IB-CAS  > 植被与环境变化国家重点实验室
Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau
Wang, Yinghui; Xu, Yunping1; Wei, Dandan1; Shi, Linlin1; Jia, Zehua1; Yang, Yuanhe2
2020
Source PublicationJOURNAL OF SOILS AND SEDIMENTS
ISSN1439-0108
Volume20Issue:2Pages:653-664
AbstractPurpose Although many studies have paid attention to the storage and dynamics of organic carbon (OC) in the Arctic permafrost, there are limited reports for low-latitude alpine permafrost ecosystems like Qinghai-Tibet Plateau (QTP). The aims of this study are to (1) reveal the vertical distribution of OC stocks in permafrost soils; (2) assess the storage and transformation of permafrost OC; and (3) disentangle the effect of mineral protection on OC storage in permafrost soils. Materials and methods A 2-m permafrost profile on the QTP was investigated to understand vertical distribution of organic matter (OM) in different density fractions based on elemental composition, carbon stable isotope (delta C-13), mineral grain size, Fe and Al concentrations, and solid-state C-13 nuclear magnetic resonance spectroscopy (C-13 NMR). Results and discussion A positive relationship between light fraction organic carbon (LOC) and root abundance indicates that root is an important contributor for LOC. However, in heavy fractions, the total organic carbon to total nitrogen ratio (TOC/TN) is significantly lower than that in light fractions. This, combined with a negative correlation between TOC/TN and heavy fraction organic carbon (HOC), indicates that microbial input affects the quantity of HOC. In the active layer, the downward decreased delta C-13, elevated alkyl/O-alkyl, and decreased ratio of 70-75:52-57 ppm suggest selected decomposition of carbohydrate components. While in the deep permafrost layer, the relatively constant delta C-13 values and chemical composition of OM suggest a stable environment and minor impact of cryoturbation. The redundancy analysis shows that soil textures and concentration of Fe and Al have weak correlations with OC content, but for deep permafrost soils only, fine soil fraction is associated with aromatic carbon, and Al has strong influence on alkyl carbon, which could be attributed to OM-mineral stabilization. Conclusions Our results suggest that soil textures and Fe and Al concentration affect SOM preservation in the permafrost soils on the QTP; however, they largely control the quality rather than quantity of OM.
KeywordC-13 nuclear magnetic resonance spectroscopy Organic carbon Permafrost Qinghai-Tibet Plateau Warming
Subject AreaEnvironmental Sciences ; Soil Science
DOI10.1007/s11368-019-02462-9
Indexed BySCI
Language英语
WOS KeywordSTATE C-13 NMR ; CLIMATE-CHANGE ; VERTICAL-DISTRIBUTION ; MOLECULAR COMPOSITION ; MINERAL ASSOCIATIONS ; MICROBIAL ACTIVITY ; CARBON ISOTOPES ; FOREST SOIL ; STABILIZATION ; DENSITY
WOS Research AreaEnvironmental Sciences & Ecology ; Agriculture
WOS IDWOS:000513281900007
PublisherSPRINGER HEIDELBERG
SubtypeArticle
Publication PlaceHEIDELBERG
EISSN1614-7480
Corresponding Author Emailypxu@shou.edu.cn
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ibcas.ac.cn/handle/2S10CLM1/21912
Collection植被与环境变化国家重点实验室
Affiliation1.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China
2.Shanghai Ocean Univ, Coll Marine Sci, Shanghai 201306, Peoples R China
3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yinghui,Xu, Yunping,Wei, Dandan,et al. Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau[J]. JOURNAL OF SOILS AND SEDIMENTS,2020,20(2):653-664.
APA Wang, Yinghui,Xu, Yunping,Wei, Dandan,Shi, Linlin,Jia, Zehua,&Yang, Yuanhe.(2020).Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau.JOURNAL OF SOILS AND SEDIMENTS,20(2),653-664.
MLA Wang, Yinghui,et al."Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau".JOURNAL OF SOILS AND SEDIMENTS 20.2(2020):653-664.
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