腾格里沙漠典型植物含水率与地物光谱的关系分析

doi:10.7522/j.issn.1000-694X.2013.00106

摘要/Abstract

摘要：

地物光谱特征不仅是遥感机理研究的重要内容，亦是遥感应用分析的重要依据。用ASD手持式光谱仪测定了腾格里沙漠10种典型植物的冠层光谱，对测得光谱数据进行包络线去除和一阶微分处理，并在实验室采用烘干法得到植物的含水率，运用相关系数法分析植物含水率与经包络线去除的光谱数据之间的关系，同时分析了不同含水率植物的红边特征。结果表明：研究区植物最大含水率为88.19%，最小含水率为37.34%;含水率与包络线去除的光谱数据在可见光（561~718 nm）和近红外（861 nm，894 nm）波段均存在极显著相关性，并建立了两者之间的回归模型，说明可见光近红外波段可以反映沙漠植物的水分状况;不同含水率植物的红边参数有所差异。

关键词: 光谱特征, 包络线去除, 一阶微分, 含水率, 腾格里沙漠

Abstract:

The spectral features of ground objects are not just the significant content of mechanism research of remote sensing, but also the important basis of remote sensing application. In this paper, the canopy hyperspectral data of ten plants in the Tengger Desert were measured in-situ with a Fieldspec HandHeld spectroradiometer, and water content of the corresponding plants was measured in lab. The canopy hyperspectral data were processed in continuum removal and first derivative methods, the relationship between the water content of plants and continuum removal reflectance spectrum was analyzed by correlation coefficient method and characteristics of the red edge was analyzed at the same time. The results showed that the water content of main plants ranged from 37.34% to 88.19%; Significant correlation was found between water content and normalized reflectance spectrum in visible (561-718 nm) and near-infrared (861 nm, 894 nm) bands, and the linear regression model was built, which indicated that visible and near-infrared reflectance could reflect water content of desert plants; The characteristics of the red edge of desert plants with different water content vary.

Key words: spectral features, continuum removal, first derivative, water content, Tengger Desert

中图分类号:

Q948.15+1

王鹏龙，张建明，张春梅，许洺山，王磊. 腾格里沙漠典型植物含水率与地物光谱的关系分析[J]. 中国沙漠, 2013, 33(3): 737-742.

WANG Peng-long, ZHANG Jian-ming, ZHANG Chun-mei, XU Ming-shan, WANG Lei. The Relationships between Spectral Features and Water Content of the Dominant Plant Species in the Tengger Desert[J]. JOURNAL OF DESERT RESEARCH, 2013, 33(3): 737-742.

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