云雾山草地土壤氮素及有机碳空间变异特征  

Spatial Variability of Soil Organic Carbon and Total Nitrogen in Yunwu Mountains Grassland in Loess Plateau

作　　者：范亚宁[1] 党蕊娟[1] 李世清[1] 郑纪勇[1] 

机构地区：[1]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室、西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《水土保持研究》2007年第4期82-86,共5页Research of Soil and Water Conservation

基　　金：国家自然科学基金（30230230,30571116）;西北农林科技大学研究生教育创新计划项目;黄土高原土壤侵蚀与旱地农业国家重点实验室基金（10501-104）资助.

摘　　要：生态系统中的生物和非生物因子普遍存在着异质性,土壤全氮和有机碳是土壤中养分的重要组成部分,其也存在着空间异质性。采用传统统计学和地统计学相结合的方法,对云雾山草地90 m×90 m区域内的土壤全氮和有机碳进行空间异质性分析。结果表明,0～20 cm土层有机碳和全氮呈典型的正态分布,全氮和有机碳的平均含量分别为2.373 g/kg和24.711 g/kg,变异系数分别为10.16%和13.47%,存在空间上的中等强度变异性。全氮和有机碳在不同的方向上都属于带状异向性,都具有强烈的空间相关性,二者的空间等值线图相似,且在不同方向上自相关尺度不同。整个研究区域的半方差走势图发生漂移现象,在符合内蕴和平稳假设的区域内,实验值和拟合值拟合程度较高。The spatial distribution of bio-and abiotic factors in ecosystem has features of spatial variaility in general; soil organic carbon （SOC） and total nitrogen （TN） also have spatial variability in soil. The classical statistics method and geostatistics method are used to analyze the spatial variability of grassland soil organic carbon and total nitrogen in Yunwu Mountain in a 90 m×90 m grid , The result showed, SOC and TN presents normal distribution in 0-20 cm soil layer; the means of the SOC and the TN are 2,373% and 24. 711% respectively, and variance coefficients are 10.16% and 13.47%. SOC and TN are all zonal heterogeneity in different directions, they have similar spatial contour map; they were found spatially dependent significantly and have different spatial correlation range in different directions. In the whole area, the semi-variogram graph presents floating feature, but experimental data correspond to simulative ones highly.

关 键 词：地统计学 空间变异 有机碳 全氮 

分 类 号：S151.9[农业科学—土壤学]