Effekte unterschiedlicher Langzeitdüngerstrategien auf Humusgehalt und N2O Emissionen landwirtschaftlich genutzter Böden

Abstract

The cumulative dissertation is based on three manuscripts to which the PhD candidate predominantly contributed as the first author and one article to which she contributed as co-author. The studies are or will be published in international refereed journals: Jäger, N., Duffner, A., Ludwig, B., Flessa, H.: Long-term and short-term effects of the application of mineral and organic fertilizer on N 2 O and CO 2 emissions from a sandy soila laboratory incubation Jäger, N., Stange, C.F., Ludwig, B., Flessa, H.: Emission rates of N 2 O and CO 2 from soils with different organic matter content from three long-term fertilization experiments -a laboratory study Jäger, N., Dechow, R., Oltmanns, M., Raupp, J., Flessa, H.: Effects of different long-term fertilization treatments on soil organic matter stocks, N 2 O emissions and CH 4 uptake of a sandy soil Ludwig, B., Jäger, N., Priesack E., Flessa, H.: Application of the DNDC model to predict N 2 O emissions from sandy arable soils with differing fertilization in a long-term experiment, Journal of Plant Nutrition and Soil Science, accepted This thesis starts with a general introduction that imparts knowledge about the climaterelevant trace gases CO 2 and N 2 O. The processes of production and consumption in soils are explained and the reasons, how carbon sequestration influences the climate change and agriculture, are given. Then, the supposed mechanism of carbon sequestration leading to