关键词: 净初级生产力(NPP), C-FIX模型, 遥感, 黑河流域

Abstract: In this paper, the Monteith type parametric model-C-FIX, the 1 km SPOT4/VEGETATION data and the global meteorological data provided by Meteo France were used to estimate the net primary productivity(NPP) of the different ecosystems in the Heihe River Basin from the year of 1998 to 2002.The annual total NPP of the whole basin was estimated about 18.16 Tg C(1 Tg=10¹²).The annual mean NPP only equal to 106 g·m^-2·a^-1 over the study area of 128 000 km².The spatial pattern of the annual-accumulated NPP, the monthly dynamics of NPP as well as the NPP changes from 1998 to 2002 in the basin were illustrated and descript in detail.In addition, different ecosystems and their corresponding NPP were compared and evaluated by using the land-use map of the basin. The results showed that the spatial and temporal patterns of NPP in the Heihe River Basin were attributable to the complex interaction between natural environment, various climates and human activities.Among them, the restricted water resource was the main element to control the basin's NPP.Moreover, a continuously decrease NPP during the last five years existed in the closed grassland of the mountainous and the desert of the down streams, indicating a pronounced ecological degradation in these areas.The series of the NPP outputs and the evaluation results will be useful in the design and management of water-ecology-economy systems of the Heihe River Basin.

Key words: Net Primary Productivity(NPP), C-FIX model, Remote Sensing, the Heihe River Basin