基于森林资源清查资料的森林植被净生产量及其动态变化研究

根据我国不同森林类型共1 266个样地的生物量、生产力和蓄积量资料,建立中国主要森林类型生物量与蓄积量、生物量与群落生长量和年凋落量之间的函数关系,并利用1973-2003年间中国6次森林资源清查资料,研究中国森林植被净生产量及其动态变化。研究结果表明:1999-2003年间中国森林植被净生产量为1 360.64×106t/a,平均生产力为9.53 t/(hm2.a),植被净生产量构成以幼龄林和中龄林为主且存在较大的区域差异,东北和西南地区植被净生产量较高;其它地区植被净生产量相对较小。近30年中国森林植被净生产量由第一次森林资源清查时的790.13×106t/a增加到1999-2003年间的1 360.64×106t/a,20世纪70年代末期,中国森林植被净生产量较低,之后开始逐步增加;中国森林植被平均生产力的变化与净生长量的变化不同,20世纪70年代末期,中国森林植被平均生产力较高,而后开始下降,直到90年代末之后才开始恢复增长。

Dynamics of Net Production of Chinese Forest Vegetation Based on Forest Inventory Data

According to the net primary productivity data of 1?266 samples about different forest types in China,the functional relationship between biomass,volume,community growth and annual litter 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 different regions with the net production higher in northeast and southwest,and lower in other regions.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 lowest 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.