Akbar Akbarzadeh Kahrizi; Ardavan Ghorbani; Bahram Afshar Hamidi; Saeed Amini; Shahriar Yeylagi
Volume 27, Issue 4 , December 2020, , Pages 692-701
Abstract
This study aimed to investigate the effects of livestock grazing in the way, changing the qualitative and quantitative composition of the plant As well as the different groups of plant species density in the enclosure in Boralan area. The vegetation and soil samples and 360 plots at 18 transect method ...
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This study aimed to investigate the effects of livestock grazing in the way, changing the qualitative and quantitative composition of the plant As well as the different groups of plant species density in the enclosure in Boralan area. The vegetation and soil samples and 360 plots at 18 transect method - systematic random out of the enclosure and enclosure in three annual enclosures took place. The position of each plot were recorded using a Global Positioning System. Tilt maps and directions enclosure was prepared. Using the parameters plots a square meter of canopy cover, density, percentage of dead leaves, rocks and pebbles and bare soil were measured. During the growing season and plant species samples were identified using available resources. Shanon Vynz, Brillouin and uniformity Simpson and Simpson, Camargo, Smith and Wilson nor at the species level using Ecological Methodology software version 6.2, respectively. Compare enclosure vegetation parameters using SPSS software (version 16) and The enclosure and the enclosures were analyzed using multivariate methods. The results showed that the obtained in the studied sites (enclosure) 11 dark, 24 genera and 24 species, is widespread. Inside the enclosure with 24 species, with 17 species richness is more than grazed out. Values of richness, diversity and uniformity within the enclosure is greater than the outside enclosure.
massoud Borhani; Zahra Jaberolansar
Volume 25, Issue 1 , April 2018, , Pages 191-200
Abstract
Plant species diversity always implies ecosystem stability against environmental and biological disturbances. This study was conducted to investigate the effects of grazing management on diversity indices of plant species in grazed and exclosed rangeland sites of Hanna station- Semirom. ...
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Plant species diversity always implies ecosystem stability against environmental and biological disturbances. This study was conducted to investigate the effects of grazing management on diversity indices of plant species in grazed and exclosed rangeland sites of Hanna station- Semirom. Sampling was performed using 30 plots (1 m2) along four transects. Canopy area and density of species were recorded in sampling units, and the floristic list was provided in the whole area. Species richness, heterogeneity and evenness indices were calculated from density data and parametric diversity indices including log normal, geometric, and broken stick were fited in both exclosed and grazed areas. The Chi-Square test was used to examine the significance of measured traits. The results of numerical indices showed a higher species richness, evenness and species diversity indices in grazed than in the ungrazed site. The logarithmic diagram in the exclosed and grazed areas followed the broken stick model, indicating the presence of dominant species. The floristic lists of the study sites showed that the number of specific plant species in the grazed site was higher than that of exclosed site. Overall, the results showed that moderate grazing conditions in Hanna station improved plant species diversity indices and increased climax plant species.
Mohamad Hasan Bahmadi; Alireza Shahryari
Volume 23, Issue 1 , June 2016, , Pages 51-57
Abstract
The beneficial use of water resources is one of the important ways of compatibility with drought and preventing desertification process. It should also be tried to use rainfall and surface currents as effectively as possible. The study area including three sites (crescent pond, contour furrow, and control) ...
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The beneficial use of water resources is one of the important ways of compatibility with drought and preventing desertification process. It should also be tried to use rainfall and surface currents as effectively as possible. The study area including three sites (crescent pond, contour furrow, and control) had the same conditions in terms of topography, general slope, aspect, hydrographic network density, soil texture, and soil structure. Then, 15 transects of 100 meters were laid in each site in a random-systematic way on which 30 plots were established. The plot size was calculated to be 16 square meters using the minimal area method. In each plot, vegetation parameters such as canopy cover percentage, density, and production were measured. The collected data were examined in terms of the homogeneity of variances with Leven test, and the normality of the data was tested using the Kolmogorov-Smirnov test. The differences among the study sites were analyzed with one-way ANOVA using SPSS software. The results showed significant differences among the three study sites (p < 0.05). Our results clearly showed that crescent pond and contour furrow were more effective in restoration and increasing of vegetation cover as compared with control. Moreover, crescent pond was more effective in increasing of vegetation cover.
Reza Yari; Ali Tavili; Salman Zare
Volume 18, Issue 4 , September 2012, , Pages 624-636
Abstract
Management activities like crescent intake and enclosure affect the soil surface indicators and rangeland functional attributes. To have a continuous and sustainable utilization of rangelands these changes must be recognized and managed. Indicators of soil surface characteristics and rangeland functional ...
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Management activities like crescent intake and enclosure affect the soil surface indicators and rangeland functional attributes. To have a continuous and sustainable utilization of rangelands these changes must be recognized and managed. Indicators of soil surface characteristics and rangeland functional attributes assist researchers in judging the effects of their applied management activities. The aim of this study is to investigate the effects of management activities like crescent intake and enclosure on soil surface indicators and rangeland functional attributes. For this purpose, three regions including freed enclosure, enclosure and crescent intake were selected and the effect of any aforementioned activities on soil surface characteristics and rangeland functional attributes were investigated by using Landscape Functional Analysis (LFA) method. In this method, for determination of three functional attributes (stability, infiltration and nutrient cycle) 11 soil surface indicators were applied as follows: ground cover, litter cover, litter (degree of decomposition), cryptogam cover, soil surface resistance to distribution, eroded materials, erosion features, soil microtopograghy, soil surface nature, slake test and soil texture. Data analysis was performed with SPSS software, Kruskal-Wallis nonparametric test and a Duncan multiple range test. According to the results, the indicators and functional characteristics of the rangeland have been changed due to the management activities. As significant differences were found among all 11 soil surface indicators except erosion feature and cryptogam cover in three studied regions (P<0.05). Also significant differences were found among three rangeland functional attributes in three study areas. Our results indicate that crescent intake and enclosure could improve rangeland functional attributes.
Esfandiar Jahantab; Adel Sepehri; Bahareh Hanafi; Zohreh Mirdeilamy
Volume 17, Issue 2 , September 2010, , Pages 292-300
Abstract
The study of plant diversity dynamic on grazed and enclosed rangelands is important in range management. The effect of enclosure was studied on plants diversity dynamics on two range condition sites of Dishmook area in Kohgiluyeh & Buyer Ahmad province. Random-systematic sampling was done in two ...
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The study of plant diversity dynamic on grazed and enclosed rangelands is important in range management. The effect of enclosure was studied on plants diversity dynamics on two range condition sites of Dishmook area in Kohgiluyeh & Buyer Ahmad province. Random-systematic sampling was done in two range sites using 220 (2×2 m2) quadrates along 6 transects with the length of 100 m. Vegetation canopy cover percentage was recorded simultaneously in both range sites. Diversity, richness and evenness were determined by using plant diversity indices (Shannon, Simpson, Berger parker & Mc intash). Results show a higher species richness, evenness and species diversity indices in enclosed rangeland. Statistical T-Student Test showed significant differences between two sites in 5 percent level of probability.