Nematollah Madadi Zadeh; Hossein Arzani; Ghavaloddin ahedi; Najmeh Faryabi
Volume 21, Issue 1 , June 2014, , Pages 128-138
Abstract
In the current study, the effects of exclosure were examined on rangeland vegetation at two study sites including, reference site (inside the exlosure) and critical site (outside the exclosure). Research was conducted by the systematic-random method and 160 2*1.5 m plots were established. Inside each ...
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In the current study, the effects of exclosure were examined on rangeland vegetation at two study sites including, reference site (inside the exlosure) and critical site (outside the exclosure). Research was conducted by the systematic-random method and 160 2*1.5 m plots were established. Inside each plot, the percentage of canopy cover, litter, gravel and bare soil as well as density of class I, II, and III species were recorded. Dry matter yield was also calculated. Four-factor method and trend balance method were applied to determine the range condition and range trend, respectively. According to the obtained results, due to the exclosure, litter, yield, canopy cover percentage and class I species composition increased up to 24.72%, 37.42%, 23.6%, and 80.6%, respectively. On the other hand, the percentage of bare soil, gravel, and class III species composition decreased to 34.29%, 17.16%, and 26.96%, respectively. Mean differences in all parameters inside and outside the exclosure were significant at both study sites. Our results also indicated that exclosure led to the improvement of range condition and range trend.
Golriz Hossienzadeh; Hamid Jalilvand; Reza Tamartash
Volume 14, Issue 4 , February 2008, , Pages 500-512
Abstract
Regarding to the importance and role of enclosure as an appropriate management in the natural resources, specially protection of vegetation cover and the soil of pastures, the effects of different grazing intensities on the vegetation cover changesand chemicalsoil properties in countryside pastures ...
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Regarding to the importance and role of enclosure as an appropriate management in the natural resources, specially protection of vegetation cover and the soil of pastures, the effects of different grazing intensities on the vegetation cover changesand chemicalsoil properties in countryside pastures of Esklim Rood district (placed in west of Savad kooh township) was studied. These pastures investigated to reveal the effects of prohibition on the vegetation cover changes and some soil chemical properties at three conditions of Reference, Key and Critical areas. The results show that delicious (Class I) in the reference region, average delicious (Class II) in the key region, and low delicious or non delicious plants (Class III) in the critical region, have the most vegetation cover percentage. So that, perennial and delicious grasses such as Festuca ovina L, Ermopoa persica T. Dactylis glomerata L. had the highest vegetation cover percentage in the reference region but by the increase of grazing, delicious species decreased gradually and average or non delicious plants increased. This study revealed that soil of the reference region which had the highest density and vegetation cover had more organic material, total nitrogen, phosphorus, potassium, and less acid in the surface horizon than that of grazing region. Also, results show that short- term enclosure affected on the protection of soil and vegetation cover due to high productivity.