典型农作物波谱与环境要素的关系研究

农作物冠层光谱是植物冠层光谱与周围环境光谱的混合光谱。利用北京小汤山地区的冬小麦在2001年4~5月生长期内的土壤含水量和冬小麦波谱观测数据,以及北京海淀区的夏玉米在2003年7~9月生长期内的LAI和夏玉米波谱观测数据,分析了在不同生育时期条件下,典型农作物(如冬小麦,夏玉米)的波谱数据与主要环境要素之间的相互关系。结果表明:在夏玉米抽丝期前叶面积指数与冠层光谱反射率相关性较差,而在抽丝期后相关性较好;冬小麦的苗期土壤含水量与冠层光谱在近红外波段相关系数较高,并在1 360~1 380 nm拟合得出方程。经检验,在α=0.01水平下是显著的。

Study on Relationship between Typical Canopy Spectra of Corp and Main Environment Factors

Canopy spectra of crop is mixed with canopy spectra of vegetable and background spectra. Using soil water content and the canopy reflectance spectral data of winter wheat in Xiaotangshan of Beijing in 2001 ,and the leaf area index （LAI）data and canopy spectral data of summer corn in P~ijing, the spectral reflectance data of typical corps under different growth-development periods and relationships between the reflectance and main environment factors were studied. We found the correlation coefficient between LAI and canopy spectral reflec- tance was low before the heading period, however, was high after the heading period. The correlation coefficient between canopy spectra of winter wheat and the soil water content was high and the equation was worked out at 1 360-1 380 nm（α=0.01）.