methods for determining emission factors for the use of peat and peatlands — flux measurements and modelling
نویسندگان
چکیده
1) Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland 2) Department of Environmental Sciences, University of Kuopio, P.O. Box 1627, FI-70211 Kuopio, Finland 3) Department of Forest Ecology, P.O. Box 27, FI-00014 University of Helsinki, Finland 4) Finnish Meteorological Institute, P.O. Box 503, FI-00101 Helsinki, Finland 5) Faculty of Biosciences, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland
منابع مشابه
Direct Human Impacts on the Peatland Carbon Sink
Northern peatlands occupy over 3 million km2 globally and contain the largest carbon (C) pool (typically >100 kg C m-2) among terrestrial ecosystems. Agri culture, forestry, and peat harvesting are the principal humaninduced activities that alter the peatland and hence the distribution and flux of carbon. As a prerequisite to those uses, the peatland is usually drained, which has longterm ef...
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Peatlands cover over 400 million hectares of the Earth's surface and store between one-third and one-half of the world's soil carbon pool. The long-term ability of peatlands to absorb carbon dioxide from the atmosphere means that they play a major role in moderating global climate. Peatlands can also either attenuate or accentuate flooding. Changing climate or management can alter peatland hydr...
متن کاملEvidence that piezometers vent gas from peat soils and implications for pore-water pressure and hydraulic conductivity measurements
Entrapped gas bubbles in peat can alter the buoyancy, storativity, void ratio and expansion/contraction properties of the peat. Moreover, when gas bubbles block water-conducting pores they can significantly reduce saturated hydraulic conductivity and create zones of over-pressuring, perhaps leading to an alteration in the magnitude and direction of groundwater flow and solute transport. Some pr...
متن کاملIn the line of fire: the peatlands of Southeast Asia.
Peatlands are a significant component of the global carbon (C) cycle, yet despite their role as a long-term C sink throughout the Holocene, they are increasingly vulnerable to destabilization. Nowhere is this shift from sink to source happening more rapidly than in Southeast Asia, and nowhere else are the combined pressures of land-use change and fire on peatland ecosystem C dynamics more evide...
متن کاملRecent peat accumulation rates in minerotrophic peatlands of the Bay James region, Eastern Canada, inferred by 210Pb and 137Cs radiometric techniques.
(210)Pb and (137)Cs dating techniques are used to characterise recent peat accumulation rates of two minerotrophic peatlands located in the La Grande Rivière hydrological watershed, in the James Bay region (Canada). Several cores were collected during the summer 2005 in different parts of the two selected peatlands. These minerotrophic patterned peatlands are presently affected by erosion proce...
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