tailieunhanh - Báo cáo lâm nghiệp: "Assessing the short rotation woody biomass production on marginal post-mining areas"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Assessing the short rotation woody biomass production on marginal post-mining areas. | JOURNAL OF FOREST SCIENCE 57 2011 7 303-311 Assessing the short rotation woody biomass production on marginal post-mining areas C. Bohm a. Quinkenstein D. Freese R. F. Huttl Chair of Soil Protection and Recultivation Brandenburg University of Technology Cottbus Germany ABSTRACT The Lusatian lignite-mining district Eastern Germany is characterized by a high share of marginal post-mining areas. At these sites crop yield is generally low and hence conventional land use systems often fail in terms of reliable and efficient crop production. In this paper the attempt is made to evaluate the production of woody biomass for bioenergy in short rotation coppices SRC and alley cropping systems ACS with black locust Robinia pseudoacacia L. and lucerne Medicago sativa L. from the aspect of possible ecological and economic benefits compared to the conventional agricultural recultivation practice. The results show that due to both high establishment and harvesting costs and comparatively low prices of energy wood land use systems such as SRC or ACS are currently hardly profitable compared to conventional agriculture. However the cultivation of black locust resulted in a higher humus accumulation and in a lower harvest-related nutrient export than the cultivation of lucerne as a typical recultivation crop in this region. Therefore it can be concluded that for an improvement of soil fertility woody biomass production is more beneficial than the conventional agricultural recultivation practice. Keywords agroforestry black locust carbon accumulation short rotation coppice woody biomass Lignite mining and the reclamation of post-mining areas have a long tradition in the Lusatian region in Eastern Germany. Nowadays the active opencast mines extend over a total area of more than 34 000 ha Statistik der Kohlenwirtschaft 2007 . The opencast mines move continually through the landscape leaving exploited dump areas behind. Therefore in this low-precipitation region there is a high share of