青海省高寒草地土壤无机碳储量空间分异特征  

The variation feature of soil inorganic carbon storage in alpine grassland in Qinghai province

作　　者：刘淑丽[1,2] 林丽[1] 郭小伟[1,2] 李婧[1,2] 欧阳经政[1,2] 杜岩功[1] 张法伟[1] 李以康[1] 曹广民[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001 [2]中国科学院大学,北京100039

出　　处：《生态学报》2014年第20期5953-5961,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金重点项目(41030105);中国科学院战略性先导科技专项(XDA05050404)(固碳现状;速率;机制和潜力)项目

摘　　要：以青海省主要高寒草地类型即温性草原、高寒草原、草甸草原以及高寒草甸为研究对象,进行其土壤无机碳(SIC)储量分异特征研究。结果表明,在取样剖面内四类草地SIC储量依次为温性草原>高寒草原>草甸草原>高寒草甸,其值分别为16.51、16.48、3.37 kg C/m2和0.12 kg C/m2,温性草原与高寒草原土壤是高寒草地无机碳的主要储蓄库。温性草原与高寒草原50—100cm SIC储量分别占0—100cm总储量的60.2%和51.8%,而草甸草原与高寒草甸30—50cm SIC储量分别占0—50cm总储量的50.1%和55.8%,说明土体下部是高寒草地无机碳储蓄的主要场所。四类草地SIC含量随土层深度的变化过程各异,其碳酸钙富集层与野外剖面调查所得碳酸钙盐酸泡沫检验结果相吻合。SIC储量与土壤容重和土壤p H均呈显著正相关关系,与地下生物量呈显著负相关关系。The warm steppe,alpine steppe,alpine meadow steppe and alpine meadow are the main grassland types which widely distribute in Qinghai-Tibetan plateau. It＇s widely distribution and diverse development environments make it play an important role in the ecosystem： supporting regional economic development,guaranteeing water conservation of the plateau,maintaining biodiversity,fixation of carbon,etc. A quantitative survey of the variation feature of soil inorganic carbon（ SIC）stored in warm steppe,alpine steppe,alpine meadow steppe and alpine meadow were carried out in Qinghai province.Results showed that the total storage of SIC in the four types grassland appeared to be warm steppe〉 alpine steppe〉 meadow steppe〉alpine meadow,and the values were 16. 51 kg C / m2,16.48 kg C /m2,3.37 kg C /m2 and 0. 12 kg C / m2,respectively.One-Way ANOVA analysis indicated that warm steppe、alpine steppe had a significant difference with alpine meadow steppe and alpine meadow（ P〈0. 05） while no significant difference between warm steppe and alpine steppe as well as alpine meadow steppe and alpine meadow（ P〉0.05）. The warm steppe and alpine steppe grassland are the main reserve pool of SIC in alpine grassland. The SIC stored in 50—100cm accounted separately for 60.2% and 51.8% of the total storage in 0—100cm profile of the warm steppe and alpine steppe,while in alpine meadow steppe and alpine meadow,it occupied 50.1%and 55.8% respectively of the 30—50cm in 0—50cm. Deep soil layer is the main place of SIC storing in alpine grassland.Soil depth has an important effect on SIC storage in alpine grassland. In 0—50cm depth of the soil,SIC storing in the four types grassland were 6.57 kg C / m2,7.95 kg C /m2,3.37 kg C/m2 and 0.12 kg C / m2,respectively. The change of SIC content with soil depth were different in the four types grassland. It increased with soil depth in warm steppe and alpine meadow steppe,but increased at first then decreased in alpine meadow steppe and alpine meadow. The calcium carbonate

关 键 词：高寒草地 无机碳 储量 分异特征 

分 类 号：S812[农业科学—草业科学]