南方丘陵区三种母质水耕人为土有机碳的累积特征与影响因素分析  

Accumulation of Soil Organic Carbon and Their Influencing Factors of Hydragric Anthrosols in Hilly Regions of South China

作　　者：韩光中[1,2] 张甘霖[2] 李德成[2] 

机构地区：[1]内江师范学院地理与资源科学学院,四川内江641112 [2]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

出　　处：《土壤》2013年第6期978-984,共7页Soils

基　　金：国家自然科学基金项目(No.41071142);中国科学院知识创新项目(KZCX2-EW-405)资助

摘　　要：本研究分析了南方丘陵区3种母质水耕人为土有机碳的累积特征与影响因素。结果表明:紫色砂页岩和第四纪红黏土母质的水耕人为土在发育过程中有机碳较易累积,在种稻初期土壤有机碳的增加主要集中在耕作层,到一定阶段后下层(耕作层以下)也明显增加;相比之下,红砂岩母质的水耕人为土在发育过程中有机碳较难累积。利用逐步回归方法得到的丘陵区水耕人为土耕作层有机碳动态变化模型表明丘陵区水耕人为土有机碳的动态变化主要受细颗粒(黏粒+细粉粒)的影响。Three Hydragric Anthrosols chronosequences, respectively derived from purple sand shale, quaternary red clays and red sandstone in hilly regions of South China, were studied to assess the dynamic changes of soil organic carbon （SOC）. The results indicated that SOC was easily accumulated in Hydragric Anthrosols derived from purple sandstone soil and quaternary red clay soils, and mainly accumulated in anthrostagnic epipedon at the initial cultivation stage followed by subsoilsm but SOC was hardly accumulated in Hydragric Anthrosols origined from red sandstone soil. The exploratory model derived from stepwise multiple regression procedure for estimating SOC of the cultivated horizon in Hydragric Anthrosols proved that SOC accumulation were mainly affected by soil particle size composition.

关 键 词：水耕人为土 时间序列 有机碳 土壤颗粒组成 

分 类 号：S151.3[农业科学—土壤学]