Mohammad Ghaitori; Yahya Parvizi; Mosayeb Heshmati; Mohammad Ahmadi
Volume 25, Issue 1 , April 2018, , Pages 44-53
Abstract
Due to the vast area and biodiversity, rangelands contribute to carbon sequestration, depending on grazing management and utilization. This research was conducted on six rangeland sites including Paveh, Ravansar, Javanrood, Einelcosh, Siahkamar, Varmenjeh, and Koohsefid in Kermanshah Province. There ...
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Due to the vast area and biodiversity, rangelands contribute to carbon sequestration, depending on grazing management and utilization. This research was conducted on six rangeland sites including Paveh, Ravansar, Javanrood, Einelcosh, Siahkamar, Varmenjeh, and Koohsefid in Kermanshah Province. There utilization types were included as exclosure, heavy grazing, and land use change from rangeland to rainfed orchard. The objective was to evaluate carbon sequestration capacity through different rangeland utilization. The plant biomass sampling including canopy cover and plant root as well as plant litter were carried out in the field along three transects of 50 m using plots. Soil sampling was also done in 0-20 and 20-40 cm soil depths. Plant organic carbon was determined by flame method and SOC was measured by the Walkley and Black method. The results explored that plant biomass variation through different land-use practices and utilization is significantly attributed to carbon sequestration, so that the highest level of carbon stock for plant biomass (4.7 tha-1) and soil (114.5 tha-1) was obtained in the exclosure site, while heavy grazing caused the lowest value of organic carbon in both plant biomass (1.3 tha-1) and soil (53.4 tha-1). In addition, the land use change from rangeland to rain-fed orchard led to 86.8 tha-1 organic carbon storage in both soil and plant biomass.
Maryam Dadgar; Shahla Mahmoudi; Mohammad Hosein Mahdian; Mohammad Hosein Masih Abadi; Reza Sokooti Oskouie
Volume 21, Issue 3 , December 2014, , Pages 409-415
Abstract
In our country, regardless of a limited area, soil organic carbon is very low in most areas of production such as agriculture and rangeland. This fact suggests that slight change in the amount of organic carbon can have high impact on soil properties and thus its quality in arid and semi-arid conditions. ...
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In our country, regardless of a limited area, soil organic carbon is very low in most areas of production such as agriculture and rangeland. This fact suggests that slight change in the amount of organic carbon can have high impact on soil properties and thus its quality in arid and semi-arid conditions. Determination of soil organic carbon (SOC) is of great importance because of its role in physical, chemical and biological properties. This research was aimed to estimate soil organic carbon using pedotransfer functions and the independent variables of soil physical and chemical properties in Damavand Rangelands. For this purpose, 60 soil samples were taken systematically at a soil depth of 0-30 cm in Damavand rangelands and soil organic carbon, pH, lime, nitrogen, sand, silt and clay were determined. Results showed that the average percentage of organic carbon was 0.49 percent and the minimum and maximum were 0.1% and 0.92%, respectively with a normal distribution. According to the obtained results, soil organic carbon was significantly positively correlated with clay and then with the nitrogen. One of the methods used to estimate soil organic carbon is a multivariate linear regression model where the dependent variables (clay, nitrogen, sand, silt, soil pH, bulk density and the percentage of gravel) are used, having a high correlation coefficient with organic carbon.
Noor ... Abdi; Hasan Madah arefi; Ghava din Zahedi amiri
Volume 15, Issue 2 , January 2008, , Pages 269-282
Abstract
Atmospheric carbon dioxide concentrations have substantially increased in recent decades. Land management practices, however, offer opportunities to mitigate the rise in atmospheric CO2 concentration through sequestration of this additional carbon via storage in plant biomass and soil organic matter ...
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Atmospheric carbon dioxide concentrations have substantially increased in recent decades. Land management practices, however, offer opportunities to mitigate the rise in atmospheric CO2 concentration through sequestration of this additional carbon via storage in plant biomass and soil organic matter in a process termed terrestrial C sequestration. Rangelands ecosystems have a large potential to sequester C because they occupy about half of the world's land area. In Iran, the Astragalus rangelands with about 17 million hectare area have 10% of the country land area and have the important role in carbon sequestration. In order to investigation the role and potential of Astragalus rangelands in carbon sequestration, a study was carried out at a key area of Astragalus verus-Bromus tomentellus vegetation type in Malmir rangeland site, Shazand township of Markazi province and the content of aboveground and underground biomass carbon, litter carbon and soil organic carbon was determined. The results showed that the total carbon sequestration per hectare was 32.95 ton and 87.43 % of total carbon sequestration was soil organic carbon. The results of biomass carbon distribution showed that the carbon content in aerial biomass was higher than underground biomass. Correlation and stepwise regression analysis revealed that the content of carbon sequestration was positively related to Astragalus height and volume, aerial and underground biomass, total biomass, litter amount and soil organic carbon (SOC) content. It was concluded that the Astragalus rangelands have a large potential to sequester carbon and the soil is most important sink for organic carbon storage in this rangelands