زین العابدین اميدمهر


اين مطالعه به­منظور بررسی جريان انرژی و پتانسیل گرمايش جهانی مزارع آفتابگردان (Helianthus annuus L.) در شهرستان ميامي انجام شد. اطلاعات لازم در مورد سه روش کاشت مرسوم، روش كم‌خاك‌ورزي و كاشت مستقيم از طريق مصاحبه حضوري و تكميل پرسش‌نامه در سال 1389 تهیه شد. پس از جمع‌آوري اطلاعات، پارامترهاي مربوط به انرژي و پتانسیل گرمايش جهانی ناشی از انتشار گازهای گلخانه‌ای بر مبنای معادل دی اکسید کربن محاسبه گرديد. نتايج نشان داد که میزان انرژی ورودی در سه روش کاشت مرسوم، روش كم‌خاك‌ورزي و كاشت مستقيم به ترتيب برابر 13971، 12117 و 10865 مگاژول بر هكتار بود. در هر سه روش در مقايسه با ساير نهاده‌ها،كود نيتروژن و سوخت مصرفي بيشترين سهم انرژي ورودي را داشتند. بيشترين و كمترين میزان بهره‌وری انرژی به ترتيب مربوط به كشت مستقيم (15/0 كيلوگرم بر مگاژول) و کشت رايج (11/0 كيلوگرم بر مگاژول) بود. كمترين مقدار پتانسيل گرمايش جهاني از روش كاشت مستقيم به ميزان 1449 كيلوگرم معادل دي اكسيد كربن در هكتار بود. در روش مرسوم و كم‌خاك‌ورزي، پتانسیل گرمايش جهانی حاصل از مصرف سوخت بيشترين مقدار تولید گازهای گلخانه‌ای به ترتيب 3/43 و 5/36 درصد از كل توليد گازهاي گلخانه‌اي  را به خود اختصاص داده است. در روش كاشت مستقيم، پتانسیل گرمايش جهانی حاصل از مصرف كود نيتروژن بيشترين مقدار تولید گازهای گلخانه‌ای (3/47 درصد) را به خود اختصاص داد. با توجه به نتايج بدست آمده مديريت عمليات زراعي با رويكرد حذف عمليات اضافي (كاهش مصرف سوخت) و مديريت مصرف كود نيتروژن، به­منظور افزايش بهره‌وري انرژي،كاهش توليد گازهاي گلخانه‌اي و اثرات زيست‌محيطي ضروري است.

جزئیات مقاله

کلمات کلیدی

انتشار گازهاي گلخانه‌اي, خاك‌ورزي, دي ‌اكسيد كربن, كشت مستقيم

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ارجاع به مقاله
اميدمهرز. ا. (2018). مقايسه بهره‌وري انرژي و پتانسيل گرمايش جهاني در نظام‌هاي توليد آفتابگردان (Helianthus annuus L.) ديم. بوم شناسی کشاورزی, 11(2), 739-755. https://doi.org/10.22067/jag.v11i2.49739
نوع مقاله
علمی - پژوهشی