鄂西南区域土壤有机碳储量、密度及其影响因子  

Study on soil organic carbon storage,density,and their impact factors based on region scale in southwest Hubei,China

作　　者：陈建国[1,2,3] 田大伦[1,2,3] 闫文德[1,2,3] 项文化[1,2,3] 方晰[1,2,3] 

机构地区：[1]中南林业科技大学生命科学与技术学院,湖南长沙410004 [2]南方林业生态应用技术国家工程实验室,湖南长沙410004 [3]国家野外科学研究站,湖南会同418307

出　　处：《中南林业科技大学学报》2011年第5期57-62,共6页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项(201104009);国家野外科学观测研究站项目(2010-05);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局创新平台项目(K1003009-61);中南林业科技大学人才引进基金(104-0116)

摘　　要：以鄂西南来凤县土壤有机碳为研究对象,对来凤县区域土壤有机碳储量及密度进行了研究。研究结果表明:该县域内土壤有机碳储量主要分布于海拔500～800m的中山地带,其次是高于海拔800m的中高山地带,最低的则是低于海拔500m低山地带;区域内0～100cm土层平均有机碳密度为5.38kg/m2,远低于全国平均水平(11.41kg/m2);随着海拔的升高,土壤有机碳密度在0～20cm表层降低,在0～100cm土层升高;土壤成土母质对0～20cm土层土壤有机碳密度无显著影响,对0～100cm土层的则影响显著。此外,土壤有机碳密度受人为干扰影响较大,人类干扰程度小的山地土壤有机碳密度与年均气温、年均降水量关联度最大,其次为人类干扰程度较大的旱耕地,人类干扰程度最大的水田最小,其土壤有机碳密度与年均气温、年均降水量均不相关。The soil organic carbon storage and density were investigated in Laifeng county,in southwest Hubei.The results show that the main part of soil organic carbon storage was distributed in the zone of altitude of 500～800 meters in Laifeng county,the second was in that above altitude of 800 meters,and the smallest was in that under altitude of 500 meters,and the soil organic carbon density in the region was 5.38 kg/m2,which was substantially lower than the national level（11.41 kg/m2）.As the altitude increases,the soil organic carbon density increased in soil horizon of 0～100 cm,but decreased in that of 0～20 cm.In addition,the soil mother material impacted unsignificantly to soil organic density in the soil horizon of 0～20 cm,but significantly in that of 0～100 cm.Furthermore,the soil organic carbon density was affected markedly by human cultivation manner： the correlation coefficient among the organic carbon density,annual average temperature and the annual average precipitation was highest in hilly zone that impacted little by human,second in dry arable land impacted more heavily,and lowest in paddy field impacted most heavily,in which the soil organic carbon density wasn＇t relevant to the annual average temperature and precipitation.

关 键 词：鄂西南 有机碳储量 有机碳密度 

分 类 号：S153.62[农业科学—土壤学]