بررسی اثربخشی راهکارهای مدیریتی کاهش مصرف آب کشاورزی با استفاده از مدل AquaCrop (مطالعه موردی: دشت هشتگرد)

رجا, امید; ویسی, سجاد; برزگر, علی

doi:10.22092/idser.2024.367320.1595

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ محقق، موسسه تحقیقات فنی و مهندسی کشاورزی، سازمان آموزش و ترویج کشاورزی، کرج، ایران.

² کارشناس منابع آب، شرکت آب منطقه ای البرز، کرج، ایران.

10.22092/idser.2024.367320.1595

چکیده

استفادۀ مناسب از منابع آب در بخش کشاورزی نیازمند آگاهی از راهکارهای مدیریتی بهینه و کارآمد آب است. مدیریت وضعیت کنونی دشت هشتگرد در استان البرز حاصل عملکرد مجموعه ‏ای از عوامل انسانی و طبیعی طی دهه ‏های گذشته است و احیا و تعادل‏ بخشی آب زیرزمینی دشت در اولویت‏ قرار دارد. بر اساس آمار درازمدت سطح آب زیرزمینی (99-1370) میزان کسری مخزن در هر سال به طور متوسط برابر با 16/82 میلیون مترمکعب (6/2 درصد) است. در این مطالعه از مدل AquaCrop برای شبیه سازی عملکرد محصولات غالب زراعی و مقدار آب مصرفی در منطقۀ هشتگرد استفاده شد. راهکارهای عملی و کم‌هزینه نیز برای صرفه ‏جویی در مصرف آب با حداقل هزینه مانندبهبود راندمان آبیاری براساس وضع موجود، تغییر تاریخ کاشت و الگوهای مختلف کم ‏آبیاری بررسی شد. واسنجی مدل AquaCrop برای شرایط منطقه‌ای و بر اساس عملکرد محصولات زراعی نشان داد این مدل به‏خوبی توانسته است عملکرد محصولات زراعی موردمطالعه را با کم‏ترین خطای نسبی (RE) برای گندم، جو، ذرت علوفه ‏ای و یونجه برای دشت هشتگرد در مرحلۀ واسنجی مدل شبیه ‏سازی کند. بررسی ها نشان داد با توجه به سطوح ارتقای راندمان در مناطق مختلف و برای کشت ‏های مختلف به ترتیب منجر به صرفه‏جویی به میزان 17/7 میلیون مترمکعب (5/9 درصد) در مصرف آب تخصیصی خواهد شد که می ‏تواند در شرائط کم ‏آبی در تامین آب مورد نیاز راسطح بیشتری از اراضی بدون کاهش عملکرد فراهم کند. نتایج تحقیق نشان داد با انتخاب تاریخ کاشت بهینه (باتوجه به دامنۀ تاریخ کشت متداول در منطقه) برای محصولات غالب محدوده دشت هشتگرد نیاز ناخالص آبیاری به میزان 2/4 میلیون مترمکعب در مصرف آب (0/8 درصد) کاهش می یابد. گزینۀ دیگر مدیریتی، کم ‏آبیاری تحت الگوهای مدیریتی مختلف برای محصولات غالب زراعی، نشان داد با کاهش عمق آب آبیاری و نیز با افزایش دورهای آبیاری، صرفه‏ جویی قابل توجهی در میزان آب مورد نیاز قابل دستیابی است. با کم ‏آبیاری می‏توان به میزان 19/3 میلیون مترمکعب (6/0 درصد) در دشت هشتگرد در مصرف آب صرفه ‏جویی کرد. نتایج به دست آمده نشان می‏ دهد در بسیاری از مواقع می ‏توان بدون رفتن زیر بار هزینه ‏های کلان برای تامین امکانات و تجهیزات مدرن، در شرایط مدیریتی برتر موجود در منطقه با اعمال سناریوهای مختلف از جمله بهبود راندمان، تغییر تاریخ کاشت و کم ‏آبیاری در مصرف آب آبیاری مورد نیاز صرفه ‏جویی قابل توجهی کرد. طبیعتاً سهم هر کشت در میزان صرفه ‏جویی متناسب با متوسط آب مصرفی در هکتار و سطح اراضی تحت هر کشت است.

