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NordGen Forest Conference 2016 - selected topics

Tree species mixing can increase stand productivity

Mixed stands are on the advance as they can provide many ecological and social ecosystem functions and services. In addition they can be even more productive and more economic than mono-specific stands.

- Species mixing can considerably increase the growth rates and the stand carrying capacity of  forests, Hans Pretzsch from the Technical University in Munich stated at the NordGen Forest Conference 2016 in Växjö, Sweden.

Stand density, standing volume and yield level are more affected by mixing than mean stand height or diameter. The considerable increase in structural heterogeneity can mean higher stand stability, resilience and habitat diversity. Tree species mixing can significantly modify individual tree morphology and reduce or improve wood quality, Pretzsch concluded.

Mixtures_European beech_Douglas fir_Pretzsch_small

Mixtures of European beech and Douglas-fir or other complementary tree species can overyield pure monocultures of the same species by 10-30 %. Photo: Leonhard Steinacker

At the NordGen Forest Conference "Growing Mixed Forests - waste or value for the future?", Hans Pretzsch held a presentation with the following topics related to mixed forest stands:

  • Main causes of tree species mixing effects
  • Dependency of mixing effects on site conditions
  • Effects of tree species mixing on stand growth
  • Effects on size distribution and stand structure
  • Effects on tree morphology, allometry and growth allocation

Read the full article from Hans Pretzsch here.