Soil extractable organic C and N contents, methanotrophic activity under warming and degradation in a Tibetan alpine meadow

doi:10.1016/j.agee.2019.03.020

	Soil extractable organic C and N contents, methanotrophic activity under warming and degradation in a Tibetan alpine meadow
	Gu, Xinyun 1; Zhou, Xiaoqi 1; Bu, Xuelei 1; Xue, Mengdi 1; Jiang, Lili 8; Wang, Shiping 7,8; Hao, Yanbin 6; Wang, Yanfen 6; Xu, Xingbang 5; Wang, Guojie 4
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2019-06-01
卷号	278 页码:6-14
关键词	Warming Degradation Extractable organic C Extractable organic N Methanotrophic activity Alpine meadow
ISSN号	0167-8809
DOI	10.1016/j.agee.2019.03.020
通讯作者	Zhou, Xiaoqi(xqzhou@des.ecnu.edu.cn)
英文摘要	The Tibetan alpine meadow ecosystem is an important part of the Eurasian grasslands and is experiencing intense warming at approximately three times the global warming rate and rapid degradation. However, little is known about the effect of warming and degradation and their interactions on ecosystem functions like soil carbon (C) and nitrogen (N) pools and methane (CH4) uptake in this region. Here, we selected a long-term simulated warming site in a Tibetan alpine meadow with different degradation levels. After 4 years of warming, we analyzed soil total C (TC) and total N (TN) contents, extractable organic C (EOC) and extractable organic N (EON) contents as well as methanotrophic activity, abundance and community structure. Soil EOC and EON contents were measured through hot water extraction, whereas methanotrophic activity was measured along a gradient of CH4 concentrations in laboratory incubations. Michaelis-Menten kinetics analysis [maximal rate of velocity (V-max) and half-saturation constant (K-m)] was used to quantify changes in methanotrophic activity among the treatments. Active methanotrophic communities in the natural soils were measured via DNA-based stable isotope probing (SIP). The results showed that warming significantly increased soil EON contents, whereas degradation significantly decreased soil TC and TN contents, and EOC and EON contents. Methanotrophic activity was significantly lower at different levels of degradation but no significant effects were observed under warming. Changes in soil methanotrophic abundance among the treatments followed the same trend, but warming and degradation had no interactive effects on methanotrophic activity and abundance. Active methanotrophic communities in the natural meadow soils were dominated by Merhylosinus (a Type II methanotroph). In conclusion, our results indicate that soil C and N pools and CH4 oxidation capability were influenced more strongly by degradation than warming. However, warming may have an additional effect on the stability of these important ecosystem processes, regardless of degradation in this region.
资助项目	National Natural Science Foundation of China[41731175] ; National Natural Science Foundation of China[31672474] ; Shanghai Science and Technology Innovation Fund[18391902300] ; Fundamental Research Funds for the Central Universities
WOS关键词	ATMOSPHERIC METHANE ; COMMUNITY STRUCTURE ; BIOGEOCHEMICAL CYCLES ; MICROBIAL COMMUNITY ; OXIDIZING BACTERIA ; RIBOSOMAL-RNA ; CARBON ; GRASSLAND ; NITROGEN ; OXIDATION
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000482173500002
资助机构	National Natural Science Foundation of China ; Shanghai Science and Technology Innovation Fund ; Fundamental Research Funds for the Central Universities
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/69647]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhou, Xiaoqi
作者单位	1.East China Normal Univ, Sch Ecol & Environm Sci, Ctr Global Change & Ecol Forecasting, Zhejiang Tiantong Forest Ecosyst Natl Observat &, Shanghai 200241, Peoples R China 2.Scion, POB 29237, Christchurch 8440, New Zealand 3.Thunen Inst Biodivers, Fed Res Inst Rural Areas Forestry & Fisheries, D-38116 Braunschweig, Germany 4.EOARC, Badgley Hall 205D,1 Univ Blvd, La Grande, OR 97850 USA 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 8.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Gu, Xinyun,Zhou, Xiaoqi,Bu, Xuelei,et al. Soil extractable organic C and N contents, methanotrophic activity under warming and degradation in a Tibetan alpine meadow[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2019,278:6-14.
APA	Gu, Xinyun.,Zhou, Xiaoqi.,Bu, Xuelei.,Xue, Mengdi.,Jiang, Lili.,...&Clinton, Peter W..(2019).Soil extractable organic C and N contents, methanotrophic activity under warming and degradation in a Tibetan alpine meadow.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,278,6-14.
MLA	Gu, Xinyun,et al."Soil extractable organic C and N contents, methanotrophic activity under warming and degradation in a Tibetan alpine meadow".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 278(2019):6-14.