本文用1989—1991年在天山北坡不同草场类型上观测的牧草产量与光谱资料以及同步接收的 NOAA/AVHRR资料,计算了牧草产量与各种植被指数的相关系数。结果表明,天然草场牧草产量与各种植被指数存在显著相关,并建立天然草场牧草产量动态监测光谱模型;牧草干重和鲜重与气象卫星比值植被指数的相关系数达0.7597和0.8066;建立牧草产量卫星遥感监测模型,可用于天然草场牧草产量的动态监测。

Using the grass yield and spectral data observed in the years 1989-1991 in different types of natural grassland in the middle section of the Tianshan North Slope and the synchronous NOAA/AVHRR data, the correlation coefficients between the grass yield and various vegetation indices are calculated. The results show that there exists an obvious correlation between the grass yield and various vegetation indices. The dynamic monitoring spectral model of the grass yield is established. The correlation coefficient between the dry weight of grass and the NOAA/AVHRR ratio vegetation index is 0.7597, and that between the green weight of grass and the NOAA/AVHRR ratio vegetation index is 0.8066. Then the satellite remote sensing monitoring model of grass yield is established. This model can be used to monitor the grass yield of natural grassland.