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delta C-13 Characteristics of Soil Organic Carbon in Hilly Karst Area

文献类型： 外文期刊

作者： Li, Qiang 2 ; Li, Zhongyi 3 ; Liang, Jianhong 1 ; He, Yuanyuan 1 ; Cao, Jianhua 1 ; Hu, Qingjing 1 ;

作者机构： 1.CAGS, Inst Karst Geol, Karst Dynam Lab, MLR & Guangxi, Guilin 541004, Peoples R China

2.Southwest Univ, Sch Geog Sci, Chongqing 400715, Peoples R China

3.Guangxi Acad Agr Sci, Agr Resource & Environm Res Inst, Nanning 530007, Peoples R China

4.Guangxi Univ, Nanning 530004, Peoples R China

关键词： SOC;stable carbon isotope;karst area;geomorphological effect;Nanchuan Chongqing

期刊名称：POLISH JOURNAL OF ENVIRONMENTAL STUDIES （ 影响因子：1.699； 五年影响因子：1.654 ）

ISSN： 1230-1485

年卷期： 2014 年 23 卷 6 期

页码：

收录情况： SCI

摘要： To understand the effects of geomorphology and environment on the C-13 character of soil organic carbon (SOC) in a hilly karst area, 26 soil samples were collected in 2008 in Nanchuan, Chongqing, SW China. The results showed that the delta C-13-SOC values were between 48.66 parts per thousand similar to 27.41%, with the mean value of -23.3 parts per thousand The data firmly indicated that the modern soil organic carbon was the mixture of C3 and C4 plants and mainly originated from C3 plants rather than C4 plants. According to the sequence of delta C-13-SOC along the geomorphological change at this hilly karst area, it can be seen that the PC-SOC values was the crest > brae > foot. Based on the results of correlation analysis, the positive correlation between the delta C-13-SOC values and their altitude is 0.432 (p=0.028), which reflects the land/soil degradation effects caused by the hilly geomorphology, especially in the water and soil erosion process.

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