طراحی خط مشی کاهش اثرات تخریب زیست‏‌محیطی آبخوان دشت عباس استان ایلام

محیط‌زیست کشاورزی در معرض آسیب ‌های مختلف از جمله شوری خاک و آلودگی آب های زیرزمینی بوده، که از مهم‏ترین دلایل آن تبخیر و تعرق زیاد و مدیریت نامناسب منابع آب است. از این‌‏رو، اجرای سیاست‌ ها یا برنامه‌ های کاهش خسارات راهی برای غلبه بر این چالش زیست ‌محیطی است. با این همه، اجرای درست سیاست هم به ارزیابی مقرون‏‌به‏‌صرفه و هم به حمایت اجتماعی نیاز دارد. هدف مطالعه حاضر بررسی تمایل کشاورزان به پرداخت، تجزیه‌‏وتحلیل منبع ناهمگونی و تعیین اقدامات کشاورزی برای کاهش خسارات زیست‌‏محیطی و مزایای به‏‌دست‏‌آمده از اجرای آنها با استفاده از روش آزمون انتخاب بود. بدین منظور، مدل لاجیت مختلط و کلاس پنهان برای تفکیک ترجیحات اجتماعی ناهمگن به‏‌کار گرفته شد. داده ‌های مورد نظر از طریق مصاحبه حضوری و تکمیل پرسشنامه از 108 بهره ‌بردار دشت عباس استان ایلام در سال 1400 به‌ دست آمد. نتایج نشان داد که تمایل به پرداخت افراد از ویژگی ‌های اقتصادی- اجتماعی (سطح تحصیلات، سن، بعد خانوار، گرایش زیست‏‌محیطی) و عوامل دیگری همانند استفاده از آب چاه تاثیر می‏‌پذیرد. بنابراین، برای بهبود کارآیی و جهان‏‌شمول‌بودن خط مشی، باید تمایل و ناهمگونی ترجیحات عمومی به‏‌طور کامل در تدوین سیاست لحاظ شود. همچنین، بر اساس نتایج به‏‌دست‌‏آمده از مدل لاجیت مختلط و کلاس پنهان، مازاد جبرانی سناریوهای بهبود آبخوان مشخص و محاسبه شد. مقادیر تمایل به پرداخت از سناریوی بهبود متوسط به سناریوی بهبود مطلوب محیط زیست آبخوان افزایش یافت. مازاد جبرانی برای بهبود مطلوب ویژگی ‌ها، به‌‏ترتیب، حدود 98 و 138 هزار تومان ماهانه به ازای هر هکتار برآورد شد. پژوهش حاضر نشان داد که کاهش بیابان‌زایی، کاهش سطح نیزار و حفاظت از کیفیت آب و همچنین، تعداد مشاغل روستایی محافظت‌‏شده، همگی عوامل تعیین‌کننده اولویت‏‌های کشاورزان برای تعیین طرح‌های سیاست جایگزین به‌‏شمار می‏‌روند.

designing a policy to reduce the effects of environmental degradation of dasht abbas plain aquifer in ilam province of iran

introduction: over recent years, environmental sustainability, agriculture and food security have been among the most important topics of global attention. sustainability is based on economic, social and ecological factors. sustainable agriculture requires a sustainable environment. therefore, the main agricultural factors are soil, weather, water resources and nutrients, among which the protection of water and soil resources is more important than others for the efficiency of farmers. although, water resources are essential for the functioning of any economy, they continue to be degraded at an unsustainable rate. this is true for the developed and developing countries due to the nature of their chosen path of economic growth and development. both surface and underground water have characteristics of public goods, because the people who use them do not pay for their scarcity (whether in terms of quality or quantity) and only pay the cost of private extraction (private goods). when the cost of scarcity is not recognized, it leads to further extraction and pollution of resources and thus, inefficient use of them over time and space.materials and methods: the choice experiment (ce) method has its theoretical basis in lancaster’s consumer choice model (lancaster, 1966) and its econometric basis in random utility theory (luce, 1959; mcfadden 1973). lancaster suggested that consumers get their satisfaction not only with simply goods and services but also with their attributes. according to lancaster, demand is defined over the characteristics of goods, rather than goods themselves. in any ce exercise, respondents are thus asked to choose between the different bundles of goods- which could in fact be alternative designs of policy to provide such goods- described in terms of their characteristics (or attributes) and the levels these take. offered choices defined in terms of these attributes, utility maximizing individuals will choose the alternative that gives the highest level of utility. according to the theory of random utility, the utility of a choice includes a deterministic component (v) and an error component (e), which is independent of the deterministic part and follows a predetermined distribution. this error component shows that predictions cannot be made with confidence. the choices that are made between alternatives are a function of the probability that the utility associated with a particular option j (for example, the groundwater pollution reduction program option) is greater than other options:  therefore, the desired data of this study were obtained through face-to-face interviews and the questionnaires filled out by 108 farmers of dasht abbas plain aquifer in ilam province of iran in 2022.results and discussion: the study results showed that the willingness to pay was influenced by socio-economic characteristics (including the level of education, age, household size, and environmental orientation) and other factors such as the use of well water. therefore, to improve the efficiency and universality of the policy, the willingness and heterogeneity of public preferences should be fully considered in policy formulation. also, based on the results obtained from the mixed logit model and hidden class, the compensatory surpluses of the aquifer improvement scenarios were specified and calculated. the willingness-to-pay values increased from the moderate improvement scenario of the aquifer environment to the optimal improvement scenario. the compensatory surpluses for the desired improvement of the features were estimated about 980 and 1380 thousand iri rials per hectare per month, respectively.