DOI: 10.1111/gcb.12318
论文题名: Soil-plant N processes in a High Arctic ecosystem, NW Greenland are altered by long-term experimental warming and higher rainfall
作者: Schaeffer S.M. ; Sharp E. ; Schimel J.P. ; Welker J.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 11 起始页码: 3529
结束页码: 3539
语种: 英语
英文关键词: Carbon
; Climate change
; Global warming
; Mineralization
; Nitrification
; Nitrogen
; Polar semidesert
; Precipitation
; Stable isotopes
Scopus关键词: air temperature
; biogeochemical cycle
; carbon cycle
; carbon sequestration
; climate change
; desert
; global change
; global warming
; microbial activity
; mineralization
; nitrification
; nitrogen cycle
; plant
; precipitation (climatology)
; rainfall
; soil nitrogen
; stable isotope
; summer
; tundra
; Arctic
; Greenland
; carbon
; diltiazem
; fluoride varnish
; nitrogen
; rain
; water
; Arctic
; article
; chemistry
; climate change
; greenhouse effect
; Greenland
; metabolism
; microbiology
; mineralization
; nitrification
; plant leaf
; polar semidesert
; precipitation
; Rosaceae
; soil
; stable isotopes
; temperature
; willow
; carbon
; climate change
; global warming
; mineralization
; nitrification
; nitrogen
; polar semidesert
; precipitation
; stable isotopes
; Arctic Regions
; Carbon
; Fluorides, Topical
; Greenland
; Nitrogen
; Plant Leaves
; Rain
; Rosaceae
; Salix
; Soil
; Soil Microbiology
; Temperature
; Water
英文摘要: Rapid temperature and precipitation changes in High Arctic tundra ecosystems are altering the biogeochemical cycles of carbon (C) and nitrogen (N), but in ways that are difficult to predict. The challenge grows from the uncertainty of N cycle responses and the extent to which shifts in soil N are coupled with the C cycle and productivity of tundra systems. We used a long-term (since 2003) experiment of summer warming and supplemental summer water additions to a High Arctic ecosystem in NW Greenland, and applied a combination of discrete sampling and in situ soil core incubations to measure C and N pools and seasonal microbial processes that might control plant-available N. We hypothesized that elevated temperature and increased precipitation would stimulate microbial activity and net inorganic N mineralization, thereby increasing plant N-availability through the growing season. While we did find increased N mineralization rates under both global change scenarios, water addition also significantly increased net nitrification rates, loss of NO3 --N via leaching, and lowered rates of labile organic N production. We also expected the chronic warming and watering would lead to long-term changes in soil N-cycling that would be reflected in soil δ15N values. We found that soil δ15N decreased under the different climate change scenarios. Our results suggest that temperature accelerates biological processes and existing C and N transformations, but moisture increases soil hydraulic connectivity and so alters the pathways, and changes the fate of the products of C and N transformations. In addition, our findings indicate that warmer, wetter High Arctic tundra will be cycling N and C in ways that may transform these landscapes in part leading to greater C sequestration, but simultaneously, N losses from the upper soil profile that may be transported to depth dissolved in water and or transported off site in lateral flow. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62299
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106, United States; Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville TN 37996, United States; Environment and Natural Resources Institute, Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK 99508, United States
Recommended Citation:
Schaeffer S.M.,Sharp E.,Schimel J.P.,et al. Soil-plant N processes in a High Arctic ecosystem, NW Greenland are altered by long-term experimental warming and higher rainfall[J]. Global Change Biology,2013-01-01,19(11)