关键词: 森林植被, 净生产量, 动态变化

Abstract: According to the net primary productivity data of 1 266 samples about different forest ty pes in China, the functional relationship between biomass, volume, community g row th and annual li tter fall about Chinese major forest types were established and the net production and dynamic changes about Chinese forest ecosystems were studied by using the data from six NFIs of China from 1973 to 2003.The results showed that the net production of Chinese forest vegetation was 1 360.64×10⁶t/a during the 6th NFI, and the average net primary productivity was 9.53 t/hm².a.The net production was composed mainly of young and middle-age forests and had some differences between dif ferent regions with the net production hig her in northeast and southwest, and lower in other reg ions.From 1973 to 2003, the net production of Chinese forest vegetation increased from 790.13×10⁶t/a to 1 360.64×10⁶t/a.The net production was the low est before 1970s and then increased gradually. Whereas the average net primary productivity of Chinese forest vegetation was higher before 1970s and decreased until the end of 1990s and then increased again.

Key words: forest vegetation, net production, dynamic change