The actual obtainable biomass yields from meadow habitats
are problematic to assess, as the natural conditions of majority
of the areas have not been investigated extensively. Furthermore
the productivity is expected to change over time if nature conservation
is applied on the habitats. On short time perspectives it is
expected that higher biomass yields can be achieved on areas with
low nature quality and high concentrations of soil nutrients. This
could increase the NEG and EROEI significantly compared to the
values found in this study. Long term successful nature conservation
is expected to decrease productivity of the habitats, which will
impact the energy balances. The concept of combining nature conservation
grasses and biogas production thus holds a significant
potential of improving the biodiversity of the meadow habitats
in Denmark, while producing renewable energy and redistributing
nutrients from nature habitats to agricultural land.