川中典型紫色丘陵区表层土壤有机碳密度空间变异及影响因素  

Study on Spatial Variability and Its Influential Factors of Topsoil Organic Carbon Density in the Hilly Region of the Middle Sichuan

作　　者：胡玉福[1] 邓良基[1] 王玉婷[1] 马可雅 彭佳佳[1] 齐鹏程[1] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014

出　　处：《水土保持学报》2014年第4期183-187,256,共6页Journal of Soil and Water Conservation

基　　金：四川省科技计划项目(2013SZ0110;2014SZ0059);国家科技支撑计划项目(2008BAK51B02)

摘　　要：根据94个样点表层（0-20cm）土壤有机碳分析化验数据,运用地统计学方法研究川中典型紫色丘陵区清流河流域土壤有机碳密度的空间变异特征及其影响因素,结果表明,该区域表层土壤有机碳密度在4.60∽59.59kg/m2之间,平均值为20.58kg/m2,变异系数为52.32%,属于中等变异强度;土壤有机碳密度总体分布呈团状或条带状分布,其中高值区（〉28.70kg/m2）主要位于研究区东部的大清河下游,并以此为中心,向北、西和南3个方向呈辐射状逐步降低;低值区（〈17.20kg/m2）主要分布在南部、西部和北部;研究区中部土壤有机碳密度多介于17.20∽25.80g/m2。研究区域土壤有机碳密度与土壤母质、地形、土地利用方式、排灌方式和土壤质地等因素密切相关,在不同土壤母质、地形、土地利用方式、灌溉方式和土壤质地下土壤有机碳密度差异达极显著或显著水平。According to the data of the topsoil （0--20 cm） organic carbon collected from 94 random grid and hierarchical sampling points, the spatial variability characteristics and their influential factors of the topsoil organic carbon density in Qingliu river basin in the hilly region of the middle Sichuan were analyzed using the Geostatistical Analyst and ArcGIS 9.0. The results indicated that the mean of the soil organic carbon density was 20.58 kg/m2 , the maximum was 59.59 kg/m2 and the minimum was 4.60 kg/m2. The variation coeffi- cient of the soil organic carbon density was 52.32% belonged to moderate variability. The overall distribution of the soil organic carbon density displayed group or strip belt-shaped. The regions with high soil organ- ic carbon density （〉28.70 kg/m2） were mainly distributed in downstream areas of the Daqing River in the east of study areas. Taking the downstream areas of the Daqing River as the center, the soil organic carbon density gradually decreased towards north, west and south. The regions with low soil organic carbon density （〈17.20 kg/m2） were mainly distributed in the north, west and south of study areas. The soil organic carbon density were 17.20-25.80 kg/m2 in the middle region of study areas. The analysis of influential factors showed that the soil organic carbon density was positively correlated with soil parent material, topography, land use types, irrigation methods and soil texture. The difference of the soil organic carbon density in different soil parent materials,topography, land use types, irrigation methods and soil texture reached extremely remarkable or remarkable level.

关 键 词：有机碳密度 空间变异 影响因素 

分 类 号：S153.61[农业科学—土壤学]