[2] 吕向伟[3] 

机构地区：[1]内蒙古锡林浩特国家气候观象台,锡林浩特026000 [2]内蒙古生态与农业气象中心,呼和浩特010051 [3]内蒙古自治区气象局,呼和浩特010051

出　　处：《中国农业气象》2013年第2期243-248,共6页Chinese Journal of Agrometeorology

基　　金：内蒙古自治区气象局遥感应用创新团队自选项目(2012)

摘　　要：利用锡林郭勒盟13个测墒站0-10cm土壤相对湿度和对应时段MODIS卫星资料,分析植被供水指数(VSWI)与土壤相对湿度间的相关性。结果表明,二者呈极显著的线性关系(P<0.01),在此基础上建立了基于植被供水指数的土壤相对湿度监测模型。运用该模型反演的土壤相对湿度分布与实测结果基本吻合。从动态监测旱情的变化角度,用植被供水指数(VSWI)监测了锡林郭勒草原在2011年8月旱情的发生、发展和加重过程。说明植被供水指数法适用于植物生长季大范围的干旱监测,通过动态监测,可为及时、准确掌握大范围土壤水分状况和旱情提供决策依据。The relationship between VSWI and relative soil moisture was analyzed based on the MODIS data and observed soil moisture of 0 - 10cm layer in 13 meteorological stations in Xilingol region inner Mongolia. The results showed that there was a linearity relationship between VSWI and relative soil moisture （ P 〈 0. 01 ）, and the relative soilmoisture measurement model was established. The simulation result with the model was in accord with practice. The drought process was monitored in August 2011 in Xilingol grassland. It was feasible to monitor extensive drought using VSWI, and it had important theoretical and practical significance to clarify soil moisture regime and drought.

关 键 词：EOS MODIS 植被供水指数 土壤相对湿度 

分 类 号：S152.7[农业科学—土壤学]