Site-growth relationship of different short-rotation coppice tree species in southwestern Germany four years after establishment

Abstract

Due to lack of detailed information on the suitability of short rotation coppice (SRC) species for different climatic regions, over four years this study investigated tree growth and susceptibility to pests and diseases of willow (Salix spp.) and poplar (Populus spp.) clones and other tree species like Alnus spp. and Robinia pseudoacacia at four sites located in southwestern Germany. The study was undertaken in order to deduce the kind of tree species recommended for the various site conditions. In 2009, field trials were established at four sites which differ in climate and soil characteristics (Forchheim, Kupferzell, Marbach and Aulendorf). At all tested locations, a high survival rate (>90 %) was observed for almost all willow and poplar clones and little infestations with leaf rust (Melampsora) and minor leaf damages caused by the poplar leaf beetle (Chrysomela populi) had occurred. The survival of the other tree species varied from 22 to 97 % depending on the site and species. Across all tree species and locations, results indicated that willow clones can be recommended for cold sites and poplars generally seem to require higher temperatures. The Alnus spp. seems to be favorable for both cold and warm conditions while Robinia pseudoacacia can be recommended for warm sites. Due to its chilling sensitivity, Paulownia tomentosa seems to be rather unsuitable for cultivation in southwestern Germany. For all tested sites, it appears that those with heavy soils and dry conditions are inappropriate for establishing SRC species.

Keywords

• short rotation coppice
• <i>Salix</i> spp.
• <i>Populus</i> spp.
• <i>Alnus</i> spp.
• <i>Robinia pseudoacacia</i>
• bioenergy