Hamidreza Mirdavoudi; Ehsan Zandi Esfahan; Gholamreza Goudarzi; Ali Famaheini
Volume 28, Issue 2 , June 2021, , Pages 328-340
Abstract
In this study, the initial assessment of carbon storage in plant communities of Lycium depressum Stocks and Zygophylum fabago L. was done in the Meyghan playa, Arak. Plant sampling was done by the random-systematic method. To determine the aboveground and underground biomass, ...
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In this study, the initial assessment of carbon storage in plant communities of Lycium depressum Stocks and Zygophylum fabago L. was done in the Meyghan playa, Arak. Plant sampling was done by the random-systematic method. To determine the aboveground and underground biomass, a clipping method was used, and these organs were weighed separately. The organic carbon of plant samples was determined by the ash method. Soil studies were performed in each plant type, in the depth of plant rooting, as well as in areas without plants. The data were analyzed by SPSS24 software. The results showed that the soil and plant average carbon sequestration of Z. fabago habitat was 14.61 and 0.18, and in L. depressum type was 13.8 and 0.425 ton/ha. This difference was not significant at the 5% level. Soil carbon sequestration increased significantly in areas covered with studied species (t = - 6.902, p < /em> = 0.001), compared to the areas without any vegetation cover. The carbon conversion coefficient of above and underground organs of the studied plants was significant at the level of 5% and the carbon sequestration of aboveground parts of the plant to underground carbon sequestrated ratio in Z. fabago and L. depressum was 2.43 and 2.08, respectively. Considering the carbon storage capacity of plants studied (in the soil and plant), it can be concluded that these plants can play an important role in carbon sequestration at the least possible cost, and mitigation of climate change consequences in arid regions.
Mostafa Zare; Mohammad Fayaz; Gholamreza Goudarzi; Ali Farmahini
Volume 21, Issue 2 , August 2014, , Pages 329-335
Abstract
Temporal and spatial factors have different effects on grazing behavior so that different temporal parameters including the speed and distance walked by livestock are among the factors that can serve as an important tool in grazing management. This research was conducted in Anjedan, a semi-steppe ...
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Temporal and spatial factors have different effects on grazing behavior so that different temporal parameters including the speed and distance walked by livestock are among the factors that can serve as an important tool in grazing management. This research was conducted in Anjedan, a semi-steppe region in Arak province, in different months of grazing season (five months) during 2007-2010. To determine the parameters, a GPS, attached to the livestock, was used in a certain day of each month of grazing season. The speed of livestock movement, the length of distance walked by livestock, and the time spent for grazing, rest and movement were recorded. The data were analyzed in a completely randomized design and the means were compared using Duncan’s Multiple Range Test. According to the obtained results, the speed of livestock movement, the length of distance walked by livestock and the time spent for rest and movement showed significant difference during the studied years as well as in the months of grazing season. The time spent for grazing did not show significant difference in different years; however a significant difference at 5% level of probability was recorded in different months. More grazing, movement and rest and less distance walked by livestock were recorded when the environmental and climatic conditions were appropriate for the growth of range species especially annuals.
Gholamreza Goudarzi; Ali Farmahini Farahani; Hamidreza Mirdavoudi
Volume 19, Issue 3 , December 2012, , Pages 395-405
Abstract
Determination of allowable use of the key species of rangelands is necessary to calculate the rangeland capacity. Actual rangeland capacity could be determined through having the exact values of this factor for rangeland species and the destruction of vegetation, soil and water loss on rangelands can ...
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Determination of allowable use of the key species of rangelands is necessary to calculate the rangeland capacity. Actual rangeland capacity could be determined through having the exact values of this factor for rangeland species and the destruction of vegetation, soil and water loss on rangelands can be avoided. In this research, Artemisia aucheri, Bromus tomentellus, Kochia prostrata, Asperula glomerata and Buffonia koelzii were investigated as the key species of Arak Enjedan rangelands. A key area of one hectare was selected in Arak Enjedan rangelands and was fenced in the first year of the study. Then, 40 individuals were selected from each species and harvesting intensities of 25, 50, 75% and control treatment were implemented. Harvesting was done by a clipper monthly during grazing season for 4 years. The influence of harvesting was investigated in the second to fifth years through the study of changes in phenological characteristics, forage and seed production, vitality, and mortality and other characteristics of plant species. Results showed that increasing the harvesting intensity caused problems and decline of vital abilities of all species especially, As. glomerata and Br. tomentellus that are more palatable species. According to the results, an allowable use of 25% is recommended for Br. tomentellus and As. Glomerata while for Ar. aucheri, Ko. prostrata and Bu. Koelzii an allowable use of 50% was obtained with the least negative effects on plant characteristics. Results of the analysis of variance for forage production data were significant for all of the studied species in %1 level of probability.
Mostafah Zare; Mohammad Fayyaz; Gholamreza Goudarzi; Ali Farmahini farahani
Volume 19, Issue 1 , June 2012, , Pages 178-190
Abstract
The preference value is defined as selection of available species by livestock in the free grazing. This study was conducted in semi steppe rangelands of Anjedan located 35 Km far from east Arak. These rangelands are of important centers for keeping livestock which is under heavy grazing with a poor ...
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The preference value is defined as selection of available species by livestock in the free grazing. This study was conducted in semi steppe rangelands of Anjedan located 35 Km far from east Arak. These rangelands are of important centers for keeping livestock which is under heavy grazing with a poor condition. The soil of the study area is loamy with high stone and gravel. This study was performed to determine the preference value of important species for sheep to support palatable species in range management plans. Direct observation (timing) method was used to calculate the time spent on livestock grazing and presence during grazing season for 3 years. Afterward, data were analyzed by SAS software in a complete random block design and Duncan test was used for mean comparisons. The results showed the preference value in different season grazing months significantly differed (p<0.01). Generally, annual grasses and forbsshowed maximum preference value. Plant litters, Bromus tomentelus, Artemisia aucheri, Buffonia koelzii respectively ranked next in terms of preference value.
Akbar Gandomkar Ghalhary; Mohammad Khosroshahi; Gholam reza Godarzi; Hojat ... ZAhedi pur; Esmaeil Azez abadi
Volume 17, Issue 1 , September 2010, , Pages 149-165
Abstract
Desert is a location in which life of plant and animal is hardly possible. In desert formation, different parameters including: climate, geology, vegetation, pedology, hydrology and geomorphology are special and their interaction to each other plays an important role. For desert area vegetation ...
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Desert is a location in which life of plant and animal is hardly possible. In desert formation, different parameters including: climate, geology, vegetation, pedology, hydrology and geomorphology are special and their interaction to each other plays an important role. For desert area vegetation and their boundaries, detailed investigation on such parameters and their interaction to each other is necessary. In this research, desert area of Markazi province was studied from the view point of vegetation. With determination of desert area boundary and gathering detailed data on such an area, the combating desertification and proper use and planning of desert area is possible. For this reason, first of all, the dominant vegetation types were determined and digitized using GIS with Ilwis academic program software. Then the dominant vegetation types were divided to different groups. The map of desert area and their boundaries were determined with taking into consideration the existing data and information and vegetation types characteristics. The result shows that the total desert vegetation types are 276074 ha with 21 special desert vegetation types and their potential capacity were determined. The result also show that the widest desert vegetation types are Hultemia persica – Scariola orientalis with 77833.8 ha which are distributed in Saveh, Arak, Delijan and Khomain townships and smallest desert vegetation type is Nitraria schoberri with 299.5 ha in marginal salty land of Mayghan playa. Finaly, vegetation map with boundaries of 21 desert vegetation types produced for this study area. ation types