Christian Ahl
University of Göttingen
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Ecological Engineering | 2000
Christian Ahl
Abstract Biomass from forestry, agriculture, and the countryside as an energy source was calculated in terms of Joules for the district of Gottingen in the state of Lower-Saxony, Germany. The land-use structure of the district is comparable to the structure of whole Germany: 50% is devoted to agricultural use and 33% is forestry land. The use of the total biomass source could result in 4197 Terajoules or 100 000 tonnes of oil equivalent. For each inhabitant of the district of Gottingen this could mean a reduction of individual carbon-dioxide emission of 1.26 tonnes or of 11%, annually.
Archive | 1997
Christian Ahl
Kohle, Ol, Torf, Holz und Stroh werden in den unterschiedlichsten geographischen Raumen z.T. seit Urzeiten als Brennstoff zum Heizen oder Kochen genutzt. Alle genannten Kohlenstofftrager besitzen eine gewisse Entstehungszeit: Kohle und Ol bilden sich in Jahrmillionen, Torf kann sich unter Hochmoorbedingungen in wenigen Jahrhunderten aus der Pflanzensubstanz regenerieren, Fichtensetzlinge wachsen unter mitteleuropaischen Klimabedingungen in 100 Jahren zu einem stattlichen Forst heran, und die jahrlichen Graser stellen im Herbst nach ihrer Reifung und Abtrocknung einen Kohlenstofftrager dar, der zwar in seiner Energiedichte den vorhergenannten unterlegen ist, dafur aber einen kurzen Zyklus besitzt.
Archive | 1993
Christian Ahl; G. Breitschuh
Current agricultural systems both in the former GDR and in the EC Member States have caused, in highly intensified areas, damage to soils (erosion, bound residues), to the groundwater (NO3- and chemical-input), to the air (ammonia, aerosols) and at least a diminishing of flora and fauna. The new Bundeslander seem to offer a useful testbed for the improvement of a sustainable agriculture in order to research future possibilities for an environmentally-friendly agro-ecosystem. A scheme of proposed agricultural systems which have to be justified by a long-term run with a wide range of intensification/extensification and a possible environmental payment strategy is outlined for future reforms of the common agricultural policy in the EC.
Journal of Plant Nutrition and Soil Science | 1989
Christian Ahl; Jürgen Niemeyer
Journal of Plant Nutrition and Soil Science | 2010
Eike Stefan Dobers; Christian Ahl; Tomasz Stuczyński
Archive | 2009
Mariana-Christin Albers; Sibylle Pagel-Wieder; Christian Ahl; Heinz Hunfeld; Jürgen Niemeyer
Archive | 2009
Heinz Hunfeld; Christian Ahl; Frank Gessler; Jürgen Niemeyer; Sibylle Pagel-Wieder
Farm Land Erosion#R##N#in Temperate Plains Environments and Hills | 1993
Christian Ahl
Archive | 1985
Christian Ahl; Hans-Jürgen Altemüller; Horst Söchtig