کلیدواژه‌ها

موضوعات

منابع و مصارف آب

عنوان مقاله [English]

Evaluation the effectiveness of management strategies to reduce agricultural water use by using the AquaCrop model (case study: Hashtgerd plain)

نویسندگان [English]

Omid Raja ¹
Sajjad Veysi ²
Ali Barzegar ²

¹ Researcher, Agricultural Engineering Research Institute (AERI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

² Water Resources Specialist, Regional Water Company of Alborz, Karaj, Iran

چکیده [English]

Extend Abstract
Intouduction
Many factors have contributed to the drop in the water table of groundwater, including the increase in cultivated area, decrease in rainfall, climate change, and the continuation of drought in recent years, and withdrawing excessive amounts of surface water sources and groundwater from unauthorized wells, which has faced serious challenges in the water sector in Alborz province. The Hashtgerd plain is located in the Alborz province. The current situation of the Hashtgerd plain is the result of a series of human and natural factors over the past few decades, and the restoration and balance of the underground water of the plain is a priority. According to long-term statistics, the groundwater level has decreased by 19.8 m in 29 years (1990-2019) on average, there is a drop in the groundwater level of about 68 cm. per year. The total aquifer deficit is 487.85 million cubic meters, and the average annual amount of the aquifer deficit is 16.82 million cubic meters (6.2%). Given these conditions, it is essential to apply effective solutions for optimal and efficient water management.
Methodology
The purpose of this study was to provide practical and low-cost solutions to save water consumption in Hashtgerd Plain. There are different solutions with minimal cost, such as improving irrigation efficiency, changing the planting date, and different patterns of deficit irrigation. The approach of this study is to present and examine solutions that do not require changing the irrigation system or even changing the cultivation pattern and also not reducing the cultivated area in the region. It is the examination of the solutions that can be implemented at the lowest possible cost without adversely affecting the livelihood of farmers. The objective of the study was to reduce water consumption or prevent from excessive groundwater of Hashtgerd plain aquifer. The proposed solutions do not require new tools such as precision leveling machines and, so on. Each of the above strategies was evaluated based on the actual conditions in the region. The main objective was to evaluate and estimate the water requirements of the dominant crops in the Hashtgerd Plain, and to present different scenarios for improving irrigation efficiency according to the superior conditions in the region. The feasibility of saving water consumption through strategies to change the planting date and deficit irrigation was evaluated using the AquaCrop 6.0 model.

Results and discussion
In this study, the AquaCrop model was used to simulate the yield of crops and the amount of water use in the region. The calibration of the AquaCrop model for regional conditions has demonstrated that the AquaCrop model is capable of predicting crop yield with the lowest relative error (RE) for wheat, barley, fodder corn, and alfalfa for the plains during the calibration phase of the simulation model. According to the levels of efficiency improvement in different regions and for different crops, it will lead to savings of 17.7 million cubic meters (5.9%) in the amount of allocated water consumption. This will can provide the possibility of supplying water to a larger area of land without reducing yield under water scarcity conditions. The outcomes of the scenario involving a change in planting date through AquaCrop model simulation demonstrated that this management pattern has the potential to reduce water consumption by 2.4 million cubic meters (0.8%) in the region. In addition, different levels of deficit irrigation can save 19.3 million cubic meters of water consumption.
Conclusion
The obtained results show that in many cases, it is possible to provide without modern facilities and huge costs, applying different scenarios such as improving efficiency, changing planting dates and deficit irrigation has achieved significant savings in the required irrigation water consumption. Naturally, the share of each crop in the amount of savings is proportional to the average water consumption per hectare and the area of land under each crop. In general, the AcuCrop model can be used as a practical tool for simulating crop yield and evaluating management scenarios.

کلیدواژه‌ها [English]

Alborz Province
Irrigation Efficiency
Deficit Irrigation
Optimal Planting Date
Water Saving

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تحقیقات مهندسی سازه های آبیاری و زهکشی

بررسی اثربخشی راهکارهای مدیریتی کاهش مصرف آب کشاورزی با استفاده از مدل AquaCrop (مطالعه موردی: دشت هشتگرد)

مراجع

مراجع

دوره 25، پاییز - شماره پیاپی 96
آذر 1403
صفحه 26-1

بررسی اثربخشی راهکارهای مدیریتی کاهش مصرف آب کشاورزی با استفاده از مدل AquaCrop (مطالعه موردی: دشت هشتگرد)

مراجع

مراجع

دوره 25، پاییز - شماره پیاپی 96آذر 1403صفحه 26-1

دوره 25، پاییز - شماره پیاپی 96
آذر 1403
صفحه 26-1