Behnam Bahrami; Reza Erfanzadeh; Javad Moetamedi
Volume 22, Issue 1 , June 2015, , Pages 47-58
Abstract
Study on the effect of different grazing intensities on some soil characteristics could be helpful in management and conservation of soil and vegetation. In this study, six key areas were selected with different in grazing intensities. The grazing intensities level for Makueian sheep race was recognized ...
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Study on the effect of different grazing intensities on some soil characteristics could be helpful in management and conservation of soil and vegetation. In this study, six key areas were selected with different in grazing intensities. The grazing intensities level for Makueian sheep race was recognized based on the distance to the villageand the cover percentage of invasive, increaser and decreaser species. In each area, soil sampling was done along systematically established transects, in which 18 soil samples were collected from two depths (0-15 and 15-30 cm). Soil samples were then transferred to the laboratory for the chemical and physical analysis of 17 soil characteristics.The results of principle component analysis showed that silt percentage, coarse and fine aggregate percentage, saturation percentage, and particulate organic carbon of upper layer (0-15 cm) as well as soil texture, the carbon of coarse and fine aggregates, EC, and the bulk density of lower layer (15-30 cm) were more sensitive to sheep grazing as compared to other soil characteristics.
vahid Izadi Khajeloo; younes asri; jaber sharifi nayaragh
Volume 22, Issue 4 , March 2015, , Pages 721-729
Abstract
Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling ...
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Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling was applied. Within the plots, density, coverage, height, length of longest stem, biomass, leaf length and width, and regeneration were measured. A number of 3-5 plants were randomly selected at each site and the root length was measured. Three soil samples were also taken from the root mass depth and a few soil physico-chemical properties were measured. The data were analyzed by ANOVA in Minitab software ver.14. Results showed significant differences among the study sites for coverage and biomass at p<0.05 and density and regeneration at p<0.01. However, no significant differences were recorded for height, length of longest stem, and leaf length and width. According to the results of PCA, soil texture, rainfall, and altitude were the most important factors affecting the density, distribution, and abundance of the species studied. Capparis spinosa L. prefers deep to semi-deep soils with an EC of 2.3 ds/m and a pH of 7.9 for growth and establishment.