Most of the current survey data show that trees are more resistant
for mixed forest than pure forest. Because of the high biodiversity
in mixed forest, the stability and resistance of the stands are even stronger
than that of the pure forests with low biodiversity. In addition,
the canopy interlacing in the mixed forest can prevent rain and snow
from intercepting within a certain range, reducing the amount of ice
and snow carried by the canopy of the lower layer, thereby reducing the degree
of damage. Natural tree species and their stable structure are the result
of their long-term evolution, so their resistance is higher than that of plantations.
Artificial forests generally use the introduction modes, the unreasonable plantation
will lead to its resistance dropping, so the artificial forest was harder
than the natural forest. The situation of different types of forests is quite different.
It is generally accepted that conifers are more affected than broad-leaved ones
because coniferous forests are mostly pure forests. The broadleaf forest
is mostly mixed forest, so the damage degree of coniferous forest is higher
than that of broadleaf forest.
In addition, the afforestation situation is closely related to the afforestation
measures and management status. The unreasonable management of the stands will
result in the poor growth of trees, the rampancy of pests and diseases
and the decline of the ability of the forest to resist freezing.
The information is provided by Disaster Risk Reduction Knowledge Service.