اثر سامانه آگروفارستری بر خصوصیات لایه سطحی خاک (مطالعه موردی منطقه بیارجمند- استان سمنان)
محورهای موضوعی : بوم شناسی گیاهان زراعی
سید جواد آمیقی
1
(کارشناس ارشد دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.)
حمید رضا عسکری
2
(استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.)
واحد بردی شیخ
3
(استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.)
کلید واژه: سیستم آگروفارستری, ترسیب کربن, خصوصیات خاک,
چکیده مقاله :
این تحقیق در دو منطقه زیر درختان و بین درختان در مزرعه دارای سیستم آگروفارستری به همراه مزارع اطراف (به عنوان شاهد) که فاقد سیستم آگروفارستری بودند، در جنوب بیارجمند صورت گرفت. برای نمونه برداری به روش سیستماتیک – تصادفی (از پای درختان، بین درختان و منطقه شاهد)، تعداد 20 نمونه خاک از دو عمق (25 – 0 و 50 – 25 سانتیمتر) از مناطق مورد نظر برداشت گردید و مقادیر کربن ترسیب شده در خاک اندازه گیری شد. همچنین در این مطالعه رابطه بین برخی از فاکتورهای فیزیکی و شیمیایی خاک با کربن آلی خاک مورد بررسی قرار گرفت. نتایج نشان داد که میزان ترسیب کربن در واحد سطح در زیر درختان حدود 31 تن بیشتر از بین درختان (42 تن در هکتار) بود. همچنین میزان کل کربن اندازه گیری شده در بین درختان نیز بهصورت معنی داری بیشتر از مزرعه شاهد (4/7 تن در هکتار) بود. همچنین مقدار کربن ترسیب شده در لایه اول (عمق 25-0 سانتیمتر) زیر درختان و بین درختان بیشتر از لایه دوم (عمق 50-25 سانتیمتر) بود. نتایج تجزیه رگرسیون گام به گام کربن آلی با عوامل دیگر بررسی شده خاک نشان داد که تجمع کربن در خاک به علت تغییر pH خاک بوده است. ماسه و نیتروژن نیز در درجه بعدی اهمیت قرار گرفته و بهترتیب 4/13 و 6/5 درصد از تغییرات مقدار کربن را توجیه کردند.
This study is carried out in two sites under agroforestry system (under tree canopy and between tree rows) and in a farmland without tree plantation for determination soil carbon storage in South Biarjomand region, Semnan province, Iran. Soil samples were taken through systematic-random method from two depths (0-25 and 25-50 cm) in three different places including under tree canopy, between trees and control area. Relationship between some physical and chemical properties of soil and its organic carbon content was also studied. Results showed that carbon storage (sequestration) under tree canopy was 31 ton.ha-1 higher than that in between tree rows (42 ton.ha-1). Also, total carbon storage in between tree rows was significantly higher than that in the control (7.4 ton.ha-1). Besides, carbon sequestration was higher in the first soil surface layer (0-25 cm) in under tree canopy and between tree rows. Stepwise regression analysis also showed that pH was the most effective factor in carbon sequestration and soil nitrogen and sand were placed in the second class with 13.4 and 5.6 % lmpact, respectively.
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