期刊
BIOGEOSCIENCES
卷 10, 期 1, 页码 39-52出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-10-39-2013
关键词
-
资金
- Villum Foundation
- Danish Council for Strategic Research through the EcoClim project
- Villum Fonden [00007163] Funding Source: researchfish
The atmospheric greenhouse gas (GHG) budget of a restored wetland in western Denmark was established for the years 2009-2011 from eddy covariance measurements of carbon dioxide (CO2) and methane (CH4) fluxes. The water table in the wetland, which was restored in 2002, was unregulated, and the vegetation height was limited through occasional grazing by cattle and grass cutting. The annual net CO2 uptake varied between 195 and 983 gm(-2) and the annual net CH4 release varied between 11 and 17 gm(-2). In all three years the wetland was a carbon sink and removed between 42 and 259 gCm(-2) from the atmosphere. However, in terms of the full annual GHG budget (assuming that 1 gCH(4) is equivalent to 25 gCO(2) with respect to the greenhouse effect over a time horizon of 100 years) the wetland was a sink in 2009, a source in 2010 and neutral in 2011. Complementary observations of meteorological factors and management activities were used to explain the large inter-annual variations in the full atmospheric GHG budget of the wetland. The largest impact on the annual GHG fluxes, eventually defining their sign, came from site management through changes in grazing duration and animal stocking density. These changes accounted for half of the observed variability in the CO2 fluxes and about two thirds of the variability in CH4 fluxes. An unusually long period of snow cover in 2010 had the second largest effect on the annual CO2 flux, whose interannual variability was larger than that of the CH4 flux. Since integrated CO2 and CH4 flux data from restored wetlands are still very rare, it is concluded that more long-term flux measurements are needed to quantify the effects of ecosystem disturbance, in terms of management activities and exceptional weather patterns, on the atmospheric GHG budget more accurately.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据