Abstract:
Based on the SPOT-4 VEGETATION data set and meteorological data, the models of CASA, photosynthesis and forestation costs method were applied to simulate the temporal and spatial rule of the yield of fixed carbon and released oxygen, and analyze the relationship between the environment factors and the function of carbon fixation and oxygen release. The results are as follows:(1) All the simulations of the net primary productivity(NPP) were basically agreement with the experimentally measured values. Among the 10 types of vegetations, the highest NPP in Jinghe river basin was broadleaved deciduous forest, which was 317.36 g·C/(m2·a), the lowest was grassland, which was 98.71 g·C/(m2·a). (2) From 1998 to 2010, the annual average yields of fixed carbon and released oxygen were steady ,which were 658.82×104 t and 485.02×104t respectively in Jinghe river basin. The yields of fixed carbon and released oxygen appeared obviously seasonal characteristics, and the sequence was winter
