Standorts- und ernaehrungskundliche Untersuchungen zur Nutzung landwirtschaftlicher Flaechen fuer die Erzeugung von Biomasse mit schnellwachsenden Baumarten Zusammenfassung der Ergebnisse fuer die Jahre 1988 bis 1993. Abschlussbericht

Abstract

An interdisciplinary field experiment with 4 fast growing poplar and willow clones was established in 1983 on land previously used agriculturally in order to investigate the influence of site, as well as the nutritional and growth aspects and the ecological consequences of this type of land use. At the end of the second rotation period (winter 1992) the height of the poplar clone Muhle Larsen amounted to 7 m, of the aspen Astria and the willow to about 5 m. Dry matter shoot biomass was 20 t/ha for Astria, 30 t/ha for the willow and 32 t/ha for Muhle Larsen. Production on soils subjected to high groundwater was lower than on moderately moist soils. Unfertilized poplars showed optimum nutrition even 10 years after planting. Nitrogen fertilization significantly enhanced shoot biomass only for Salix viminalis. Results of soil inventories in 1983, 1986 and 1992 showed a slight decrease of soil reaction by time. The organic matter and the total nitrogen concentration and the microbial biomass of the soils increased in layers near the soil surface and decreased in deeper layers of the former plough horizon, respectively. Species number of the ground vegetation increased at the afforested sites as compared with a control field. Some groups of the soil macrofauna (woodlice, earthworms, harvestmen) advanced in abundance and activity or showed an increase in biological diversity (carabid beetles). (orig.)SIGLEAvailable from TIB Hannover: F95B93+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman