摘要
基于 1∶40 0万的《中华人民共和国土壤图》和第二次土壤普查数据 ,运用地理信息系统技术 ,对中国土壤有机碳密度及储量做出估算 ,并且分析了土壤有机碳密度的空间分布差异。结果表明 :10 0cm深度的土壤有机碳密度介于 1 19kgm- 2 到 176 46kgm- 2 之间 ,2 0cm深度的土壤有机碳密度介于 0 2 7kgm- 2 到53 46kgm- 2 之间 ;10 0cm和 2 0cm深度的土壤有机碳储量分别为 84 4Pg (1Pg =10 15 g)和 2 7 4Pg ;土壤有机碳密度具有高度的空间变异性 ,东北地区、青藏高原的东南部、云贵高原等森林、草甸分布的地区有机碳密度最高 ,准噶尔盆地、塔里木盆地、阿拉善高原与河西走廊、柴达木盆地等沙漠化地区的土壤有机碳密度最低 ;土壤有机碳密度的空间分布主要受气候。
Soil organic C plays an essential role in carbon cycle and carbon stor age in a native ecosystem reflects that ecosystem's capacity to sequester ca rbon . Based on soil map of China (1∶4 000 000) combined with a soil database from t h e second soil survey of China, soil organic carbon storage to the depths of 100 cm and 20 cm were estimated for China using geographical information system. Car bon density of different soil types ranged from 1 19 kg m -2 to 176 46 kg m -2 at depth of 100 cm , and from 0 27 kg m -2 to 53 46 kg m -2 at depth of 20 cm. In tota l, about 84 4 Pg was stored in 0～100 cm, and 27 4 Pg in the 0～20 cm soil lay er. The amount of carbon varied significantly at different districts in China. Nort h east China, the south and east of Qinghai Tibet Plateau and southwest China had high carbon density. Tarim Basin, Caidam Basin, Junggar Basin and other deserti f ication districts had low carbon density. This distribution showed an important climatic influence. Soil organic carbon would diminish with decreasing precipit a tion and increasing temperature. On the other hand, the activities of human bei ngs may affect the range of soil carbon.
出处
《土壤学报》
CAS
CSCD
北大核心
2004年第1期35-43,共9页
Acta Pedologica Sinica
基金
中国准备初始国家信息通报的能力建设项目 (CPR/0 0 /G31 /A/1G/99)资助
关键词
中国
土壤
有机碳
密度
储量
计算
空间分布
Soil organic carbon density
Carbon storage
Map of carbon density
China
