ANTHROPOGENIC TRANSFORMATION OF RANGELAND VEGETATION OF KOCHUBEY BIOSPHERE STATION OF NORTH-WESTERN PRE-CASPIAN
The influence of environmental and anthropogenic factors on the change in species diversity and transformation in plant communities has been studied. Studies have shown negative effect of external factors to preserve valuable fodder grass depends on different pasture use patterns on the territory of the Kochubey Biosphere Station. A marked decline in the phytocenosis productivity dynamics with an increased load of 9.53-10.95c / ha under insufficient humidification conditions was shown. The results of the studies are shown that the vegetation change features are primarily caused the occurrence of anthropogenic landscape with dominance of the most persistent xerophytes shrubs and change of native species of communities of unsuitable plant species for feed that form in the continental climate. Changes in the vegetation cover composition and the ratio of the forage grasses species are traced. The uneven distribution of fodder mass between plant species in different seasons of the year was revealed. Established significant changes in the vegetation cover in the experimental plots. Stand of grass is thinned, low projective cover – 20-30%. In places of accumulation of growing species, especially in cereals, the loss of unstable species is observed. The productivity of pasture phytocenosis due to ephemera, forbs, especially dominant xerophytic shrubs of the wet period ranges 14.4-14.18 c / ha, which is associated with increased moisture and normalized load compared to dry years (9.53-10.9c / ha).