栗钙土不同土地利用方式下有机碳和无机碳剖面分布特征  

Profile distribution of soil organic and inorganic carbon in chestnut soils of Inner Mongolia

作　　者：杨黎芳[1] 李贵桐[1] 赵小蓉[1] 林启美[1] 

机构地区：[1]中国农业大学资源与环境学院∥土壤与水农业部重点实验室//土壤植物相互作用教育部重点实验室,北京100094

出　　处：《生态环境》2007年第1期158-162,共5页Ecology and Environmnet

基　　金：国家自然科学基金项目(40303015)

摘　　要：栗钙土是半干旱地区典型的地带性土壤,主要分布在内蒙古自治区。文章以内蒙古自治区乌兰察布盟(简称乌盟)和锡林河流域为例,分析了栗钙土有机碳和无机碳含量及其密度的剖面分布特征,旨在了解不同土地利用方式下土壤碳库的储量和分布特点及其成因与机理。结果表明:土壤无机碳在剖面上的分布有两种类型:高—低—(高)—(低)型和低—高—(低)—(高)型,后者可能是由于土壤侵蚀引起的碳酸盐再分布所形成的。100cm深的土壤有机碳密度的平均值为8.48kg·m-2,退耕地>耕地>干旱半干旱草原>典型草原,主要分布在表层,0～30cm土壤有机碳密度为0～100cm的43%左右;而土壤无机碳密度的平均值为7.10kg·m-2,退耕地>典型草原>耕地>干旱半干旱草原,主要分布在下层土壤,50～100cm无机碳密度为0～100cm的58%左右。Chestnut soils are typical zonal soils in semiarid zones. Profile distribution of contents and densities of soil organic and inorganic carbon （SOC and SIC） have been estimated in Chestnut soils. The objective of this study is investigated the distribution of soil carbon in different land use types, and analyzed the causes and forming mechanism of their distinctive distribution characteristics. The estimate was derived from 58 profiles sampled in Wulanchabu County and Xilin River Basin of Inner Mongolia. Profile distribution of SIC mainly has two types： low-high-（low）-（high） and high-low-（high）-（low）, the latter may be induced by soil erosion and carbonate redistribution. The mean SOC density for 100 cm depth column was 8.48kg·m^-2, grass-restored cropland 〉cropland〉 semi-arid and arid pasture〉 typical steppe, intensively accumulated in the topsoil, and the SOC density of 0-30 cm is about 43% larger than that of 0-100 era. The mean SIC density for 100 cm depth column was 7.10kg·m^-2, grass-restored cropland〉typical steppe〉cropland〉 semi-arid and arid pasture, tends to concentrate in deep soils, the SIC density of 50-100 cm is about 58% larger than that of 0-100cm.

关 键 词：栗钙土 土壤有机碳 土壤无机碳 碳含量 碳密度 

分 类 号：S153.6[农业科学—土壤学]