青藏高原典型高寒草甸区土壤有机碳氮的变异特性  

Spatial Variability Characteristics of Soil Organic Carbon and Nitrogen Reveal Typical Alpine Meadow Degradation on Qinghai-Tibetan Plateau

作　　者：李元寿[1,2] 张人禾[1] 王根绪[3] 赵林[2] 丁永建[2] 王一博[4] 

机构地区：[1]中国气象科学研究院,北京100081 [2]中国科学院青藏高原冰冻圈观测研究站,兰州730000 [3]中国科学院成都山地灾害与环境研究所,成都610041 [4]兰州大学资源与环境学院,兰州730000

出　　处：《环境科学》2009年第6期1826-1831,共6页Environmental Science

基　　金：国家重点基础研究发展计划(973)项目(2007CB411504);国家自然科学基金项目(40701022,90511003);国家社会科学基金项目(08CMZ010);冰冻圈科学国家重点实验室开放基金项目(SKLCS07-06);水利部公益性行业科研专项(2007SHZ1-46)

摘　　要：本研究应用地统计学的基本原理与方法（半方差分析）对青藏高原典型高寒草甸区0-10 cm土壤有机碳和全氮空间变异性进行了分析.结果表明,0-10 cm的土壤有机碳和全氮的平均含量分别为11.45 g·kg^-1和1.02 g·kg^-1,平均变异系数分别为0.23和0.21,反映出该植被区土壤肥力较为贫瘠.土壤有机碳和全氮随机因素的变异占总空间异质性变异的比率分别为44.7%和49.9%,变异尺度分别为210.9 m和200.1 m,随机因素的影响主要发生在采样尺度〈10 m的范围之内.在该研究区域上土壤有机碳和全氮均表现出空间自相关因素大于随机因素的变异格局;在空间结构的变异上,由土壤内在属性如土壤矿物质、地形等空间自相关因素和人为因素如放牧及工程施工等对土壤表层的践踏引起的随机因素共同起作用,影响程度呈中等水平.The principle of geo-statistics method was used to analyse the spatial heterogeneity of soil organic carbon and total nitrogen （0-10 cm） of alpine meadow of the Qinghai-Tibetan Plateau. The results show that the mean contents of soil organic carbon and total nitrogen at depth 0-10 cm are 11.45 g·kg^-1 and 1.02 g·kg^-1 , 0.23 and 0.21 of co-variation coefficient,respectively. As mentioned above all factors reflect oligotrophic condition of soil fertility at this habitat. Organic carbon and entire nitrogen of soil random factor dissociation take up mutant proportion of general space heterogeneity being 44.7% and 49.9% respectively. Mutant dimension is 210.9 m and 200.1 m respectively. The soil organic carbon and the entire nitrogen show on the research territory vacates to oneself the factor to be bigger than machine the factor the different pattern. On space structure dissociation, from inherent attribute of soil, if space such as soil mineral substance, landform is certainly relevance, the factor and the artificial factor play role if the random factors that be trampled on to soil super crust arouses such as grazing and engineering construction is common, Medium memorial level affecting degree.

关 键 词：高寒草甸 土壤有机碳 全氮 空间异质性 青藏高原 

分 类 号：X144[环境科学与工程—环境科学]