摘要
1997年～ 1998年在内蒙古达拉特旗中国农业科学院草原研究所草原生态试验站对天然草地、天然草地转变为人工草地、玉米和土豆地后 ,土壤 CO2 排放和 CH4 吸收通量进行了测定。天然草地、人工草地和旱地农田均为大气中甲烷的吸收汇 ,天然草地转变为农田后 ,增强了土壤的 CO2 排放量 ,减少了土壤对大气中甲烷的吸收。天然草地和玉米地的 CO2 排放通量与 5cm处土壤温度呈线性相关 ,土壤对甲烷的吸收率与土壤含水量呈线性负相关 。
During the period of 1997-1998, the Dalate Grassland Ecosystem Experimental Station of the Grassland Institute, Chinese Academy of Agricultural Sciences carried out a research project determining soil CO 2 emission and CH 4 uptake fluxes of natural grassland, erected milkvetch grassland, corn field and potato field(the latter three had been reclaimed from the former). Results show that natural grassland, erected milkvetch grassland and upland farm field were all sinks for atmospheric methane.The conversion of natural grassland to farmland increased CO 2 emission from the soil and decreased CH 4 uptake by the soil from the atmosphere. CO 2 emission from the natural grassland and cornfield was in positive linear relationship with soil temperature in 5 cm depth while the CH 4 uptake of the soil was in negative linear relationship with soil moisture.
出处
《农村生态环境》
CSSCI
CSCD
2000年第2期14-16,44,共4页
Rural Eco-Environment
基金
科技部和国家自然科学基金重大项目"中国农业生态系统与全球变化相互作用的机理研究"!(编号 398993 70 -3 )
关键词
草原土地
二氧化碳排放
甲烷吸收
土壤
温室气体
CO_2, emission, CH_4, uptake, grassland, greenhouse gases, land use, soil
