Cold-season soil respiration in response to grazing and warming in High-Arctic Svalbard

Polar research

Bo Elberling¹  Heike E. Knicker²  Elisabeth J. Cooper⁴  Ditte Strebel⁷  Elke Morgner⁷ 

[1] Department of Arctic Biology, University Centre in Svalbard, PO Box 156, NO-9171 Longyearbyen, Norway;Department of Arctic Biology, University Centre in Svalbard, PO Box 156, NO-9171 Longyearbyen, NorwayCorrespondence;Department of Arctic and Marine Biology, University of Tromsø, NO 9037 Tromsø, Norway;Department of Arctic Biology, University Centre in Svalbard, PO Box 156, NO-9171 Longyearbyen, Norway;Department of Arctic and Marine Biology, University of Tromsø, NO 9037 Tromsø, Norway;Department of Geoecology and Biogeochemistry, Institute for Natural Resources and Agrobiology, Avda. Reina Mercedes 10, ES-41012 Sevilla, Spain;Department of Geography and Geology, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K., Denmark

关键词: Goose grazing;    soil respiration;    SOC turnover;    Spitsbergen;    tundra vegetation;    warming;   

DOI  :  10.1111/j.1751-8369.2010.00154.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

The influence of goose grazing intensity and open-topped chambers (OTCs) on near-surface quantities and qualities of soil organic carbon (SOC) was evaluated in wet and mesic ecosystems in Svalbard. This study followed up a field experiment carried out in 2003–05 (part of the project Fragility of Arctic Goose Habitat: Impacts of Land Use, Conservation and Elevated Temperatures). New measurements of soil CO2 effluxes, temperatures and water contents were regularly made from July to November 2007. SOC stocks were quantified, and the reactivity and composition measured by basal soil respiration (BSR) and solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. Results reveal variations in soil carbon cycling, with significant seasonal trends controlled by temperature, water content and snow. Experimental warming (OTCs) increased near-surface temperatures in the growing season, resulting in significantly higher CO2 effluxes. Different grazing intensities had no significant effects on observed soil respir...

【 授权许可】

CC BY-NC