Comparing microbial carbon sequestration and priming in the subsoil versus topsoil of a Qinghai-Tibetan alpine grassland

doi:10.1016/j.jplph.2017.03.008

	Comparing microbial carbon sequestration and priming in the subsoil versus topsoil of a Qinghai-Tibetan alpine grassland
	Jia, Juan 1; Feng, Xiaojuan1 ; He, Jin-Sheng ; He, Hongbo 4; Lin, Li 2,3; Liu, Zongguang
	2017
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	104 页码:141-151
摘要	Subsoils of alpine grasslands on the Qinghai-Tibetan Plateau represent a tremendous yet poorly investigated reservoir of soil organic carbon (SOC) on a global hotspot of warming. Compared with the temperature sensitivity of SOC decomposition, microbial anabolism of new carbon and priming of native SOC remain poorly constrained under warming-enhanced labile carbon input in these subsoils. Here we employed an innovative approach to investigate the sequestration of freshly added carbon in microbial necromass versus SOC priming in the top- (0-10 cm) and subsoils (30-40 cm) from a field experiment that simulated varied warming scenarios in an alpine grassland on the Qinghai-Tibetan Plateau. The C-13 composition of microbial necromass-derived amino sugars was analyzed in tandem with respired CO2 and dissolved SOC components (including dissolved lignin) in an 86-day laboratory incubation with C-13-labeled glucose. A higher fraction of freshly added carbon was respired while a smaller proportion was stabilized as amino sugars in the subsoil relative to the topsoil, leading to a much lower microbial carbon accumulation efficiency at depth. Meanwhile, a higher relative priming effect was observed in the subsoil (47 +/- 14%) compared to the topsoil (14 +/- 4%), suggesting a higher vulnerability to substrate-induced SOC loss at depth, although such changes may be associated with higher glucose addition rate (relative to SOC) in the subsoil. Furthermore, enhanced winter warming significantly reduced degradable SOC (assessed by SOC mineralization and dissolved lignin content) in the subsoil and potentially intensified nitrogen limitation under labile carbon additions, which further decreased microbial carbon accumulation (in the form of amino sugars) in the subsoil without affecting the topsoil. These results collectively indicate a limited microbial carbon sequestration potential and a higher vulnerability to warming induced substrate changes in the subsoil of this alpine grassland, which warrants better understanding to predict soil carbon responses to climate warming on the Qinghai-Tibetan Plateau. (C) 2016 Elsevier Ltd. All rights reserved.
关键词	Warming Priming effect Amino sugar C-13 Microbial necromass Carbon accumulation efficiency (CAE) SOC degradability
学科领域	Plant Sciences
DOI	10.1016/j.jplph.2017.03.008
收录类别	SCI
语种	英语
WOS关键词	FUMIGATION-EXTRACTION METHOD ; SOIL ORGANIC-CARBON ; BIOMASS CALIBRATION ; AMINO SUGAR ; MATTER ; DECOMPOSITION ; PLATEAU ; AVAILABILITY ; IMPACTS ; GLUCOSE
WOS记录号	WOS:000404884100014
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1879-3428
资助机构	Chinese National Key Development Program for Basic Research [2014CB954003, 2015CB954201] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31370491, 41422304] ; National Thousand Young Talents recruiting plan of China
作者邮箱	xfeng@ibcas.ac.cn
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22021
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 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China 4.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 5.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jia, Juan,Feng, Xiaojuan,He, Jin-Sheng,et al. Comparing microbial carbon sequestration and priming in the subsoil versus topsoil of a Qinghai-Tibetan alpine grassland[J]. SOIL BIOLOGY & BIOCHEMISTRY,2017,104:141-151.
APA	Jia, Juan,Feng, Xiaojuan,He, Jin-Sheng,He, Hongbo,Lin, Li,&Liu, Zongguang.(2017).Comparing microbial carbon sequestration and priming in the subsoil versus topsoil of a Qinghai-Tibetan alpine grassland.SOIL BIOLOGY & BIOCHEMISTRY,104,141-151.
MLA	Jia, Juan,et al."Comparing microbial carbon sequestration and priming in the subsoil versus topsoil of a Qinghai-Tibetan alpine grassland".SOIL BIOLOGY & BIOCHEMISTRY 104(2017):141-151.

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