达拉特旗九大渠荒漠植物光谱特性研究

Spectral Characteristics of Desert Plants in Jiudaqu,Dalat Banner

掌握和了解达拉特旗光谱特征,不仅可为当地干旱区荒漠植物的遥感识别奠定基础,对于干旱区的演变、环境调控及遥感反演等都具有重要的价值。以内蒙古自治区鄂尔多斯市达拉特旗九大渠的丘陵沟壑区为研究区,选取当地6种荒漠植物沙蒿、沙打旺、唐松草、雾冰黎、杨柴、紫穗槐为研究对象,利用美国生产的SVC HR-1024便携式地物光谱仪对当地的6种荒漠植物进行了地面反射光谱测定,得到了6种荒漠植物的高光谱数据。结果表明:①沙打旺、沙蒿、唐松草、雾冰黎、杨柴、紫穗槐6中荒漠植物变化趋势基本相似,总体符合植物光谱特征的规律性;但在6个波段区间反射率差异明显,可用于区分不同的荒漠植物;②生长期的荒漠植物红边位置都靠近长波方向,红边位置不同,荒漠植物的红边幅值及红边位置也不同;③不同荒漠植物,植被指数的大小也不同。九大渠荒漠植物的DVI明显高于NDVI、RENDVI、PRI、mSR705、PSRI、RVI、SAVI指数。依据同一种植物的8种植物指数同时按小或大排序,将沙打旺、沙蒿、唐松草、雾冰黎、杨柴、紫穗槐进行区分。

Understanding the spectral characteristics of Dalat Banner can not only lay a foundation for remote sensing identification of desert plants in arid areas,but also have important value for evolution,environmental regulation and remote sensing inversion in arid areas.Taking the hilly and gully region of Jiudaqu,Dalat Banner,Ordos City,Inner Mongolia Autonomous Region as the study area,six local desert plants,Artemisia desertorum Spreng.,Astragalus laxmannii Jacquin,Thalictrum aquilegiifolium var.,Bassia dasyphylla,Turczaninow and Amorpha leaves fruticosa Linn.were selected as the research object.The ground reflectance spectra of six desert plants in the region were measured by SVC HR-1024 portable ground object spectrometer produced in the United States,and the hyperspectral data of 6 desert plants were obtained.The results showed as follows:①The variation trends of desert plants were basically similar,which generally accorded with the regularity of spectral characteristics of plants.But the reflectance difference was obvious in the six bands,which could be used to distinguish different desert plants;②The position of the red edge of desert plants in the growing stage was close to the long-wave direction,and the amplitude and position of the red edge of desert plants were different with different positions of the red edge;③The DVI of desert plants in Jiudaqu was significantly higher than that of NDVI,RENDVI,PRI,mSR705,PSRI,RVI,SAVI index.According to the index of 8 plants of the same plant,Astragalus laxmannii Jacquin,Artemisia desertorum Spreng.,Thalictrum aquilegiifolium var.,Bassia dasyphylla,Turczaninow and Amorpha fruticosa Linn.were distinguished by small or large order.