In recent years the interest on fast-growing species of tree for energy production has continuously increased. The following study is intended to present the effects - on selected physical (bulk density, field air capacity, field capacity, available water content, permanent wilting point, saturated hydraulic conductivity), chemical (pH-value, soil organic carbon) and biological (respiration, microbial biomass, enzyme activity) soil parameters and earthworm fauna of a chernozem in the Mitteldeutsches Trockengebiet (area Bad Lauchstädt) and a luvisol (area Dornburg) - of cultivating a short rotation coppice (SRC) over many years as well as of reconverting the SRC into arable land (area Bad Lauchstädt). Even after a short period spent cultivating willow and poplar, compared to conventional arable farming systems there is a favourable impact on soil quality. Also the reconverting of the SRC into arable land has an impact on soil physical, chemical and biological parameter. However, the investigation period of one year after the return of SRF into arable use is not sufficient to give a final assessment of long term soil ecological effects, so further investigation is needed.