内蒙古锡林河流域主要类型草原土壤中CH_4和CO_2浓度的变化  

CH_4 AND CO_2 CONCENTRATION IN SOILS OF THE MAJOR GRASSLANDS OF THE XILIN RIVER BASIN OF INNER MONGOLIA

作　　者：纪宝明[1] 王艳芬[1] 李香真[1] 王跃思[2] 陈佐忠[1] 郑循华[2] 

机构地区：[1]中国科学院植物研究所植被数量生态学开放研究实验室,北京100093 [2]中国科学院大气物理研究所,北京100029

出　　处：《植物生态学报》2001年第3期371-374,共4页Chinese Journal of Plant Ecology

基　　金：中国科学院重大项目! ( KZ95 1-A1-3 0 1);特别支持项目! ( KZ95 T-0 4-0 3 )

摘　　要：于 1999年生长季对内蒙古锡林河流域主要类型草原土壤中 CH4和 CO2 浓度进行测定 ,结果表明 :CH4浓度沿土壤剖面逐渐降低 ,而且不同土壤深度之间差异显著 ,而 CO2 浓度呈现出沿土壤剖面增加的趋势。草甸草原、羊草 (L eymus chinesis)草原和大针茅 (Stipa grandis)草原土壤中 CH4的浓度差异显著 ,季节变化明显 ,但是三类草原土壤中 CO2 浓度变化不大。测定结果还表明 :一定时间尺度上 ,放牧对草原土壤中 CH4和 CO2 的浓度没有显著影响。Field observations of CH 4 and CO 2 concentration down soil profiles in the major grassland communities of Xilin River Basin of Inner Mongolia in 1999 indicate that the distribution of methane through the soil profile was different from that of carbon dioxide. Methane concentration decreased gradually with soil depth while the concentration of carbon dioxide showed a strongly increasing trend. On the other hand, methane concentration in the soil of meadow steppe, Leymus chinensis steppe and Stipa grandis steppe, a series driven by moisture gradients in Xilin River Basin, differed significantly with seasonal variation. Variation in the time scale of impacts may partially account for the result that there was no significant effect of grazing on CH 4 and CO 2 concentration in the grassland soil.

关 键 词：内蒙古 草原土壤 CH4 CO2浓度 温室气体 

分 类 号：Q948[生物学—植物学]