TY - JOUR
T1 - First estimates of regional (Allgäu, Germany) and global CH 4 fluxes from wet colluvial margins of closed depressions in glacial drift areas
AU - Sommer, Michael
AU - Fiedler, Sabine
AU - Glatzel, Stephan
AU - Kleber, Markus
PY - 2004/6/1
Y1 - 2004/6/1
N2 - Agriculture is one of the major anthropogenic methane source. However, emission inventories of agricultural soils are rather uncertain. One reason for this is the existence of small areas of very high biogeochemical fluxes ('hot spots'), which are not incorporated into soil maps. Here a procedure for an upscaling of one man-made 'hot spot' is presented. In hummocky ground moraines of temperate-humid climate (Allgäu, Germany) erosion and subsequent sedimentation of topsoil material in wet footslope areas has led to very high emissions from depression margins (median annual flux=39 g CH4 m -2). These areas make up 7% of the region studied according to a digital terrain analysis based on a DEM 50. GIS-based modelling showed their regional and global relevance to be a result of the (i) unit area source strength, (ii) relative acreage of depression margins in catchments of hummocky landscapes, and (iii) global dimension of hummocky landscapes with closed depressions. First conservative estimates yielded methane emissions of 1.1 Gg (regional, Allgäu) and 2.5 Tg (global) from colluvial margins in similar landscapes, respectively.
AB - Agriculture is one of the major anthropogenic methane source. However, emission inventories of agricultural soils are rather uncertain. One reason for this is the existence of small areas of very high biogeochemical fluxes ('hot spots'), which are not incorporated into soil maps. Here a procedure for an upscaling of one man-made 'hot spot' is presented. In hummocky ground moraines of temperate-humid climate (Allgäu, Germany) erosion and subsequent sedimentation of topsoil material in wet footslope areas has led to very high emissions from depression margins (median annual flux=39 g CH4 m -2). These areas make up 7% of the region studied according to a digital terrain analysis based on a DEM 50. GIS-based modelling showed their regional and global relevance to be a result of the (i) unit area source strength, (ii) relative acreage of depression margins in catchments of hummocky landscapes, and (iii) global dimension of hummocky landscapes with closed depressions. First conservative estimates yielded methane emissions of 1.1 Gg (regional, Allgäu) and 2.5 Tg (global) from colluvial margins in similar landscapes, respectively.
KW - GIS
KW - Greenhouse gases inventories
KW - Methane sources
KW - Redoximorphic soils
KW - Up-scaling
UR - http://www.scopus.com/inward/record.url?scp=2442625596&partnerID=8YFLogxK
U2 - 10.1016/j.agee.2003.09.019
DO - 10.1016/j.agee.2003.09.019
M3 - Article
AN - SCOPUS:2442625596
SN - 0167-8809
VL - 103
SP - 251
EP - 257
JO - Agriculture, Ecosystems and Environment
JF - Agriculture, Ecosystems and Environment
IS - 1
ER -