高寒草原生态系统表层土壤活性有机碳分布特征及其影响因素——以贡嘎南山-拉轨岗日山为例  

Influential factors and distribution characteristics of topsoil labile organic carbon in alpine grassland ecosystem at 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,林芝860000 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《生态学报》2009年第7期3501-3508,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(40661007)

摘　　要：对贡嘎南山-拉轨岗日山南坡高寒草原生态系统表层(0～20cm)土壤活性有机碳分布特征研究表明:表层(0～20cm)土壤活性有机碳平均为(2.4986±0.7864)g/kg,占表层土壤有机碳的(12.7926±21.00)%。在海拔4424～4804m范围内,随着海拔升高,表层(0～20cm)土壤活性有机碳含量表现出先减少后增加的分布特征,有机碳活度也表现出先减少后增加的分布特征。影响表层土壤活性有机碳含量最关键的环境因子是地上生物量、0～10cm地下生物量、30～40cm地下生物量、20～30cm土壤含水量、0～20cm土壤容重、20～40cm土壤容重和土壤全N量;影响表层土壤有机碳活度最关键的环境因子则是植被盖度、20～30cm地下生物量、0～10cm土壤含水量、10～20cm土壤含水量、20～30cm土壤含水量、土壤有机质、土壤速效K和土壤全N量。The distribution characteristics of the topsoil （0- 20cm） labile organic carbon of alpine grassland ecosystem at the south slope of Gongga south mountain-Laguigangri mountain were studied. The results showed that, the average content of the topsoil （0 - 20cm） labile organic carbon was （ 2. 4986 ± 0. 7864） g/kg, accounting for （ 12. 7926 ±21.00） % of the topsoil organic carbon in alpine grassland ecosystem at the south slope of Gongga south mountain-Laguigangri mountain. With increasing altitude, the distribution characteristics of the topsoil （0 -20cm） labile organic carbon and organic carbon lability were decrease→increase within the altitude range of 4424 -4804m. The key environmental factors influencing the content of topsoil labile organic carbon were overground biomass, biomass of underground 0 - 10cm and 30 - 40cm, moisture of underground 20 - 30cm, soil bulk density of underground 0 - 20cm and 20 - 40cm, and soil total Nitrogen content. However, the key environmental factors for the topsoil （0 -20cm ） organic carbon lability were vegetation coverage, 20 - 30cm belowground biomass, 0 - 10cm, 10 - 20cm and 20 - 30cm underground soil moisture, soil organic matter, soil labile Potassium and soil total Nitrogen content.

关 键 词：高寒草原生态系统 活性有机碳 分布特征 影响因素 

分 类 号：S812.2[农业科学—草业科学]