فهرست مطالب soroush kiani ghalehsard

Climate change affects agricultural production and , consequently, agricultural factors such as food security and economic well-being. In this study , by distinguishing between different aspects of climate change, the effects of four climate change assumptions, climate variability, climate change , variability and climate change on food security and economic well-being during the years of 2001-2016 were investigated and by using the cost and production information of three products of food security index in Iran (wheat , rice and potatoes) , using the Positive Math Planning (PMP) method was used. The results of this study showed a sharp decrease in farm incomes and a surplus of economic welfare as well as an increase in the price of the product under the fourfold assumptions. In four assumptions examined , the average of total income 43979.4 , 127241.9 , 157960.1 and 272367.1 million Tomans was reduced , the price of the desired product 332.95, 343.7, 565.18 , and 1160.86 one thousand Tomans was increased , and the total of economic welfare surplus decreased 927884.4, 1542416, 2016383 and 2356754 million Tomans, respectively. Reducing the effects of climate change can be achieved by changing the pattern of cultivation , using modern irrigation methods and desertification.

Climate change is crucially important in Iran given its arid and semiarid climate. It influences water resources, thereby affecting many activities and even threatening human life seriously. The assessment of the extent to which climate change can influence water use and resources can play a decisive role in macro-policymaking. Present study uses positive mathematical programming (PMP) in the context of four climatic scenarios (normal climate change, climate change, climate variability, and concurrent climate change) to explore impacts of these changes on agricultural water use and water resources of Iran in a 20-year period. The results showed that in the context of concurrent climate change and also climate change, in spite of the decrease in water use by the agricultural sector, water resources of Iran are reduced with much higher rate than that under other climatic conditions. According to results, average annual agricultural water use under four studied scenarios will be 35,103.65, 26,533.8, 35,216 and 26,510.69 million m3, and average rate of annual loss of water resources will be 4,422.2, 11,165.6, 4,438.24, and 11,267.45 million m3, respectively. Accordingly, changes should be applied in approach to water demand and supply management. Also, policies should be adopted to cope with climate change.

Climate change as an unavoidable challenge affects many different natural and human aspects and requires serious planning in this regard. One of the sectors that is heavily dependent on such changes is the agricultural sector and its development. The impact of this sector and, consequently, the development of these changes means a change in production and hence the price of farmers’ products and incomes, and requires planning in this regard. In this study, using data on the production of five major crops in Iran and also data on weather and climate during the period of 1394-1379, the impact of climate change on Iranian agricultural development and its proper planning to address these changes has been addressed. Therefore, considering four different climate scenarios and using a positive mathematical programming approach, this goal has been investigated for 20 years. The results of the research show that the two scenarios of climate change and combined climate variability and climate change have the most effect on the indexes studied. According to these results, in the scenarios 1-4, the area under cultivation is 1965.8, 1416.14, 1972.9 and 1414.7 thousand hectares respectively, the average net income is 12853.6, 10842.9, 12879.1 and 10873.52 billion Toman. The average price per tonne of products will be 8.07, 9.9, 8.06 and 9.91 million Toman.Therefore, for managing climate change and reducing its negative impacts on agricultural development, suggestions such as urgent and urgent planning for water management, changes in macroeconomic management planning and changes in policy making in the agricultural economy are one of the suggestions is to adapt to climate change and manage its negative impacts on agricultural development.