Abstract There is limited information regarding bio-geochemical pools and fluxes in maritime tundra eco-systems along the Antarctic Peninsula. To collect baseline information on biogeochemical processes in a tundra ecosystem dominated by two vascular plant species (Colobanthus quitensis and Deschamp...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.459.3690 2023-05-15T13:36:25+02:00 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3690 http://knuforest.net/data/pdf/Paper9.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3690 http://knuforest.net/data/pdf/Paper9.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://knuforest.net/data/pdf/Paper9.pdf text ftciteseerx 2016-01-08T06:24:50Z Abstract There is limited information regarding bio-geochemical pools and fluxes in maritime tundra eco-systems along the Antarctic Peninsula. To collect baseline information on biogeochemical processes in a tundra ecosystem dominated by two vascular plant species (Colobanthus quitensis and Deschampsia ant-arctica) at Biscoe Point off the coast of Anvers Island, we measured pools and fluxes of C and N in trans-planted tundra microcosm cores, complemented with sampling of precipitation and surface runoff. Snow and snowmelt from the tundra collection site and soil leachates from the cores were enriched with N and dissolved organic carbon compared to precipitation and snowmelt samples collected at Palmer Station, indicating high loading of N and organic matter from the penguin colonies adjacent to the tundra site. Rel-atively high values of d15N in the live and dead biomass of D. antarctica and C. quitensis (5.6–25.1&) indicated an enrichment of N in this tundra ecosystem, possibly through N inputs from adjacent penguin colonies. Stepwise multiple linear regressions found that eco-system respiration and gross primary production were best predicted by live biomass of D. antarctica, sug-gesting a disproportionately high contribution of D. antarctica to CO2 fluxes. The cores with higher d 15N and lower d13C in the soil organic horizon exhibited higher CO2 fluxes. The results suggest that abundant N inputs from penguin colonies and the competitive balance between plant species might play a critical role in the response of tundra ecosystems along the Ant-arctic Peninsula to projected climate change. Text Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Arctic Climate change Tundra Unknown Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Arctic Biscoe ENVELOPE(51.367,51.367,-66.217,-66.217) Biscoe Point ENVELOPE(-63.817,-63.817,-64.817,-64.817) Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) The Antarctic |
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Open Polar |
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Unknown |
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ftciteseerx |
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English |
description |
Abstract There is limited information regarding bio-geochemical pools and fluxes in maritime tundra eco-systems along the Antarctic Peninsula. To collect baseline information on biogeochemical processes in a tundra ecosystem dominated by two vascular plant species (Colobanthus quitensis and Deschampsia ant-arctica) at Biscoe Point off the coast of Anvers Island, we measured pools and fluxes of C and N in trans-planted tundra microcosm cores, complemented with sampling of precipitation and surface runoff. Snow and snowmelt from the tundra collection site and soil leachates from the cores were enriched with N and dissolved organic carbon compared to precipitation and snowmelt samples collected at Palmer Station, indicating high loading of N and organic matter from the penguin colonies adjacent to the tundra site. Rel-atively high values of d15N in the live and dead biomass of D. antarctica and C. quitensis (5.6–25.1&) indicated an enrichment of N in this tundra ecosystem, possibly through N inputs from adjacent penguin colonies. Stepwise multiple linear regressions found that eco-system respiration and gross primary production were best predicted by live biomass of D. antarctica, sug-gesting a disproportionately high contribution of D. antarctica to CO2 fluxes. The cores with higher d 15N and lower d13C in the soil organic horizon exhibited higher CO2 fluxes. The results suggest that abundant N inputs from penguin colonies and the competitive balance between plant species might play a critical role in the response of tundra ecosystems along the Ant-arctic Peninsula to projected climate change. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3690 http://knuforest.net/data/pdf/Paper9.pdf |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(51.367,51.367,-66.217,-66.217) ENVELOPE(-63.817,-63.817,-64.817,-64.817) ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) |
geographic |
Antarctic Antarctic Peninsula Anvers Anvers Island Arctic Biscoe Biscoe Point Palmer Station Palmer-Station The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Anvers Island Arctic Biscoe Biscoe Point Palmer Station Palmer-Station The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Arctic Climate change Tundra |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Arctic Climate change Tundra |
op_source |
http://knuforest.net/data/pdf/Paper9.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.459.3690 http://knuforest.net/data/pdf/Paper9.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766078279694942208 |