我国净生态系统碳交换量(NEE)的时空变化特征研究

Study on the Spatial-temporal Change Characteristics of Net Ecosystem Exchange(NEE) in China

利用LPJ（Lund-Potsdam-Jena）全球动态植被模型,对1971~1998年我国陆地净生态系统碳交换量（NEE）的年总量变化、空间分布格局及变化特征进行了分析。结果表明,近30年来我国的碳汇强度在波动中呈增强趋势,多年平均总碳汇强度为-0.25 Gt.C/a。全国不同区域年均净碳交换量差别显著,整体表现为东部碳汇强而西部弱,除西北部分荒漠草原地区外,全国大部分地区为碳汇区。1985~1998年平均相对于1971~1984年平均,我国不同地区NEE的变化存在较大的空间差异,其中内蒙的中部地区则由原来的弱碳汇区转为弱碳源区,大部分地区碳汇增强。

The annual amount change,spatial distribution patterns and change eharaeteristies of net ecosystem exchange （NEE） in China during 1971 - 1998 were analyzed. The results showed that the intensity of the carbon sink was gradually increased in the past 30 years, with the annual mean NEE of -0.25 Gt C/a.The annual mean NEE had significant difference in different regions of China.The carbon sink in eastern China was stronger than that in western China.Exeept some northwest desert and grassland in northwest China,most areas in China were carbon sink areas. Compared with annual mean NEE during 1971 - 1984,NEE changes in different regions of China during 1985- 1998 had greater spatial difference. The middle areas of Inner Monongalia turned into weak carbon souree area from the previous carbon sink areas. While earbon sink in most areas were strengthened.