caa a22 4500 605516499 CHVBK 20210128100714.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10533-015-0082-7 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0082-7 Deeper snow alters soil nutrient availability and leaf nutrient status in high Arctic tundra [Elektronische Daten] [Philipp Semenchuk, Bo Elberling, Cecilie Amtorp, Judith Winkler, Sabine Rumpf, Anders Michelsen, Elisabeth Cooper] 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. Springer International Publishing Switzerland, 2015 Winter processes nationallicence Mineralization nationallicence Arctic nationallicence Svalbard nationallicence Plant growth nationallicence Semenchuk Philipp Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut Elberling Bo Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, 1350, Copenhagen, Denmark aut Amtorp Cecilie University Center in Svalbard (UNIS), 9071, Longyearbyen, Norway aut Winkler Judith University Center in Svalbard (UNIS), 9071, Longyearbyen, Norway aut Rumpf Sabine Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut Michelsen Anders Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, 1350, Copenhagen, Denmark aut Cooper Elisabeth Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 81-94 0168-2563 124:1-3<81 2015 124 10533 https://doi.org/10.1007/s10533-015-0082-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0082-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Semenchuk Philipp Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut NATIONALLICENCE 700 1- Elberling Bo Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Amtorp Cecilie University Center in Svalbard (UNIS), 9071, Longyearbyen, Norway aut NATIONALLICENCE 700 1- Winkler Judith University Center in Svalbard (UNIS), 9071, Longyearbyen, Norway aut NATIONALLICENCE 700 1- Rumpf Sabine Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut NATIONALLICENCE 700 1- Michelsen Anders Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, 1350, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Cooper Elisabeth Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 81-94 0168-2563 124:1-3<81 2015 124 10533