环青海湖区退化芨芨草群落的土壤碳密度特征  

Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake

作　　者：曹生奎[1,2,3] 陈克龙[1,2] 曹广超[1,2] 朱锦福[2] 卢宝梁[4] 

机构地区：[1]青海师范大学生命与地理科学学院,青海西宁810008 [2]青海师范大学青海省自然地理与环境过程重点实验室,青海西宁810008 [3]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [4]中国科学院青海盐湖研究所,青海西宁810000

出　　处：《水土保持通报》2014年第2期73-77,82,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目"青海湖内陆高寒湿地景观尺度碳库动态测定与模拟"(41261020);国家社科基金项目(10CJY015);中科院"西部之光"〔科发人教字(2012)179号〕;青海师范大学科技创新计划项目

摘　　要：通过对环青海湖区退化芨芨草群落的土壤容重和有机碳含量的测定分析,确定了退化芨芨草群落的土壤碳密度特征。结果显示,重度退化芨芨草群落的土壤容重显著大于中度退化芨芨草群落的土壤容重。重度退化芨芨草群落土壤有机碳含量普遍低于中度退化芨芨草群落,特别是两者表层土壤有机碳含量差异极为显著(p<0.001)。在0—100cm剖面上,中度退化芨芨草群落土壤有机碳含量总体呈减少趋势,重度退化的则呈现减少和先增加后减小的两种变化趋势。芨芨草群落土壤有机碳密度跟有机碳含量变化趋势一致;芨芨草群落土壤有机碳主要集中在0—30cm土层,中度和重度退化下该深度土壤有机碳密度分别为7.35和2.92kg/m2,占整个剖面有机碳密度的57.45%和63.06%;环青海湖区中度和重度退化芨芨草群落剖面土壤有机碳密度为12.79和4.63kg/m2。Based on measurements of soil bulk density and organic carbon content,this paper studied the characteristics of soil organic carbon density in degrading Achnatherum splendens communities around the Qinghai Lake.Results showed that soil bulk density under the heavily degraded Achnatherum splendens communities was apparently greater than that in the moderately degraded communities.Soil organic carbon content in the moderately degraded Achnatherum splendens communities was generally higher than that in the heavily degraded.Especially,there existed an extreme apparent difference in surface soil organic carbon content between them.In the 0—100cm soil profile,soil organic carbon content showed a decreasing trend in the moderately degraded Achnatherum splendens communities and however,the heavily degraded communities displayed two kinds of trend,i.e.,decreasing trend and the trend of first increasing and then decreasing with soil depth.Soil organic carbon density showed the same trend as its content.Soil organic carbon was mainly distributed in the 0—30cm soil layer.Soil organic carbon densities in the layer in the moderately and heavily degraded Achnatherum splendens communities were 7.35and 2.92kg/m2,respectively,occupying 57.45%and 63.06% of the total soil organic carbon densities in the whole soil profile.In the profiles,soil organic carbon densities in the moderately and heavily degraded Achnatherum splendens communities around the Qinghai Lake were 12.79and 4.63kg/m2,respectively.

关 键 词：退化群落 高寒草地 土壤剖面 有机碳密度 

分 类 号：S812[农业科学—草业科学] S153.6[农业科学—畜牧学]