فهرست مقالات desert areas

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  1 - Defining Economic Values of Important Traits in One Hump Camel in Desert Areas Rearing System
  م. وطن خواه ع. شفیع نادری م.ر. مفیدی ع.ا. قره داغی م.ع. عباسی
  In this study production, reproduction, population, management and economic parameters resulted from recording of 7 flocks with size 57 to 400 and 721 heads of camels in a cycle of reproduction, during three years from 2011 to 2013 were used to find out of the economic چکیده کامل

  In this study production, reproduction, population, management and economic parameters resulted from recording of 7 flocks with size 57 to 400 and 721 heads of camels in a cycle of reproduction, during three years from 2011 to 2013 were used to find out of the economic values of important traits in one hump camel in desert areas rearing system. The economic traits that appeared in profit equation were durability, reproduction and production traits. The economic values, economic weights and the relative importance of traits estimated by increasing one unit and one genetic standard deviation of each trait, using maximizing profit, maximizing efficiency and minimizing cost situations. The results showed that from total annual revenue in each camel (294.10 US$), 66% accounted for sale of calf and 34% resulted from the sale of culling camels. The total annual cost in each camel (72.95 US$), feed, labour and management, facilities, drug and treatment and interest of investment accounted by 40.23%, 34.49%, 7.18%, 1.42% and 16.67%, respectively. The average annual profit and profit to cost ratio in each camel were equal to 221.15 US$ and 3.03, respectively. Relative importance of different group of traits for average of the herds were 58.44% for durability traits (survival rate in camel 14.31%, survival rate in calf to weaning age 34.74% and longevity of camel 9.39%), 24.33% for reproduction traits (conception rate 14.31%, calving interval -8.99%, and age at first calving -1.03%) and 17.23% for production traits (calf weaning weight 13.60%, weight of female replacement -1.09% and weight of camel 2.53%). Relative importance of durability traits resulted from maximizing efficiency and minimizing cost decrease steadily and added to the relative importance of reproduction and production traits. The estimated relative importance of different traits got in this study, could be used to form multiple trait selection indices to one hump camel breeding programs in desert areas rearing system. پرونده مقاله
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  2 - Potential of Carbon Sequestration of Hammada salicornica Vegetation Type in Desert Areas (Case Study: South Khorasan, Iran)
  Hossein Tavakoli
  Climate change due to increasing the level of greenhouse gases including CO2 is the main environmental issue of the world in the new century. One of the effective way for reducing atmospheric CO2 is carbon sequestration by plants and soils. A vast area of Iran has deser چکیده کامل

  Climate change due to increasing the level of greenhouse gases including CO2 is the main environmental issue of the world in the new century. One of the effective way for reducing atmospheric CO2 is carbon sequestration by plants and soils. A vast area of Iran has desert condition with special adapted plant species in which can be devoted for carbon sequestration. Hammada salicornica as a shrub plant of chenopodiaceae grows as dominant or key species of vegetation types in many parts of desert areas in south of country. So, potentials of carbon sequestration of H. salicornica vegetation types were estimated in seven sites in South Khorasan provice, Iran. For this purpose, 113 individual plants were measured for height, and long and short diameters of plant crown area and then were cut from ground level. To estimate underground biomass, roots of 10 individual plants were pulled from soil by digging the root zone. Dry matter production of shoots and roots were weighted and some samples were burned for determination of organic carbon. Organic carbon of soil of three sites were measured by soil sampling. Results showed that carbon has been sequestered between 133 to 3293 kg/ha in different sites in which James and Sefarsakh had the highest and the lowest amount of organic carbon in plant vegetation parts. Soil organic carbon obtained about 6313 kg/ha on average. The best linear regression equation (R2=0.90) for estimating aerial biomass of H. salicornica obtained by using crown area in the equation. It seems that conservation of natural vegetation of H. salicornica and or restoration of degraded lands by this plant, have good potentials for carbon sequestration for globally action commitment and providing benefits such as forage and fuel for local people. پرونده مقاله