作　　者： ; ;

机构地区： 浙江大学

出　　处： 《草地学报》 2005年第z1期10-14,共5页

摘　　要： 根据植物光合作用机理和太阳辐射在植冠层中的传输方程,推导光合作用产物与叶面积指数关系的解析式和叶面积指数与植被指数关系的解析式,通过复合函数求导得到光合作用产物与植被指数关系的解析式,建立草地生产力遥感动力模拟模型。利用1992-1994年的产草量资料和对应时相的NOAA/AVHRR资料建立草地生产力光谱监测模型和卫星遥感监测模型,验证结果表明,用卫星资料可以准确监测草地生产力。 According to the absorption, reflection and transmission characteristics of solar radiation on plant canopy and plant photosynthesis mechanism, the analysis expressions between the photosynthesis production (P_n) and leaf area index(LAI), and those between the leaf area index and vegetation index are achieved. The results show that the variation of canopy photosynthesis production is dependent upon leaf area index, and the ratio vegetation index (RVI) and normal difference vegetation index (NDVI) are dependent upon the near-infrared canopy reflectance. Using the differentiation chain rule, the common variable LAI may be eliminated in order to obtain the expression for the variation of P_n with RVI and NDVI. Using the data tested at Urumqi, Fukang and Altai in 1992-1994, the spectral and satellite simulation models are established.

关 键 词： 天然草地 生产力 光谱 遥感 模拟模型

领　　域： [农业科学] [农业科学] [农业科学]