生态学报2018，Vol.38Issue(7)：2299-2307,9.DOI:10.5846/stxb201706141089
三种干旱指数在干旱区沼泽湿地土壤水分遥感反演中的应用
Application of three drought indexes in soil moisture inversion using remote sensing in marsh wetlands of arid area
摘要
Abstract
Wetland hydrological conditions play a key role in the structure and function of the wetland ecosystem.In this study,we use three drought monitoring methods,Temperature Vegetation Dryness Index (TVDI),Perpendicular Drought Index (PDI),and Normalized PDI (NPDI) as well as soil moisture observation data in the field to study marsh wetlands of an arid area in the middle and lower reaches of the Shule River using a remote sensing technology based on the Landsat8 Operational Land Imager (OLI).We obtained the following results in this study:1) TVDI,PDI,and NPDI were significantly negatively correlated with soil moisture in different soil layers (P＜ 0.01),the goodness of fit among the three drought indexes was in the following order of magnitude NPDI ＞ TVDI ＞ PDI with soil moisture in different soil layers,and the fitting results using the NPDI index were the best with topsoil moisture;2) there were numerous significant differences in soil moisture among different soil layers of the same marsh type (P ＜ 0.05),and an increasing trend in the soil moisture of different marsh types was observed with increasing soil depth;3) the soil moisture was significantly different between different marsh types of the same soil layer (P ＜ 0.05),and the comparison of soil moisture in the different soil layers showed the following decreasing order of magnitude:marsh meadow ＞ herbaceous marsh ＞ seasonal saline marsh ＞ inland salt marsh.关键词
干旱指数/干旱区/沼泽湿地/遥感影像/土壤水分/反演Key words
drought indexes/arid area/marsh wetland/remote sensing image/soil moisture/inversion引用本文复制引用
葛少青,张剑,孙文,王利平,耿亚军,范双萍..三种干旱指数在干旱区沼泽湿地土壤水分遥感反演中的应用[J].生态学报,2018,38(7):2299-2307,9.基金项目
国家自然科学基金项目(41461012) （41461012）
甘肃省自然科学基金项目(1208RJZA114) （1208RJZA114）
