首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Elevated concentrations of CO2 may double methane emissions from mires
Authors:PAUL R HUTCHIN  MALCOLM C PRESS  JOHN A LEE  TREVOR W ASHENDEN†
Institution:Department of Animal and Plant Sciences, PO Box 601, University of Sheffield, Sheffield, UK;Institute of Terrestrial Ecology, Deiniol Road, Banker, Wales, UK
Abstract:The potential impact of an increase in methane emissions from natural wetlands on climate change models could be very large. We report a profound increase in methane emissions from cores of mire peat and vegetation as a direct result of increasing the CO2 concentration from 355 to 550 μol mol?1 (a 60% increase). Increased CH4 fluxes were observed throughout the four month period of study. Seasonal variation in CH4 flux, consistent with that seen in the field, was observed under both ambient and elevated CO2. Under ambient CO2, methane fluxes rose from 0.02 μol m-2 s?1 in May to 0.11 μol m?2 s?3 in July before declining again in August. Under elevated CO2 methane fluxes were at least 100% greater throughout the experiment, rising from 0.05 μol m-2 s?1 in May to a peak of 0.27 μol m?2 s?1 in July. The stimulation of CO4 emissions was accompanied by a 100% increase in rates of photosynthesis from 4.6 (± 0.3) under ambient CO2 to 9.3 (± 0.7) μol m?2 s?1. Root and shoot biomass were unaffected.
Keywords:carbon dioxide  climate change              Eriophorum vaginatum            methane  mires
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号