| 摘要: |
| 在玉米生长期中,作了11次野外地物反射光谱的测试,测量了玉米植冠的叶面积指数。引用玉米植冠叶面积指数和它截取光合有效辐射系数(APAR)之间的理论公式和经验公式,用实测的玉米植冠的叶面积指数,计算出它吸收光合有效辐射系数,再分别求出玉米植冠的 RVI、ND、PVI、GN 光谱指数和玉米植冠吸收光合有效辐射系数间的抛物线回归方程。得出的结论是,在20个回归方程中,利用 GN 光谱指数,并使用回归方程 APAR=0.2792+6.187GN-13.38GN2来估算玉米植冠吸收光合有效辐射系数 APAR 是最可靠的。 |
| 关键词: 光合有效辐射 光谱反射率 叶面积指数 |
| DOI： |
| 投稿时间：1993-04-20 |
| 基金项目:国家自然科学基金 |
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| Estimating APAR from Spectral Reflectance in Corn Canopies |
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| Abstract: |
| Eleven times spectral reflectances and leaf area indices were measured in corn filed at growing season.The theoretical and experimental formulae between leaf area index(LAI)and absorbed photosynthetically active radiation(APAR)in corn canopies were used.The leaf area index of corn canopies based on practical observation,were used to compute APAR:Then compute separately spectral vegetation indices RVI,ND,PVI,GN and quadric regression formulae between spectral vegetation indices and APAR were established unde... |
| Key words: photosynthetically active radiation spectral reflectance leaf area index |
