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Gewählte Master / Diploma Thesis:

Florian Roidmayr (2016): Stickstoffmodellierung in Agrarökobilanzen Auswahl und Vergleich einfacher Modelle für den Ackerbau.
Master / Diploma Thesis - Institut für Landtechnik, BOKU-Universität für Bodenkultur, pp 171. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
Nitrogen is one of the three main nutrients of agricultural crops and therefore economically and ecologically very important for a farm. N-compounds contribute to aquatic as well as terrestrial eutrophication, they enhance the acidification of the soil and they are significantly involved in climatic changes. One method to assess these negative effects on the environment is Life Cycle Assessment (LCA). In current agricultural LCA-studies mostly rough estimations are being made in order to measure N-emissions. There is a large variety of nitrogen models which can be used to consider regional influences more precisely than the estimations do. The aim of this master thesis is to survey possible nitrogen models for an application on arable land and evaluate if these N-models are useful for the application in the LCA. In a literature research 29 models were taken into account and those models were assessed in two stages: minimum criteria and quality criteria. The most appropriate model has been validated with field experimental data. The results of the testing showed, that three out of the 29 models, reached the second stage of the assessment, namely an assessment following quality criteria. Nevertheless, none of the three models meets all of these criteria completely. Moreover, the practical application of the models turned out to be a challenge because software errors prevented further simulations. The only model of the three which could be successfully implemented was STICS, although it too did not meet all the quality criteria completely and it could undergo a validation of the N2O-emissions in the field test. Its estimates were significantly lower than the measured values. The selected methodology turned out to be effective for achieving the study goals, despite a need to improve some individual steps. Especially the definitions of the criteria have to be formulated in greater detail.

Beurteilende(r): Gronauer Andreas
1.Mitwirkender: Piringer Gerhard

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