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Understory management and microbial functioning in forests

This new study aims to measure the impact of understory management and fertilization on certain forest ecosystem functions (tree productivity, organic matter decomposition, carbon storage).

The researcher carried out her study in two maritime pine stands, one on dry heathland and the other on wet heathland.

The results varied considerably depending on the context:

  • Removal of the undergrowth had a very strong effect on the microclimate in both ecosystems (greater amplitude in the dry heath context).
  • On wet heathland, the limiting factor being nutritive, removing the nutrient constraint either by fertilization or by eliminating the undergrowth increased above-ground biomass production, but had little or no effect on soil processes.
  • On dry heath, removal of the undergrowth led to a significant increase in pine growth, probably due to the alleviation of competition for resources, especially during the first years.
  • Management of the undergrowth had a really negative effect on soil carbon stocks, as the species that make up the undergrowth in dry heathland (Ericaceae) tend to favour the accumulation of organic matter. This negative effect was accompanied by lower microbial community activity in the managed plots.