亚热带丘陵几种林地土壤剖面有机碳和轻组有机碳的分布  

The Profile of Organic Carbon and Light Fraction Organic Carbon in Several Types of Subtropical Hilly Woodland Soils

作　　者：李洁[1] 盛浩[1] 周萍[2] 袁红[1] 廖超林[1] 黄运湘[1] 张杨珠[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,湖南长沙410125

出　　处：《土壤通报》2013年第4期851-857,共7页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目(31100381;41001141);湖南农业大学引进人才项目(11YJ20)资助

摘　　要：通过选取亚热带丘陵区3种不同母质发育的林地土壤,分析有机碳及轻组有机碳的剖面分布特征。结果表明:土壤有机碳含量(SOC)、轻组有机碳含量(LFOC)和LFOC/SOC均随剖面深度的加深而降低,分别介于1.49～16.80 g kg-1、0.11～2.58 g kg-1和3.2%～20.2%之间,以表层土壤SOC、LFOC的数量最为丰富、质量最高,且各土壤的剖面分布趋势相似。不同母质发育的剖面土壤发生层有机碳储量介于66.66～95.83 t hm-2,以板岩红壤最高,花岗岩红壤最低;而轻组有机碳储量介于6.09～10.37 t hm-2,以板岩红壤最高,紫色土最低。从储量上看,底土层(B、BC、C层)贮存了主要的有机碳和可观的轻组有机碳。此外,亚热带林地表层土壤LFOC/SOC要高于温带林地表层土壤,这反映出气候、地形和当地土地利用方式对土壤碳质量具有重要影响。In the present study, we selected three woodland soils developed from different parent materials in the subtropical hilly region, and evaluated the distribution of contents and storages of SOC and LFOC through the soil profiles. Results showed that the contents of SOC and LFOC and the percentage of LFOC/SOC decreased with the increasing soil depth of the three soils, varying from 1.49 to 16.80 g kg^-1, 0.11 to 2.58 g kg^-1, and 3.2% to 20.2%, respectively. It was indicated that the surface soil layer concentrated larger contents and higher quality of SOC through the whole soil profiles. The SOC stocks ranged from 66.66 to 95.83 thm^-2, with the highest one in the soil derived from argillaceous slate and the lowest one in the soil derived from granite. While the LFOC stocks ranged from 6.09 to 10.37 t hm^-2, with the highest one in the red soil derived from argillaceous slate and the lowest one in purple soil. Evidently, the subsurface soil layers processed the primary stocks of SOC and LFOC throughout the soil profile. In addition, the ratio of LFOC/SOC in the surface forest soil in subtropical region was higher than that of the temperate forest soil, reflecting the great importance of the effect of climate, terrain and the local land use history on soil carbon quality.

关 键 词：母质 紫色土 板岩红壤 花岗岩红壤 有机碳 轻组有机碳 

分 类 号：S151.1[农业科学—土壤学]