Abstract
South Khorasan province in connection with the carrying capacity of pastures studies as well as for the forests of the province except the ranch ability to harvest timber does not exist and according to local conditions and drought conditions should protect forests made way support work for it to be applied. Despite the limitations and problems specific to the province, the province is desert country, has a lot of potential value that is specific ecological conditions of the region. Because of this special situation and Mykrvaqlym that the general climate is desert province, valuable forest habitats of many species Iran, Turan are eligible, this change reflects the diversity of plant species and in terms of productivity and drug use, this diversity is one of the significant features of the province. So far in South Khorasan province for the 1732714 hectares of rangeland products is conducted in 27 regional habitats. The amount of usable area of 16163 hectares has been detected. As the number of products of rangeland habitats and the habitats of the 27th district of rangeland products to 1,732,714 hectares against 161,630 hectares of rangeland and usable products and the product is estimated at 262,606 kg. From the areas of natural resources such as pasture, province with an area of 7920042 hectares of a total of 652 tons of harvested forage is available.
Highlights
Rangelands cover an area of 54.8% of the country's total land area
In the process of environmental management development, the concept of the breadth of capacity was first understood by biological and bio-physical concepts, so that the discussion of the breadth of resources was mainly used in the management of pastures and pastures and in order to estimate the ecological capacity of the pastures
This concept in the forestry sector is equivalent to the acceptable level of production per cubic meter per hectare per year, and in the case of aquaculture equivalent to the acceptable level of harvesting from a catch in a predetermined volume per year in a way that allows the replacement of caught in the year there is defined [3]
Summary
Rangelands cover an area of 54.8% of the country's total land area. These lands are subject to severe degradation for a variety of reasons, including mismatches of harvesting capacity [1]. Determining the daily metabolic energy of a livestock unit using pasture and estimating the average metabolic energy of one kilogram of dry forage, the amount of forage required per livestock unit can be determined and based on this, the determination of the rangelands [5]. According to food needs studies, livestock trapped in pastures is 60 to 70 percent more likely to be kept in closed environments [10] This extra energy will be spent on marching forage, reaching the water, salt, shade and climbing slopes. It should be noted that the nutritional requirements of a livestock unit in the measurement of rangeland capacity in our country's current conditions are equivalent to 2 to 1.5 pounds of dry fodder per day. As the main products of forests and rangelands are wood and forage, along with these products, a group of products includes components and parts of some forest and rangeland plants which are classified as forest and rangelands (non-food products) And those products or products other than the production of wood and forage, including: gums, mannes, galls (sub products from plants), roots, tubers, bulbs, airways, Leaves, flowers, fruits and seeds (main members of the plant) that have medicinal, oral and industrial properties [16]
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