摘要
陆地生态系统土壤有机碳储量变化是全球气候变化研究的重要方面,而耕地土壤有机碳含量是当中最活跃的部分,与人类利用行为以及社会经济发展水平相联系。文章选取黄淮海平原的北京市大兴区、河北省曲周县和黄土高原的山西省兴县的446个耕作层土壤20世纪80年代和2000年的有机碳含量数据和当地的社会经济、投入产出资料,结果表明:20年来,不同区域耕地土壤有机碳含量存在空间变异,但是其空间分布格局并未发生变化;对土地的集约利用并未造成土壤有机碳含量的降低,相反,各区域土壤有机碳含量普遍增加。结合相应的农户调查和统计资料,发现区域经济发展强烈地影响着土壤有机碳储量发生变化。无论自然条件优劣,还是经济发展水平处于何种阶段,经济的发展都能够促使农户增加对土地的投入,经济发达地区有充足的资金和市场保障,通过农业结构调整会增加对土地的投入;经济落后地区追求作物高产,促使土地投入也不断增加;使得作物经济产量和生物产量获得提高,促使耕地土壤有机碳含量增加。
The soil organic carbon content of terrestrial ecosystem is the important part of global climate change research. As the most active part, the soil organic carbon content is strongly related with the land use and the economic development level. The goal of this paper is to find the possible economic factors that may influence the dynamic change in soil organic carbon, using soil organic carbon data from the early 1980s to 2000, as well as corresponding field survey data and official statistical data. Results from simple analyses show that the economic development level plays an important role in promoting soil organic carbon; the spatial distribution of soil organic carbon didn＇t alter at all, while the soil organic carbon content is increasing in 3 regions. No matter what the economic development level is, the development of the economy can make the fancier increase their input to the land, which contributes to the enhancement of the contents of the soil organic carbon.
出处
《生态环境》
CSCD
北大核心
2006年第1期74-79,共6页
Ecology and Environmnet
基金
国家自然科学基金项目(49871005)
国家重点基础研究发展规划项目(G19990118)
关键词
经济发展水平
投入水平
耕地土壤
有机碳含量
变化
economic development level
input level
agro-topsoil
organic carbon content
change
