基于植被遥感干旱指数的河南省干旱监测研究

Research on drought monitoring in Henan Province based on drought index of vegetation remote sensing

目前,基于遥感的植被干旱监测指数繁多,但是,这些指数具有空间异质性,需要考虑其在不同区域的适用性。本文基于2000―2018年河南省中分辨率成像光谱仪(MODIS)数据,计算了4种基于植被指数的干旱监测模型,并分别与自校准帕默尔干旱指数(sc-PDSI)进行相关性研究,以评价其在河南省的适用性,为中原粮仓的高效干旱监测提供依据。研究结果表明,4种模型均表现出整体增加的干旱化趋势,作物水分指数(CWSI)和植被供水指数(VSWI)表现更为突出;在空间上,河南省易旱区重心呈现整体向西迁移的趋势。

Nowadays,there are many types of drought monitoring indices based on vegetation remote sensing,while their applicability needs to be considered in different areas since these indices have spatial heterogeneity.Therefore,the MODIS data in Henan Province from 2000 to 2018 were selected in this paper,four drought monitoring models based on vegetation index were calculated,and their correlation research with sc-PDSI were conducted to evaluate its applicability in the study area,as well as to provide basis for effective drought monitoring for granaries in Central China.The results indicated that,all the four models showed an overall increasing trend of drought,and especially the CWSI and VSWI indexes.From a spatial perspective,the central drought-prone areas in Henan Province showed a trend of overall westward migration.