Afforestation of slopes damaged by mass movements is an essential part of technical stabilisation and drainage measures. The thesis was carried out to quantify the soil bioengineering performance of a 20 years old alder stand, which was established after a large-scale slide in 1982. To demonstrate the interactions between soil status, stand and biomass structures and the hydrological functions on difficult sites, soil physical and mineralogical analyses and stand analyses based on sample plot surveys were carried out. Stem reduction served to validate the regeneration capacity after coppicing. During 2001 and 2002 soil water content and interception were measured continuously. Soil specific linear and multiple regression models were developed to calibrate the soil moisture sensors (CS 615 WCR) using field data. Using the water balance equation, evapotranspiration rates of selected periods were generated. A series of biometric parameters including the leaf area index (LAI), were evaluated. Allometric functions between ln-transformed tree parameters and biomass fractions were computed using the regression analytical method. The soil texture of the former landslide is clay, its mineralogical components are dominated by swelling clay minerals leading saturated conditions throughout the year (water content up to 0.79 m3 m-3). At 7,023 stems per hectare, the total stand biomass equated to 18 t/ha having an LAI of 1.5. Full pole wood removal proved to be more advantageous for coppice sprouting. Despite unfavourable site conditions the alder stand produced considerable above ground biomass. Interception up to 258.3 mm and evapotranspiration up to 731.8 mm show that the water regime of former land slides can be efficiently influenced by artificial establishment of alder forests.