黄土丘陵区小流域尺度上土壤有机碳空间异质性  

Spatial Variability of Soil Organic Carbon in Catchment Scale of Loess Hilly Area

作　　者：薛志婧[1] 侯晓瑞[1] 程曼[1] 安韶山[1,2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所,陕西杨凌712100

出　　处：《水土保持学报》2011年第3期160-163,168,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金(40971171);西北农林科技大学"青年学术骨干支持计划"

摘　　要：通过对上黄试区小流域不同土地利用类型下的60个样点的采样分析,结合地统计学原理对小流域土壤有机碳的空间异质性进行研究。试验结果表明,土壤有机碳含量随土层深度的增加而减少,不同土地利用类型下的土壤有机碳存在显著性差异。表层0-10cm的土壤有机碳含量为9.544g/kg,明显高于10-30cm的7.10g/kg和30-60cm的4.63g/kg。通过Kriging插值法估算,其结果也表现出相同的规律。由土壤有机碳含量分布图可知,0-10cm,10-30cm和30-60cm 3层土壤的有机碳含量均表现出天然草地和柠条纯林高于川台地和河滩地。土壤有机碳含量在空间分布上表现出的特征,与动植物在土体中的垂直分布格局、人类社会活动及区域气候条件等因素有关。According to the analysis of 60 sampling points which located in Shanghuang small watershed in loess hilly area.Using geostatistics method analyzed spatial variability of soil organic carbon（SOC） contents.The results indicated thats the SOC contents decreased with the increase of soil depth and in different land use patterns,there existing significant differences.The SOC contents of surface 0-10 cm with 9.544 g/kg was obviously higher than that of 10-30 cm and 30-60 cm which were 7.10 g/kg and 4.63 g/kg respectively.Kriging interpolation results also showed the same trend.Form the analysis of SOC spatial distribution of SOC analysis,three soil depths all showed that natural grassland and caragana pure forests＇ SOC contents were more higher than that of Sichuan terraces and flood lands＇.The spatial distribution characteristics of SOC contents were associated with the vertical distribution pattern of animals and plants in soil profile,the human social activities and regional climate conditions.

关 键 词：土壤有机碳 空间变异 变异系数 小流域 地统计学 

分 类 号：S153.62[农业科学—土壤学]