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Human land use is one of the main causes of world-wide ecological change. Heavy grazing is in man... more Human land use is one of the main causes of world-wide ecological change. Heavy grazing
is in many places, particularly in forest-steppe regions in Mongolia, and it leads to changes in
soil and vegetation. Degradation and recovery may be preceived as changes in species or
ecological groups composition, in total above-ground biomass or in quantity and quality of
forage produced.
The present work was done on the territory of Mungunmorit sum in Central aimag,
Mongolia in 1986-1991 and a comparison was made of the phytocenological characteristics
(productivity, species composition and cover) and relative value of plant ecological group in
vegetation with different levels of grazing pressure: light, moderate, and heavy. Introduction of
heavy grazing often initiates a regressive succession, including a decrease in biomass and
structural complexity.
We began the monitoring study on grass-forb meadow community under influence of overgrazing. On h... more We began the monitoring study on grass-forb meadow community under influence of overgrazing. On hectare plot was fences from grazing making it possible to study degredation process outside and natural restoration process inside. As a result, we determined that projective cover and biomassa of the meadow community directly depend on changing climate and overgrazing. On the fenced plot projective cover has increased by 1.5 times; biomass and average plant height by 3 times. The coenopopulation study as a quality indicator of the community was done. The study followed A.A.Uranov (1975); individuals of species were estimated on 50 x 50 cm plots at the same time inside and outside. The results show that in the fenced community 4196 individuals were countered that by 2.8 times more than outside (1483). From all countered in enclosed community individuals on 45% (1893) occurs the young (p-j-im) then in none enclosed where has over grazing on 40% (594) occurring mature vegetative individuals (V). This fact indicators that fencing not only improves quantitative indicators of community, but also assists its natural recovery.
Human land use is one of the main causes of world-wide ecological change. Heavy grazing is in man... more Human land use is one of the main causes of world-wide ecological change. Heavy grazing
is in many places, particularly in forest-steppe regions in Mongolia, and it leads to changes in
soil and vegetation. Degradation and recovery may be preceived as changes in species or
ecological groups composition, in total above-ground biomass or in quantity and quality of
forage produced.
The present work was done on the territory of Mungunmorit sum in Central aimag,
Mongolia in 1986-1991 and a comparison was made of the phytocenological characteristics
(productivity, species composition and cover) and relative value of plant ecological group in
vegetation with different levels of grazing pressure: light, moderate, and heavy. Introduction of
heavy grazing often initiates a regressive succession, including a decrease in biomass and
structural complexity.
We began the monitoring study on grass-forb meadow community under influence of overgrazing. On h... more We began the monitoring study on grass-forb meadow community under influence of overgrazing. On hectare plot was fences from grazing making it possible to study degredation process outside and natural restoration process inside. As a result, we determined that projective cover and biomassa of the meadow community directly depend on changing climate and overgrazing. On the fenced plot projective cover has increased by 1.5 times; biomass and average plant height by 3 times. The coenopopulation study as a quality indicator of the community was done. The study followed A.A.Uranov (1975); individuals of species were estimated on 50 x 50 cm plots at the same time inside and outside. The results show that in the fenced community 4196 individuals were countered that by 2.8 times more than outside (1483). From all countered in enclosed community individuals on 45% (1893) occurs the young (p-j-im) then in none enclosed where has over grazing on 40% (594) occurring mature vegetative individuals (V). This fact indicators that fencing not only improves quantitative indicators of community, but also assists its natural recovery.