Abstract
According to the GCMs air temperature will in- crease 3-5?C above ambient in Central Europe. As one consequence the element turnover in terrestrial ecosystems should change; in particular, the large soil carbon and nitrogen pools are crucial because of their potential to further 'pollute' the globe with liquid and gaseous compounds. According to the goals of the International Geosphere-Biosphere Pro- gramme (IGBP) an ecosystem manipulation was carried out to increase the temperature of the top soil in an agroecosystem No changes in the soluble nitrogen pools could be measured at the end of the investigation, probably because of the short heating period and the high spatial variability. However, N20-N emissions were much higher in the unheated plot (0.233 kg ha-1) compared with the heated one (0.058 kg ha - 1). This effect could be caused by more frequent freezing- thawing cycles in the unheated plots, which showed the highest emission rates. The importance of the reduced water content in the heated plot could not be evaluated in this investigation. Based on the experiences of this study a sched- ule for intensified field experiments was developed.
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