Silviculture and Cinegetics Review - Societatea Progresul Silvic

CONSERVATION OF FOREST
BIODIVERSITY
SILVICULTURE AND CINEGETICS REVIEW
XVII/30/2012
The study of abundance, as an indicator of species diversity
Abstract
Aliona Sava
There were studied two types of trees: pure beech,
respectively mixed beech and coniferous (fir, spruce,
pine, larch) that were considered middle-aged stands
(40-70 years) and old (95 - 150 years ). There were
analyzed 24 experimental couples, each comprising two
variants: one blank and one covered with works such as
thinning or progressive cutting.
When analyzing pairs of variables covered by the two
types of works, thinning and progressive cutting can be
observed an increasing trend of the variation coefficient
with increasing number of species, especially for
variants covered with progressive cuts, where the
number of identified species is higher.
Both abundance coefficient values and the degree of
correlation, within the thinning is less than the stands
covered by progressive cutting, thanks to the fact that
trees removed in smaller numbers, do not allow the
development of a large number of herbaceous or shrub
species, whereas the light that penetrates to the soil is
limited by the openness of the canopy, the seedlings
playing an important role.
Both the for mesh opening cuttings as well as the ones
of their widening, the soil, herbaceous stratum, seedling
and shrub layer are affected, so that the number of
species that are installed varies.
Keywords: relative abundance, abundance ratio, species
diversity, stands.
Fig. 1 The relationship between the variation coefficient
abundance s%a and the number of species, for the control
pure, young beech stands
Fig. 2. The relationship between the variation coefficient
abundance s%a and the number of species, for the covered
pure, young beech stands
Fig. 3. The relationship between the variation coefficient of
abundance s%a and the number of species, for the control
pure, old beech stands
Fig. 4. The relationship between the variation coefficient of
abundance s%a and the number of species, for the covered
pure, old beech stands
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