由光谱指数估算小麦截取光合有效辐射的数量

Intercept Photosynthetically Active Radiation Estimated by Spectral Reflectance in Wheat

引用小麦叶面指数及其截取光合有效辐射数量之间的理论公式和经验公式，由实测的小麦叶面指数计算出它截取光合有效辐射的数量，再分别求出小麦的各种光谱指数和它截取光合有效辐射数量间的线性回归方程。得出的结论是，利用光谱指数ＰＶＩ，并使用线性方程ＰＡＲ＝７８．６ＰＶＩ＋５５．２来估算小麦截取光合有效辐射数量是最可靠的。

This paper introduces the theoretical formulas and the experimental formulas between the leaf-area index and intercept photosynthetically active radiation PAR by wheat.Intercept photosynthetically active radiation are calculated by measuring the leaf-area index of wheat.Second,to find out separately various spectral vegetation indices and the linear regression formulas between various spectral vegetation indices and intercept photosyntheticaily active radiation by wheat.It came to the conclusion that it is the most reliable to estimate intercept photosynthetically active radiation by wheat,using the spec-tral vegetation index PVI and the linear regression formula PAR=78.6PVI+55.2.