Impact of deforestation and different agronomical management regimes on biodiversity of mountain ecosystem
2011
Novák, J., Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Opitz von Boberfeld, W. | Javoreková, S.
The experiment was carried out on a mountain grassland established at an altitude of 845 m in 2006-2008, after deforestation of naturally reforested pasture. The aim of research was to examine the changes in plant diversity and concentration of ergosterol in above-ground phytomass of grassland with different regimes of management. The increasing of phytodiversity on variants P (grazing), KP (grazing followed by mowing) and BM (control) during 3 years after deforestation is connected with a relatively low proportion of grasses dominated by Agrostis capillaris. A high percentage of legumes, particularly Trifolium repens, was the only presented on variant VP (grazing on burn plots). Higher number of species on variants KP and PP (grazing after reseeding with clover-grass mixture) resulted in a higher index of diversity. The values of Shannons index of diversity (H) increased the most on variant PP over the years, where high-value species of grasses sown also influenced the grassland quality (EGQ). The lowest values of H were achieved on variant VP, where the grassland quality value (EGQ) was surprisedly the highest due to the dominance of Trifolium repens monoceonosis. On variant BM (without management) the diversity index has decreased due to reforestation (7 kinds of plants). The concentration of ergosterol in the above-ground phytomass of grassland depended on quantity of pathogenic fungi in the soil, and moisture conditions in the autumn of 2006-2008.
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