ISWC OpenIR  > 水保所2018--届毕业生论文
The distribution of organic carbon fractions in a typical loess-paleosol profile and its paleoenvironmental significance
Zhang Qingqing2,3; Huang Jinghua1,2; Hu Feinan1,2; Huo Na1; Shang Yingni1; Chang Wenqian1; Zhao Shiwei1,2
2018-04-13
Source PublicationPeer J
description.correspondentemailswzhao@ms.iswc.ac.cn
Issue6Pages:e4611
Abstract
Background. The loess-paleosol sequence on the Loess Plateau has been considered an
important paleoclimatic archive to study global climatic and environmental changes in
the Quaternary. So far, little attention has been paid to the characteristics of soil organic
carbon fractions in loess-paleosol sequences, which may provide valuable information
for exploring the evolution of climate and environment in the Quaternary on the Loess
Plateau.
Methods. In order to explore the significance of mineral-associated organic carbon to
total organic carbon (MOC/TOC) ratios in the loess-paleosol sequence for reconstruct-
ing paleoenvironmental and paleoclimatic evolution in the Quaternary on the Loess
Plateau, we selected a typical loess-paleosol profile in Chunhua county, Xianyang city,
Shaanxi province, as the research object. The content of total organic carbon (TOC)
and MOC/TOC ratio in each loess and paleosol layers of the Chunhua loess-paleosol
profile were analyzed, together with the paleoclimatic proxies, such as soil grain size,
CaCO3 content and their correlations with organic carbon parameters.
Results. The main results were as follows: (1) the total content of soil organic carbon
and MOC/TOC ratios were generally higher in paleosol layers than in the underlying
loess layers of the Chunhua loess-paleosol profile. Compared to total organic carbon
content, MOC/TOC ratios changed more obviously in soil layers below a paleosol layer
S8; (2) soil clay content and median grain size (Md ()) were higher in paleosol than
in the underlying loess, while CaCO3 content showed an opposite tendency. In the
Chunhua profile, the distribution characteristics of the three paleoclimatic proxies
showed good indications of paleoclimate changes in the Quaternary; (3) in the Chunhua
loess-paleosol profile, MOC/TOC ratios were positively correlated with clay content
and median grain size (), while negatively correlated with CaCO3 content, and the
correlations were more significant in soil layers below S8.
Discussion. Our results indicated that MOC/TOC ratios in the Chunhua loess-paleosol
profile correlated with the cold dry-warm wet paleoclimatic cycle in the Quaternary.
The high MOC/TOC ratios in the loess-paleosol profile might reflect warm and humid climate, while lower ratios indicated relatively cold and dry climate. That is because
when the climate changed from warm-humid to cold-dry, the vegetation coverage and
pedogenesis intensity decreased, which increased soil CaCO3 content and decreased soil
clay content and Md (), leading to decreased MOC/TOC ratios. Compared to TOC,
MOC/TOC ratios had greater significance in indicating paleoenvironmental evolution
in the Quaternary on the Loess Plateau. Therefore, investigating MOC/TOC ratios in
loess-paleosol profile can offer new evidence to reconstructing paleoenvironmental
changes, and also provide a basis for predicting responses of soil organic carbon pools
to vegetation and climate changes in the future.
KeywordThe Chunhua Loess-paleosol Sequence Grain Size Paleoclimate Moc/toc Caco3
Subject Area农学
DOI10.7717/peerj.4611
Indexed BySCI
Language英语
Funding OrganizationThis work was supported by the National Science Foundation of China (No.31500449), West Light Foundation of the Chinese Academy of Sciences (No.XAB2015B05), Open Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources (No.A314021402-1515), and the Fundamental Research Funds for the Central Universities (No.2452016101). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. ; This work was supported by the National Science Foundation of China (No.31500449), West Light Foundation of the Chinese Academy of Sciences (No.XAB2015B05), Open Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources (No.A314021402-1515), and the Fundamental Research Funds for the Central Universities (No.2452016101). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8122
Collection水保所2018--届毕业生论文
Corresponding AuthorZhao Shiwei
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University
2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources
3.University of Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Qingqing,Huang Jinghua,Hu Feinan,et al. The distribution of organic carbon fractions in a typical loess-paleosol profile and its paleoenvironmental significance[J]. Peer J,2018(6):e4611.
APA Zhang Qingqing.,Huang Jinghua.,Hu Feinan.,Huo Na.,Shang Yingni.,...&Zhao Shiwei.(2018).The distribution of organic carbon fractions in a typical loess-paleosol profile and its paleoenvironmental significance.Peer J(6),e4611.
MLA Zhang Qingqing,et al."The distribution of organic carbon fractions in a typical loess-paleosol profile and its paleoenvironmental significance".Peer J .6(2018):e4611.
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