Effects of grazing on CO2, CH4, and N2O fluxes in three temperate steppe ecosystems

doi:10.1186/s12870-017-1160-x

	Effects of grazing on CO2, CH4, and N2O fluxes in three temperate steppe ecosystems
	Shi, Huiqiu 1; Hou, Longyu ; Yang, Liuyi 1; Wu, Dongxiu ; Zhang, Lihua ; Li, Linghao
	2017
发表期刊	ECOSPHERE
ISSN	2150-8925
卷号	8 期号:4
摘要	Terrestrial ecosystems play a critical role in regulating the emission and uptake of the most important greenhouse gases (GHGs) such as CO2, CH4, and N2O. However, the effects of grazing on these GHG fluxes in different steppe types remain unclear. Here, we compared the effects of grazing on seasonal CO2, CH4, and N2O fluxes in the meadow (MS), typical (TS), and desert (DS) temperate steppe ecosystems in northern China. CO2 emission rates increased from 311.4 +/- 73.2 to 349.6 +/- 55.4 mg.m(-2).h(-1) in MS, but decreased in TS (from 341.3 +/- 93.0 to 239.5 +/- 81.9 mg.m(-2).h(-1)) and DS ( from 212.1 +/- 53.7 to 163.0 +/- 83.4 mg.m(-2).h(-1)) in response to summer grazing (SG). N2O emission rates increased in MS from 4.7 +/- 2.2 to 8.1 +/- 3.4 mu g.m(-2).h(-1), but not significantly changed in TS (9.2 +/- 4.2 vs. 8.4 +/- 2.4 mu g.m(-2).h(-1)) and DS (6.3 +/- 1.5 vs. 5.7 +/- 1.6 mu g.m(-2).h(-1)) by SG. CH4 uptake rates increased in MS from 33.0 +/- 11.7 to 47.1 +/- 10.4 mu g.m(-2).h(-1) and decreased from 64.4 +/- 7.6 to 56.2 +/- 5.9 mu g.m(-2).h(-1) in TS in response to SG. In MS and DS, N2O emissions were positively related to seasonal CO2 emissions and negatively related to CH4 uptakes. No significant relationships were found between GHG fluxes in TS. Summer grazing did not affect the relationship between CO2 and N2O emissions in MS, but reduced the relationship by enhancing the effect of aboveground biomass (AGB) on N2O emission in DS. The significant negative relationship between CH4 uptake and N2O emission in MS and DS could be attributed to the significant relationship between soil temperature (ST) and AGB in MS and to the significant effects of soil moisture on both CH4 uptake and N2O emission in DS. The decrease in the magnitude of the correlation coefficients between CH4 uptake and N2O emission by SG was due to the negative relationship between ST and AGB simultaneously in MS and DS. Our results suggest that effects of SG on GHG fluxes varied in different steppes and the relationship among GHGs was steppe-dependent and SG also changed the relationship by affecting GHG fluxes induced by varied soil and environmental factors.
关键词	grassland grazing greenhouse gases relationship
学科领域	Plant Sciences
DOI	10.1186/s12870-017-1160-x
收录类别	SCI
语种	英语
WOS关键词	NITROUS-OXIDE EMISSIONS ; SOIL RESPIRATION ; INNER-MONGOLIA ; METHANE UPTAKE ; ATMOSPHERIC METHANE ; LEYMUS-CHINENSIS ; SEMIARID STEPPE ; GROWING-SEASON ; TYPICAL STEPPE ; CARBON-DIOXIDE
WOS记录号	WOS:000416263400002
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41273090, 31130008, 31229001] ; National Key Research and Development Plan [2016YFC0500600]
作者邮箱	llinghao@ibcas.ac.cn
作品OA属性	Green Published, gold
引用统计	被引频次：43[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/2S10CLM1/22331
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 100049, Peoples R China
推荐引用方式 GB/T 7714	Shi, Huiqiu,Hou, Longyu,Yang, Liuyi,et al. Effects of grazing on CO2, CH4, and N2O fluxes in three temperate steppe ecosystems[J]. ECOSPHERE,2017,8(4).
APA	Shi, Huiqiu,Hou, Longyu,Yang, Liuyi,Wu, Dongxiu,Zhang, Lihua,&Li, Linghao.(2017).Effects of grazing on CO2, CH4, and N2O fluxes in three temperate steppe ecosystems.ECOSPHERE,8(4).
MLA	Shi, Huiqiu,et al."Effects of grazing on CO2, CH4, and N2O fluxes in three temperate steppe ecosystems".ECOSPHERE 8.4(2017).

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