Experimental warming increased soil nitrogen sink in the Tibetan permafrost

doi:10.1038/s41467-017-02034-w

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	Experimental warming increased soil nitrogen sink in the Tibetan permafrost
	Chang, Ruiying ; Wang, Genxu ; Yang, Yuanhe 2; Chen, Xiaopeng
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
	2017
卷号	122 期号:7 页码:1870-1879
关键词	nitrogen isotope permafrost soil cryoturbation openness of N cycle soil aggregate Qinghai-Tibetan Plateau
ISSN号	2169-8953
DOI	10.1038/s41467-017-02034-w
文献子类	Article
英文摘要	In permafrost soil, warming regulates the nitrogen (N) cycle either by stimulating N transformation or by enhancing cryoturbation, the mixture of soil layers due to repeated freeze thaw. Here N isotopic values (N-15) of plants and the soil were investigated in a 7year warming experiment in a permafrost-affected alpine meadow on the Qinghai-Tibetan Plateau. The results revealed that warming significantly decreased the N-15 in the plant (aboveground and belowground parts) and different soil fractions (clay and silt fraction, aggregate, and bulk soil). The decreased soil N-15 was associated with an increase in soil N stock due to greater N fixation. The incremental N retention in plants and soil mineral-associated fractions from warming resulted in a decrease in soil inorganic N, which constrains the role of nitrification/denitrification in soil N-15, suggesting a restrained rather than an open N cycle. Furthermore, enhanced cryoturbation under warming, identified by a downward redistribution of Cs-137 into deeper layers, promoted N protection from transformation. Overall, the decrease in soil N-15 indicated higher rates of N input through fixation relative to N loss through nitrification and denitrification in permafrost-affected ecosystems under warming conditions.
学科主题	Science & Technology - Other Topics
电子版国际标准刊号	2169-8961
出版地	WASHINGTON
WOS关键词	LITTER ADDITION ; ORGANIC-CARBON ; ALPINE MEADOW ; ECOSYSTEM ; FIXATION ; TUNDRA ; METAANALYSIS ; RESPONSES ; PLATEAU ; FLUXES
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000417467100006
资助机构	National Basic Research Program of ChinaNational Basic Research Program of China [2013CBA01807] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41671206, 91547203]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/22064]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolvement & Regulat, Chengdu, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Chang, Ruiying,Wang, Genxu,Yang, Yuanhe,et al. Experimental warming increased soil nitrogen sink in the Tibetan permafrost[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2017,122(7):1870-1879.
APA	Chang, Ruiying,Wang, Genxu,Yang, Yuanhe,&Chen, Xiaopeng.(2017).Experimental warming increased soil nitrogen sink in the Tibetan permafrost.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,122(7),1870-1879.
MLA	Chang, Ruiying,et al."Experimental warming increased soil nitrogen sink in the Tibetan permafrost".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 122.7(2017):1870-1879.