Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau

doi:10.1007/s11368-019-02462-9

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	Different chemical composition and storage mechanism of soil organic matter between active and permafrost layers on the Qinghai-Tibetan Plateau
	Wang, Yinghui ; Xu, Yunping 1; Wei, Dandan 1; Shi, Linlin 1; Jia, Zehua 1; Yang, Yuanhe 2
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2020
卷号	20 期号:2 页码:653-664
关键词	C-13 nuclear magnetic resonance spectroscopy Organic carbon Permafrost Qinghai-Tibet Plateau Warming
ISSN号	1439-0108
DOI	10.1007/s11368-019-02462-9
文献子类	Article
英文摘要	Purpose 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.
学科主题	Environmental Sciences ; Soil Science
电子版国际标准刊号	1614-7480
出版地	HEIDELBERG
WOS关键词	STATE C-13 NMR ; CLIMATE-CHANGE ; VERTICAL-DISTRIBUTION ; MOLECULAR COMPOSITION ; MINERAL ASSOCIATIONS ; MICROBIAL ACTIVITY ; CARBON ISOTOPES ; FOREST SOIL ; STABILIZATION ; DENSITY
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000513281900007
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/21912]
专题	植被与环境变化国家重点实验室
作者单位	1.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
推荐引用方式 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.