基于多种卫星的县级尺度干旱监测指数比较——以河北玉田县为例  

Comparative Study of Different Drought Indexes Based on Multi-source Remote Sensing on County Scale:A Case Study of Yutian County

作　　者：孙丽[1] 裴志远[1] 马尚杰[1] 王连林 马志平 宋振华[1] 钱凤娇[1] 

机构地区：[1]农业部规划设计研究院,北京100125 [2]玉田县发展计划局,河北唐山064100

出　　处：《地理与地理信息科学》2014年第4期46-50,共5页Geography and Geo-Information Science

基　　金：国家科技支撑计划资助项目(2012BAH33B02)

摘　　要：为确定不同遥感数据源在县级尺度进行干旱监测的能力,利用环境减灾卫星、SPOT4和RAPIDEYE数据分别构建了垂直干旱指数、修正垂直干旱指数和温度植被干旱指数,以河北玉田县为例进行了对比研究。结果表明,基于环境减灾卫星的垂直干旱指数和修正垂直干旱指数变化与RAPIDEYE趋势一致,在冬小麦拔节期,当土壤含水量较高时,两指数值起伏变化不明显;在抽穗期,两指数能较好反映各层土壤含水量的起伏变化。而基于SPOT4的修正垂直干旱指数在一定程度上反映土壤含水量的变化特点,垂直干旱指数对土壤含水量变化不敏感。从数据源选取角度,环境减灾卫星和RAPIDEYE在县级尺度具有较好的干旱监测能力。由于基于环境减灾卫星的温度植被干旱指数与冬小麦单产具有显著以上水平的相关性,据此建立的线性估产模型是一种简单易行的旱灾预警模型。Satellite remote sensing technology has become one of the most important methods of drought monitoring at present.To identify different satellites＇ ability of drought monitoring on county scale,three satellites were used including Huanjing satellite,SPOT4 and RAPIDEYE,together with three indexes,such as Perpendicular Drought Index,Modified Perpendicular Drought Index and Temperature-Vegetation Dryness Index.The results show that during winter-wheat jointing stage,Perpendicular Drought Index and Modified Perpendicular Drought Index produced by Huanjing satellite and RAPIDEYE have consistent trends,but they couldn＇t reflect the change of soil moisture while it is high.During heading stage,both the above indexes could adequately reflect the fluctuate change of soil moisture in different depths.However,only Modified Perpendicular Drought Index produced by SPOT4 could reflect the change of soil moisture,Perpendicular Drought Index is not sensitive to soil moisture.From data source selection point of view,Huanjing satellite and RAPIDEYE have good capability to monitor drought on county scale.In addition,for Temperature-Vegetation Dryness Index produced by Huanjing satellite has significant correlation with winter-wheat yield,two linear regression models between Temperature-Vegetation Dryness Index and winter-wheat yield have been built,which is a simple and easy early warning method.

关 键 词：干旱监测 垂直干旱指数 修正垂直干旱指数 温度植被干旱指数 

分 类 号：S127[农业科学—农业基础科学]