DOI: 10.1007/s10533-015-0082-7
Scopus记录号: 2-s2.0-84930270914
论文题名: Deeper snow alters soil nutrient availability and leaf nutrient status in high Arctic tundra
作者: Semenchuk P.R. ; Elberling B. ; Amtorp C. ; Winkler J. ; Rumpf S. ; Michelsen A. ; Cooper E.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 81
结束页码: 94
语种: 英语
英文关键词: Arctic
; Mineralization
; Plant growth
; Svalbard
; Winter processes
Scopus关键词: ammonium
; chlorophyll
; climate change
; concentration (composition)
; deciduous tree
; dissolved organic matter
; herb
; low temperature
; mineralization
; nitrate
; nutrient availability
; snow
; soil carbon
; soil nitrogen
; soil nutrient
; soil temperature
; tundra
; vegetation type
; winter
; Arctic
; Svalbard
; Svalbard and Jan Mayen
; Bistorta
; Luzula
; Luzula arcuata
; Polygonum viviparum
; Salix
; Salix polaris
英文摘要: Nitrogen (N) mineralization, nutrient availability, and plant growth in the Arctic are often restricted by low temperatures. Predicted increases of cold-season temperatures may be important for plant nutrient availability and growth, given that N mineralization is also taking place during the cold season. Changing nutrient availability may be reflected in plant N and chlorophyll content and lead to increased photosynthetic capacity, plant growth, and ultimately carbon (C) assimilation by plants. In this study, we increased snow depth and thereby cold-season soil temperatures in high Arctic Svalbard in two vegetation types spanning three moisture regimes. We measured growing-season availability of ammonium (NH4 +), nitrate (NO3 −), total dissolved organic carbon (DOC) and nitrogen (TON) in soil; C, N, δ15N and chlorophyll content in Salix polaris leaves; and leaf sizes of Salix, Bistorta vivipara, and Luzula arcuata at peak season. Nutrient availability was significantly higher with increased snow depth in the two mesic meadow vegetation types, but not in the drier heath vegetation. Nitrogen concentrations and δ15N values of Salix leaves were significantly higher in all vegetation types, but the leaf sizes were unchanged. Leaves of Bistorta and Luzula were significantly larger but only significantly so in one moist vegetation type. Increased N and chlorophyll concentrations in leaves indicate a potential for increased growth (C uptake), supported by large leaf sizes for some species. Responses to cold-season soil warming are vegetation type- and species-specific, with potentially stronger responses in moister vegetation types. This study therefore highlights the contrasting effect of snow in a tundra landscape and has important implications for projections of whole tundra responses to climate change. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83509
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: Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway; University Center in Svalbard (UNIS), Longyearbyen, Norway; Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark; Department of Conservation Biology, Vegetation and Landscape Ecology, Faculty Centre for Biodiversity, University of Vienna, Rennweg 14, Vienna, Austria; Department of Biology, University of Copenhagen, Copenhagen Ø, Denmark
Recommended Citation:
Semenchuk P.R.,Elberling B.,Amtorp C.,et al. Deeper snow alters soil nutrient availability and leaf nutrient status in high Arctic tundra[J]. Biogeochemistry,2015-01-01,124(2018-01-03)