Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau

doi:10.1016/j.agee.2017.12.003

NWIPB OpenIR

	Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau
	Fu, Yongfeng 1,2; Liu, Chunyan 1; Lin, Fei 1,2; Hu, Xiaoxia 1,2; Zheng, Xunhua 1,2; Zhang, Wei 1; Ca, Guangmin 3
	2018-03-01
发表期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
卷号	255 页码:27-36
文章类型	Article
摘要	Alpine meadows are the largest grasslands in China. Greenhouse gas exchanges between alpine meadows and the atmosphere are highly uncertain due to the lack of year-round flux measurements. In this study, the methane (CH4) and nitrous oxide (N2O) fluxes in an alpine Potentilla fruticosa shrub meadow in the Qinghai-Tibetan Plateau were investigated using the static, opaque chamber-gas chromatography method between April 2012 and April 2015. The annual CH4 uptake (1.33-1.35 kg C ha(-1) yr(-1)) and Q(10), value (1.79) were at the low end of the range for natural grasslands in China, which indicated that global warming at the same extent would result in less of an increase in the CH4 sink in the Qinghai-Tibetan Plateau, compared to other grassland areas. The N2O emissions during the spring thaw period showed a tremendous inter-annual variation (0.03 to 0.14 kg N ha(-1)), which was closely linked to the variation in annual precipitation, especially the precipitation of the previous growing season. The high substrate concentrations and soil moisture during the spring thaw periods together provided the conditions for pulse N2O emissions. When the pulse N2O emissions occurred, emissions from the non-growing seasons dominated (67-74%) the annual total emissions. Thus, a proper sampling frequency (daily to weekly measurements) in non-growing seasons was needed for the quantification of annual fluxes. Four gas chromatographic set-ups (the Ar-CH4, N-2-ascarite, N-2-CO2, and pure N-2 methods) were adopted for N2O flux measurements over natural grasslands in China. Using the N-2-CO2 method, the annual N2O emissions from the alpine shrub meadow were quantified to be only 0.18-0.27 kg N ha(-1) yr(-1) in the present study. Based on measurements using the first three of the four gas chromatographic set-ups, the conclusion that can be drawn is that unfertilized natural grasslands in China function as marginally weak N2O sources, whereas the pure N-2 method may remarkably overestimate the emissions.
关键词	Gas Chromatography Carrier Gas Nitrous Oxide Spring Thaw The Qinghai-tibetan Plateau
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
DOI	10.1016/j.agee.2017.12.003
关键词[WOS]	INNER MONGOLIAN STEPPE ; N2O FLUXES ; NORTHERN CHINA ; AGROPASTORAL ECOTONE ; POTENTILLA-FRUTICOSA ; CARBON-DIOXIDE ; LAND USES ; EMISSIONS ; SOIL ; CH4
收录类别	SCI
语种	英语
项目资助者	National Natural Science Foundation of China(41375152 ; Ministry of Science and Technology(2016YFA0602303 ; 41603075) ; 2016YFA0600804)
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS记录号	WOS:000425578600004
引用统计	被引频次：32[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/13320
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Fu, Yongfeng,Liu, Chunyan,Lin, Fei,et al. Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2018,255:27-36.
APA	Fu, Yongfeng.,Liu, Chunyan.,Lin, Fei.,Hu, Xiaoxia.,Zheng, Xunhua.,...&Ca, Guangmin.(2018).Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,255,27-36.
MLA	Fu, Yongfeng,et al."Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 255(2018):27-36.