ارزیابی و پایش پایداری اکولوژیکی بوم‌نظام‌های زراعی تولید روغن در سیستان با استفاده از تکنیک‌های تحلیل امرژی و اقتصادی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زراعت، دانشکده کشاورزی، دانشگاه زابل، زابل، ایران.

چکیده

به‌منظور ارزیابی سلامت اکولوژیکی و بهره‌وری استفاده از نهاده‌ها در تولید گیاهان روغنی سیستان تولید سه محصول روغنی با اهمیت منطقه شامل کلزا (Brassica napus L.)، گلرنگ (Carthamus tinctorius L.) و کنجد (Sesamum indicum L.) با استفاده از تکنیک‌های تحلیل امرژی و اقتصادی مورد بررسی قرار گرفت. اطلاعات این پژوهش توسط پرسش‎نامه و مصاحبه چهره به چهره با مالکین نظام‌های خرده مالکی برای تعیین میزان مصرف نهاده‌ها و میزان عملکرد آن‌ها گرد‎آوری شد. امرژی کل حمایت‌کننده نظام‌های تولید کلزا، گلرنگ و کنجد سیستان به‌ترتیب 1016×28/7، 1016 ×75/4 و 1016×55/3 ام‌ژول خورشیدی در هکتار در سال به‌دست آمد. بالاترین سهم از ورودی امرژی کل در هر سه نظام مورد مطالعه به ورودی‌های تجدیدناپذیر محیطی مربوط بود که سهم آن برای نظام‌های تولید کلزا 42/83 درصد، گلرنگ 11/80 درصد و کنجد 41/84 درصد به‌دست آمد. مقادیر شاخص‌های امرژی، پایداری زیست‌محیطی (ESI و ESI*)، درصد تجدیدپذیری (%R)، بار زیست‌محیطی (ELR وELR* ) و نسبت سرمایه‌گذاری اصلاح شده (EIR*) در نظام گلرنگ حاکی از پایداری بیش‌تر این نظام می‌باشد. دلیل اصلی سلامت کم‌تر نظام‌های کلزا و کنجد براساس شاخص‌های امرژی، سهم زیاد امرژی ورودی مربوط به تلفات ماده‌آلی و فرسایش خاک که در دسته منابع تجدیدناپذیر محیطی قرار دارند، بود. تحلیل اقتصادی نشان‌دهنده نسبت سود به هزینه و سود خالص بالاتر نظام تولید کنجد نسبت به دو نظام گلرنگ و کلزا بود. نتایج این مطالعه نشان داد که توجه به راهکارهای عملی در مدیریت جامع بوم‌نظام تولیدی به‌ویژه حفاظت از مواد آلی خاک و جلوگیری از فرسایش، می‌تواند در سلامت اکولوژیکی آن‌ها تأثیر چشم‌گیری داشته باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Monitoring and Accounting of Ecological Sustainability of Sistan's Oil Crop using Emergy and Economic Indicators

نویسندگان [English]

  • Narges Pordel
  • Mohammad Reza Asgharipour
  • Esmaeel Seyedabadi
Department of Agronomy, Faculty of Agriculture, University of Zabol, Zabol, Iran
چکیده [English]

Introduction
The application of various inputs, such as pesticides and chemical fertilizers, has been one of the most significant factors negatively impacting the sustainability of agricultural systems. To accurately assess the value of agricultural ecosystem services, both the positive and negative aspects of agricultural systems must be taken into account. In the past three decades, the emergy analysis has been developed for assessing environmental policies and resource quality based on the dynamics of complex environmental and economic systems. Emergy analysis can be used to evaluate the sustainability of agriculture. By definition, emergy is the amount of direct or indirect solar energy required to produce a good or service. By converting all forms of energy, resources, and services into a single unit, the solar emjoule (sej), emergy analysis can assess the interdependence of economic, social, and environmental factors. The production of three important oil crops of Sistan, including rapeseed, safflower, and sesame, was investigated using emergy and economic analysis techniques to evaluate the ecological health and productivity of the use of inputs in the production of oil crops in Sistan.
Materials and Methods
This research was conducted at the level of Sistan's oil plant production systems in the Northern provinces of Sistan and Baluchistan. This research used questionnaires and face-to-face interviews with the owners of small ownership systems to determine the input consumption and performance of these systems. According to their service life, the annual input energy flow in the form of structural facilities, buildings, machinery, and materials used in the systems was calculated. The RUSLE model was used to assess water erosion. Inputs are divided into four categories to analyze production systems: renewable environmental resources (R), non-renewable environmental resources (N), purchased renewable resources (FR), and purchased non-renewable resources (FN). After calculating all input and output flows, the raw data for each of the production systems was multiplied by their unit emergy value in Joules, grams, or Rials, according to Iran's conditions. This study utilized transformity, the renewable emergy ratio (R%), the rmergy yield ratio (EYR), the rmergy investment ratio (EIR), the rnvironmental loading ratio (ELR), the emergy sustainability index (ESI), the emergy exchange ratio (EER), and the emergy index of product safety (EIPS).
Results and Discussion
The total supporting emergy for rapeseed, safflower, and sesame production systems was calculated to be 7.28E+16, 4.75E+16, and 3.55E+16 sej.ha-1.yr-1, respectively. In all three studied production systems, wind emergy was the largest source of free environmental input. In all three studied systems, environmental non-renewable inputs accounted for the largest portion of total emergy input, which was 83.42 percent for rapeseed, 80.11 percent for safflower, and 84.4 percent for sesame. The high proportion of nonrenewable inputs in this study for all three production systems demonstrated the vulnerability of Sistan's landscape cultivation systems as a result of the obvious lack of water, severe soil erosion, and contamination of agricultural lands. The total amount of purchased inputs for rapeseed, safflower, and sesame production systems was estimated to be 1.14E+16, 8.78E+15, and 5.40E+15 sej.ha-1.yr-1, respectively. Nitrogen and phosphorus chemical fertilizers comprised the largest proportion of purchased inputs in all three systems.
The transformity for rapeseed, safflower, and sesame production systems, respectively, was 3.88E+06, 3.76E+06, and 2.48E+06 sej.J-1. The higher transformability of the rapeseed production system was due to the lower input utilization efficiency of this system compared to the safflower and sesame systems. The values of the saffron system's environmental sustainability indices (ESI and ESI*), renewable energy ratio (%R), environmental loading ratios (ELR and ELR*), and modified investment ratio (EIR*) indicate that this system is more sustainable. The lower health of rapeseed and sesame systems based on emergy indices was primarily due to the large proportion of input emergy related to organic matter losses and soil erosion, which are nonrenewable environmental resources. The economic analysis revealed that the sesame production system generated a higher profit-to-cost ratio and net profit than the safflower and rapeseed systems.
Conclusion
This study demonstrated that emphasizing practical solutions in the comprehensive management of production ecosystems, particularly through the protection of soil organic matter and the prevention of erosion, can significantly enhance their ecological health.
 







 




 

کلیدواژه‌ها [English]

  • Economic analysis
  • Environmental burden
  • Environmental inputs
  • Profitability analysis
  • Rapeseed
  • Renewable resources

©2023 The author(s). This is an open access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source.

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دوره 16، شماره 1 - شماره پیاپی 59
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