The Effect of Biogenic Crusts on the Spectral Reflectance of the Semi-arid Regions 

作成者 Karnieli Arnon
日本十進分類法 (NDC) 450, 512.75
内容 研究概要:The Normalized Difference Vegetation Index (NDVI) which is derived from satellite sensor images is widely used as a measure of vegetation and ecosystem dynamics, change in land use, desertification and climatic change processes on a regional or global scale. Surprisingly, in semi-arid regions, relatively high values of NDVI were measured in landscapes where little, if any, photosynthetic activity of higher plants exists. We tested the hypothesis that the high NDVI values may be caused by the photosynthetic activity of microphytes (lower plants), consisting of mosses, lichens, algae, and cyanobacteria, which cover most of the rock and soil surfaces in semi-arid regions. We found that the spectral reflectance curves of lower plants can be similar to those of the higher ones and their derived NDVI values can be as high as 0.30 units. We conclude that in semi-arid environments, the reflectance of lower plant communities may lead to misinterpretation of the vegetation dynamics and overestimation of ecosystem, productivity.
コンテンツの種類 研究報告書 Research Paper
DCMI資源タイプ text
ファイル形式 application/pdf
掲載誌情報 Proceedings of the international symposium on "The role of remote sensing for the environmental issues in arid and semi-arid regions" page.181-185 (1997)
言語 英語

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