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01.06.2012 | Ausgabe 6/2012

Environmental Management 6/2012

The Impact of Map and Data Resolution on the Determination of the Agricultural Utilisation of Organic Soils in Germany

Zeitschrift:
Environmental Management > Ausgabe 6/2012
Autoren:
Norbert Roeder, Bernhard Osterburg
Wichtige Hinweise

Glossary

Arable forage crops: Summarizes all arable crops grown to feed grazing livestock (e.g., green maize, alfalfa, temporary grassland, clover) normally produced on farm and not sold via a market; concentrates (feed grains) are not part of the arable forage crops.
Arable land: Area cultivated with annual crops and temporary grassland fields in ley farming systems. Temporary grassland in ley farming systems is only included in the arable area if the area is ploughed at least once in a five-year interval.
Cash crop: All crops grown to be sold primarily at commodity markets (crops for human consumption or industrial use).
Grazing Livestock: Cattle, sheep, goats and horses.
Main forage area: Summarizes all crops (including grassland) grown to feed grazing livestock.
Suckler cow: A cow which rears its own calf and is later used for beef production; normally grazing during the vegetation period and supplemented only with low levels of concentrates.

Abstract

Due to its nature, agricultural land use depends on local site characteristics such as production potential, costs and external effects. To assess the relevance of the modifying areal unit problem (MAUP), we investigated as to how a change in the data resolution regarding both soil and land use data influences the results obtained for different land use indicators. For the assessment we use the example of the greenhouse gas (GHG) emissions from agriculturally used organic soils (mainly fens and bogs). Although less than 5 % of the German agricultural area in use is located on organic soils, the drainage of these areas to enable their agricultural utilization causes roughly 37 % of the GHG emissions of the German agricultural sector. The abandonment of the cultivation and rewetting of organic soils would be an effective policy to reduce national GHG emissions. To assess the abatement costs, it is essential to know which commodities, and at what quantities, are actually produced on this land. Furthermore, in order to limit windfall profits, information on the differences of the profitability among farms are needed. However, high-resolution data regarding land use and soil characteristics are often not available, and their generation is costly or the access is strictly limited because of legal constraints. Therefore, in this paper, we analyse how indicators for land use on organic soils respond to changes in the spatial aggregation of the data. In Germany, organic soils are predominantly used for forage cropping. Marked differences between the various regions of Germany are apparent with respect to the dynamics and the intensity of land use. Data resolution mainly impairs the derived extent of agriculturally used peatland and the observed intensity gradient, while its impact on the average value for the investigated set of land-use indicators is generally minor.

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