globalchange  > 气候减缓与适应
DOI: 10.1007/s10584-017-1987-z
Scopus记录号: 2-s2.0-85019562746
论文题名:
Variations of N2O fluxes in response to warming and cooling in an alpine meadow on the Tibetan Plateau
作者: Hu Y.; Zhang Z.; Wang Q.; Wang S.; Zhang Z.; Wang Z.; Xu G.; Du M.; Dijkstra F.A.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2017
卷: 143, 期:2018-01-02
起始页码: 129
结束页码: 142
语种: 英语
Scopus关键词: Climate change ; Moisture ; Soil moisture ; Soils ; Temperature ; Above ground biomass ; Climate warming ; Elevation gradient ; Qilian mountains ; Soil atmosphere ; Soil temperature ; Tibetan Plateau ; Vegetation type ; Vegetation ; aboveground biomass ; alpine environment ; climate change ; cooling ; growing season ; meadow ; nitrous oxide ; soil temperature ; vegetation type ; warming ; China ; Qinghai-Xizang Plateau
英文摘要: Little is known about the impacts of climate change especially for cooling on N2O emissions from alpine meadows on the Tibetan Plateau. Along a slope of Qilian mountains, China, we transferred intact soil cores covering different vegetation types (graminoid, shrub, forb, and sparse vegetation) downhill (warming) and uphill (cooling) across a 600-m elevation gradient to examine the responses of soil-atmosphere N2O exchange rates to climate warming and cooling. N2O fluxes were measured during two growing seasons from May to October in 2008 and 2009. The Tibetan alpine meadow acted as a net N2O source at an average rate of 5.2 μg m−2 h−1 (ranging from 2.0 to 11.5 μg m−2 h−1). In situ N2O emission generally decreased with elevation increase except for sparse vegetation, but significant differences were only found between graminoid and other three vegetations in 2008 and between graminoid and shrub vegetation in 2009. Warming averagely increased mean N2O fluxes by 219% (ranging from 126 to 287%) while cooling decreased it by 75% (ranging from 57 to 95%) across four vegetation types over the variation of soil temperature from 1.3 to 5.5 °C. However, opposite effects were also observed in some cases due to modification of variations in soil moisture. Soil temperature and moisture had a positive effect on N2O fluxes and explained 48 and 26% of the variation in mean N2O fluxes across the four vegetation types, respectively. No relationship was found between mean N2O fluxes and aboveground biomass. Our results suggest that more N2O-N would be released from soil in a warmer future and that less N2O emission during cool and dry years is expected in the Tibetan alpine meadow. © 2017, Springer Science+Business Media Dordrecht.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83982
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, China; Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, China; Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; CAS Center for Excellence in Tibetan Plateau Earth Science, Beijing, China; Guangxi Institute of Botany, Chinese Academy of Sciences, Guilin, China; National Institute for Agro-Environmental Sciences, Tsukuba, Japan; Centre for Carbon, Water and Food, School of Environmental and Life Sciences, The University of Sydney, Camden, NSW, Australia

Recommended Citation:
Hu Y.,Zhang Z.,Wang Q.,et al. Variations of N2O fluxes in response to warming and cooling in an alpine meadow on the Tibetan Plateau[J]. Climatic Change,2017-01-01,143(2018-01-02)
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