IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
The significant role of inorganic matters in preservation and stability of soil organic carbon in the Baoji and Luochuan loess/paleosol profiles, Central China
Wang, C (Wang, Chao)[ 1 ]; Li, FC (Li, Fuchun)[ 1 ]; Shi, HZ (Shi, Huanzhi)[ 1 ]; Jin, ZD (Jin, Zhangdong)[ 2 ]; Sun, XH (Sun, Xuhui)[ 1 ]; Zhang, F (Zhang, Fei)[ 2 ]; Wu, F (Wu, Feng)[ 2 ]; Kan, S (Kan, Shang)[ 1 ]
2013-10-30
Source PublicationCATENA
Volume109Pages:186-194
Subtype期刊论文
Abstract

The preservation and stability mechanisms of soil organic carbon (SOC) are the important factors to evaluate the capacity of soil carbon pool and the potential of sustainable utilization. To understand the preservation time and mechanisms of SOC under burial conditions, in the present study, the distributions of total organic carbon (TOC) and stable organic carbon (StOC), and their correlations with the contents of clays and clay minerals and different forms of iron oxides were investigated in the Baoji and Luochuan loess-paleosol profiles. Four facts were observed as the followings. (1) The labile SOC almost was decomposed and the mostly stable SOC was preserved in the loess and paleosol after 375 kyr since their formation. StOC could be preserved at least 762 kyr in both loess and paleosol under burial condition. (2) The TOC was positively correlated with clay contents, with correlation coefficients of 0.72 (Baoji) and 0.63 (Luochuan). (3) The TOC, StOC, mineral-protected organic carbon (MOC), and recalcitrant organic carbon (ROC) were positively correlated with kaolinite, with correlation coefficients of 0.93, 0.72, 0.52, 0.81 (Baoji) and 0.78, 0.58, 0.50, 0.49 (Luochuan), respectively, both with neither illite nor vermiculite. (4) The TOC was highly correlated with complex iron (Fe-p) with correlation coefficients of 0.90 (Baoji) and 0.82 (Luochuan), so with amorphous oxides of iron (Fe-o) as well. Among them, Fe-o mainly affected by sorption and Fe-p by complexation on SOC preservation, whereas kaolinite had both chemical and physical effects. The values of coefficients further highlight that the contributions of inorganic matters to the fixation of organic carbon were ranked to an order of kaolinite > Fe-p > Fe-o.

KeywordSoil Organic Carbon Kaolinite Iron Oxide Clay Particle Loess–paleosol Profile
DOI10.1016/j.catena.2013.04.001
Indexed BySCI
Language英语
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/10001
Collection黄土与第四纪地质国家重点实验室(2010~)
Corresponding AuthorLi, FC (Li, Fuchun)[ 1 ]
Affiliation1.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China
Recommended Citation
GB/T 7714
Wang, C ,Li, FC ,Shi, HZ ,et al. The significant role of inorganic matters in preservation and stability of soil organic carbon in the Baoji and Luochuan loess/paleosol profiles, Central China[J]. CATENA,2013,109:186-194.
APA Wang, C .,Li, FC .,Shi, HZ .,Jin, ZD .,Sun, XH .,...&Kan, S .(2013).The significant role of inorganic matters in preservation and stability of soil organic carbon in the Baoji and Luochuan loess/paleosol profiles, Central China.CATENA,109,186-194.
MLA Wang, C ,et al."The significant role of inorganic matters in preservation and stability of soil organic carbon in the Baoji and Luochuan loess/paleosol profiles, Central China".CATENA 109(2013):186-194.
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