タイトル | Remote detection of air pollution stress to vegetation - Laboratory-level studies |
著者(英) | Price, Curtis V.; Westman, Walter E. |
著者所属(英) | NASA Ames Research Center |
発行日 | 1987-01-01 |
言語 | eng |
内容記述 | An experimental investigation of the role of leaf chemistry, anatomy, moisture content, and canopy density on spectral reflectance in healthy and pollution stressed western conifer needles and broad-leafed species of California coastal sage scrub is presented. Acid mist at a level of pH 2.0 is found to more severely effect chlorophyll loss and leaf death than ozone at a level of 0.2 ppm for a four-week period. Both pollutants cause water loss, affecting Bands 4 and 5 in nonlinear ways. The infrared bands initially rise as free water is lost, and subsequently, scattering and reflectance decline. The net effect is shown to be a reduction in TM 4/3 and a rise in TM 5/4 with pollution stress. Under more severe pollution stresses, the decline of leaf area indices due to accelerated leaf drop accentuates the expected TM 4/3 and TM 5/4 changes. |
NASA分類 | EARTH RESOURCES AND REMOTE SENSING |
レポートNO | 87A53152 |
権利 | Copyright |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/375740 |
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