贡嘎南山-拉轨岗日山南坡高寒草原生态系统表层土壤有机碳分布特征及其影响因素  

Influential Factors and Distribution Characteristics of Topsoil Organic Carbon of Alpine Grassland Ecosystem in the South Slope of Gongga South Mountain-Laguigangri Mountain

作　　者：王建林[1] 欧阳华[2] 王忠红[1] 常天军[1] 李鹏[1] 沈振西[2] 钟志明[2] 

机构地区：[1]西藏农牧学院植物科学技术系,西藏林芝860000 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《土壤通报》2010年第2期346-350,共5页Chinese Journal of Soil Science

基　　金：国家自然科学基金资助项目(40661007)资助

摘　　要：为揭示贡嘎南山-拉轨岗日山南坡高寒草原生态系统表层土壤有机碳分布特征及其影响因素。在不同海拔高度取土样测定土壤理化指标,现场调查植物物种数、土壤类型等,研究了该区域0～20cm土壤有机碳分布特征及其影响因素。结果表明:高寒草原生态系统表层(0～20cm)土壤有机碳密度平均为5.1625±1.2786kgm-2,变异系数24.77%。在海拔4424～4804m范围内,随着海拔升高,表层(0～20cm)土壤有机碳密度表现出增加→减少增加→减少的分布特征。相关分析表明,表层土壤有机碳密度与植被盖度、30～40cm地下生物量、10～20cm土壤含水量、海拔高度、坡度、土壤有机质呈正相关关系,而与0～10cm土壤含水量、30～40cm土壤含水量、土壤pH值和土壤速效N呈负相关关系,影响表层土壤有机碳密度最关键的环境因子是30～40cm地下生物量、土壤pH值、土壤有机质和土壤速效N含量。For the exploration of the influential factors and distribution characteristics of the topsoil（0-20 cm） organic carbon of alpine grassland ecosystem in the south slope of Gongga south mountain-Laguigangri mountain,we gathered soil samples from different altitude zones and measured physical and chemistrical index.And plant species and soil types were also surveyed.The influential factors and distribution characteristics of the topsoil（0 20 cm） organic carbon in the south slope of Gongga south mountain-Lagugangri mountain were studied.The results showed that the average density of the topsoil（0-20 cm） organic carbon of alpine grassland ecosystem was 5.1625±1.2786 Kg m2 and variation coefficient was 24.77%.Within the altitude range of 4424-4804 m,the distribution characteristics of topsoil（0-20 cm） organic carbon density showed the trend of increase→decrease → increase→ decrease as the altitude increasing.The topsoil organic carbon density was positively correlated with vegetation coverage,undergrounp 30-40 cm biomass,undergrounp 10-20cm soil moistrue,altitude height,gradient and soil organic matter,but negatively correlated with underground 0-10cm and 30-40cm soil moisture,and soil pH value as well as soil labile nitrogen content.The key environment factors that affected the topsoil organic carbon density were 30-40 cm belowground biomass,soil pH value,soil organic matter and soil labile nitrogen content.

关 键 词：高寒草原生态系统 有机碳 分布特征 影响因素 

分 类 号：S812[农业科学—草业科学]