Sources of dissolved organic carbon in forest soils: evidences from the differences of organic carbon concentration and isotope composition studies

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	Sources of dissolved organic carbon in forest soils: evidences from the differences of organic carbon concentration and isotope composition studies
	Cong-Qiang Liu; Cheng-Long Tu; Xiao-Hui Lu; Ju Yuan; Yun-Chao Lang
刊名	Environmental Earth Sciences
	2011
卷号	63 期号:4 页码:723-730
英文摘要	There is considerable discussion and uncertainty in the literature regarding the importance of fresh litter versus older soil organic matter as sources of soil dissolved organic carbon (DOC) in forest floor. In this study, the differences of organic carbon concentration and stable isotope composition were analyzed under different background conditions to identify the origins of DOC in forest soil. The data show that there is no significant difference in SOC content between these collected soil samples (P[0.05), but the litter-rich surface soils have relatively higher DOC concentration than the litter-lacking (P\0.01) ones, and the d13C values of DOC (d13CDOC) are closer to d13C of litter than d13C values of SOC (d13CSOC). In the litter-lacking surface soil samples, the range of d13CDOC is between d13CSOC and d13C of dominant plant leaves. These results suggest that DOC mainly derive from litter in the litter-rich surface soil with, and the main path of DOC sources may change with surrounding conditions. In addition, d13CSOC and d13CDOC become more positive, and the absolute values of D (d13CDOC - d13CSOC) decrease with depth in the soil profiles, which indicate that the percentage of DOC below 5 cm, derived from degradation of humus, may increase with soil depth.
学科主题	环境地球化学
语种	英语
公开日期	2017-12-28
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6982]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Cong-Qiang Liu,Cheng-Long Tu,Xiao-Hui Lu,et al. Sources of dissolved organic carbon in forest soils: evidences from the differences of organic carbon concentration and isotope composition studies[J]. Environmental Earth Sciences,2011,63(4):723-730.
APA	Cong-Qiang Liu,Cheng-Long Tu,Xiao-Hui Lu,Ju Yuan,&Yun-Chao Lang.(2011).Sources of dissolved organic carbon in forest soils: evidences from the differences of organic carbon concentration and isotope composition studies.Environmental Earth Sciences,63(4),723-730.
MLA	Cong-Qiang Liu,et al."Sources of dissolved organic carbon in forest soils: evidences from the differences of organic carbon concentration and isotope composition studies".Environmental Earth Sciences 63.4(2011):723-730.