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Featured researches published by Christian Ahl.


Ecological Engineering | 2000

Biomass energy in a small-scale region of a developed country — the case of the district of Goettingen

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

Das Potential der CO2-Minderung durch zyklierenden Kohlenstoff als Energieträger — Von der Region zu größeren Einheiten

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

Possibilities For an Environmentally-Sound Restructuring of Agriculture in The New BundeslÄnder (2. Communication)

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

The fractal dimension of the pore‐volume inside soils

Christian Ahl; Jürgen Niemeyer


Journal of Plant Nutrition and Soil Science | 2010

Comparison of Polish and German maps of agricultural soil quality using GIS

Eike Stefan Dobers; Christian Ahl; Tomasz Stuczyński


Archive | 2009

Böden und gentechnisch veränderter Mais (Bt-Mais)- Teil II -Effekt der physico-chemischen Parameter der Böden auf die Retardation von Cry3Bb1

Mariana-Christin Albers; Sibylle Pagel-Wieder; Christian Ahl; Heinz Hunfeld; Jürgen Niemeyer


Archive | 2009

Böden und gentechnisch veränderter Mais (Bt-Mais) Teil I - Quantifizierung der Sorption von Cry3Bb1 an Bodenfraktionen einer Freisetzungsfläche

Heinz Hunfeld; Christian Ahl; Frank Gessler; Jürgen Niemeyer; Sibylle Pagel-Wieder


Farm Land Erosion#R##N#in Temperate Plains Environments and Hills | 1993

“Possibilities for an environmentally-sound restructuring of agriculture in the new Bundesländer”

Christian Ahl


Archive | 1985

Die Tonverteilung auf verschiedene Aggregatgrößenfraktionen des Bodens in Abhängigkeit von der organischen Düngung

Christian Ahl; Hans-Jürgen Altemüller; Horst Söchtig

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Heinz Hunfeld

University of Göttingen

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Frank Gessler

University of Göttingen

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