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Aims
The Overyielding effect The capability for mixtures to increase and stabilize wood production over time compared to their constituent species in monoculture is a much discussed topic of silviculture. In this research project I observed how overyielding is affected by diversity within and between tree species in monoculture and mixture harvests in two independent experiments about biodiversity. The fitness of equations Biomass is a main target of studies about ecosystems, especially in climate change issues. An outstanding number of general and site/ species specific biomass equations exist, the vast majority of them cannot be used predicting biomass for stands where several species in several growth stages coexist. Those general ways of predictions are needed to give foresters, observers and scientists a handy tool for decision making processes. I was able to compare existing equations on the base of the miniMydiv project data and the IDENT data for broadleaves and conifers, for European and North American species in monoculture and divergent mixtures. In a next step I found the best performing equation by fitting them to the database. |