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Gewählte Master / Diploma Thesis:

Master / Diploma Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 79. UB BOKU obvsg

Data Source: ZID Abstracts
Nitrous oxide (N2O) is one of the most important climate relevant gases. To estimate the release rates from the agricultural soil types of the Pannonian area, default emission factors (EF) according to the IPCC TIER I criteria is used in the amount of 1%. It is still unclear if these EF factors can be used as standards. As they EF-factors have numerous other variables such as the soil type or the precipitation regime which could have an influence. In the frame of the study, EF-indicators with respect to two different precipitation regimes- the long-term 30-year average precipitation (control=C) and a predicted precipitation regime (dry variant=D) were compared with three most important agricultural soil types of the Pannonian area:-the sandy Chernozem (S), the deep Chernozem (T) and the gleyic Chernozem (F). In addition, the fluxes of soil related greenhouse gases such as methane (CH4) and carbon dioxide (CO2) were also investigated as well as, the flux measurements of ammonium (NH4-N) and nitrate (NO3-N). The experiment was further divided into a fertilized variant (D/Cfert) and an unfertilized variant (D/Cunfert). Results showed that the soil type (F) had an EF-factor of -0.17% and 1.13%; soil type (S) had 0.15% and 0.33% , and soil type (T) had 0.19% and 0.71% in variant (C) and in variant (D), respectively. For none of the soil types significant differences between the N2O emissions rates of Var. C and Var. D were detected. However, the parameter fertilization had a positive effect with a significant influence (P < 0.05) on the fluxes of N2O. The results show that under the current precipitation conditions the EF- default values are not reached according to the current IPCC TIER 1 criteria for the most frequent soil types of the „Marchfeld“. Under predicted precipitation conditions, however, it is possible to approach or exceed the 1% guideline value.

Beurteilende(r): Zechmeister-Boltenstern Sophie

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