Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons

doi:10.1111/gcb.13353

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	Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons
	Wang, Changhui 1; Chen, Zhe ; Unteregelsbacher, Sebastian ; Lu, Haiyan ; Gschwendtner, Silvia 2; Gasche, Rainer ; Kolar, Allison ; Schloter, Michael 2; Kiese, Ralf ; Butterbach-Bahl, Klaus
刊名	GLOBAL CHANGE BIOLOGY
	2016
卷号	22 期号:9
关键词	ammonia-oxidizing archaea ammonia-oxidizing bacteria freeze-thaw frozen soil gross N mineralization gross nitrification montane grassland
ISSN号	1354-1013
DOI	10.1111/gcb.13353
文献子类	Article
英文摘要	The carbon- and nitrogen-rich soils of montane grasslands are exposed to above-average warming and to altered precipitation patterns as a result of global change. To investigate the consequences of climatic change for soil nitrogen turnover, we translocated intact plant-soil mesocosms along an elevational gradient, resulting in an increase of the mean annual temperature by approx. 2 degrees C while decreasing precipitation from approx. 1500 to 1000mm. Following three years of equilibration, we monitored the dynamics of gross nitrogen turnover and ammonia-oxidizing bacteria (AOB) and archaea (AOA) in soils over an entire year. Gross nitrogen turnover and gene levels of AOB and AOA showed pronounced seasonal dynamics. Both summer and winter periods equally contributed to cumulative annual N turnover. However, highest gross N turnover and abundance of ammonia oxidizers were observed in frozen soil of the climate change site, likely due to physical liberation of organic substrates and their rapid turnover in the unfrozen soil water film. This effect was not observed at the control site, where soil freezing did not occur due to a significant insulating snowpack. Climate change conditions accelerated gross nitrogen mineralization by 250% on average. Increased N mineralization significantly stimulated gross nitrification by AOB rather than by AOA. However, climate change impacts were restricted to the 2-6cm topsoil and rarely occurred at 12-16cm depth, where generally much lower N turnover was observed. Our study shows that significant mineralization pulses occur under changing climate, which is likely to result in soil organic matter losses with their associated negative impacts on key soil functions. We also show that N cycling processes in frozen soil can be hot moments for N turnover and thus are of paramount importance for understanding seasonal patterns, annual sum of N turnover and possible climate change feedbacks.
学科主题	Biodiversity Conservation ; Ecology ; Environmental Sciences
电子版国际标准刊号	1365-2486
出版地	HOBOKEN
WOS关键词	AMMONIA-OXIDIZING ARCHAEA ; NITRIFICATION RATES ; N MINERALIZATION ; GAS FLUXES ; TEMPERATURE SENSITIVITY ; MICROBIAL COMMUNITIES ; SPECIES COMPOSITION ; SEMIARID GRASSLAND ; SATURATED SPRUCE ; OXIDE EMISSIONS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	WILEY
WOS记录号	WOS:000381077300004
资助机构	Helmholtz-BMBF TERENO initiative ; BMBF SUSALPS projectFederal Ministry of Education & Research (BMBF) ; FORKAST project of the Bavarian government ; Humboldt PostDoc Fellowship
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/24508]
专题	植被与环境变化国家重点实验室
作者单位	1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res Atmospher Environm Re, D-82467 Garmisch Partenkirchen, Germany 2.Chinese Acad Sci IBCAS, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China 3.German Res Ctr Environm Hlth GmbH, Res Unit Environm Genom, D-85764 Neuherberg, Germany
推荐引用方式 GB/T 7714	Wang, Changhui,Chen, Zhe,Unteregelsbacher, Sebastian,et al. Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons[J]. GLOBAL CHANGE BIOLOGY,2016,22(9).
APA	Wang, Changhui.,Chen, Zhe.,Unteregelsbacher, Sebastian.,Lu, Haiyan.,Gschwendtner, Silvia.,...&Dannenmann, Michael.(2016).Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons.GLOBAL CHANGE BIOLOGY,22(9).
MLA	Wang, Changhui,et al."Climate change amplifies gross nitrogen turnover in montane grasslands of Central Europe in both summer and winter seasons".GLOBAL CHANGE BIOLOGY 22.9(2016).