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بررسی اثرات تخریب و تغییر کاربری در اکوسیستم مرتعی بر میزان انتشار گازگلخانهای دی اکسید کربن از خاک (مطالعه موردی ذخیرهگاه فندقلوی اردبیل) | ||
| تحقیقات مرتع و بیابان ایران | ||
| مقاله 13، دوره 23، شماره 2، شهریور 1395، صفحه 343-330 اصل مقاله (428.29 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijrdr.2016.107035 | ||
| نویسندگان | ||
| شعله حاج آقا معمار1؛ فرشاد کیوان بهجو* 2؛ کیومرث سفیدی3؛ بهزاد بهتری4 | ||
| 1دانشجوی کارشناسی ارشد مرتعداری، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران | ||
| 2دانشیار، گروه علوم و صنایع چوب و کاغذ، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران | ||
| 3استادیار، دانشکده کشاورزی و منابع طبیعی دانشگاه محقق اردبیلی، اردبیل، ایران | ||
| 4دانشجوی دکتری مرتعداری، دانشکده منابع طبیعی، دانشگاه کشاورزی و منابع طبیعی، ساری، ایران | ||
| چکیده | ||
| اکوسیستمهای زمینی نقش مهمی در تنظیم غلظت گاز گلخانهای دیاکسیدکربن دارند. تغییر و تخریب اکوسیستمها قادر به تغییر میزان انتشار این گاز است. هدف از پژوهش، بررسی میزان انتشار دیاکسیدکربن و سرعت معدنی شدن کربن خاک دراثر تغییر کاربری اکوسیستم در ذخیرهگاه جنگلی فندقلوی اردبیل بود. به این منظور از مرتع چرا شده، مرتع تخریب شده و زمین زراعی که در مجاور هم قرار داشتند، نمونهبرداری خاک از سه عمق0 تا 30 برداشت شد. انتشار دیاکسیدکربن در جریان انکوباسیون با روش جذب قلیا تعیین شد. بالاترین میزان انتشار دیاکسیدکربن و سرعت معدنی شدن کربن در مرتع چرا شده، عمق 10 تا 20 سانتیمتری با مقدار عددی بترتیب 968/0 (mg CO2 g-1 soil) و 00314/0 (mol C kg-1soil d-1) و کمترین مقادیر در مرتع تخریب شده عمق 0تا 10 با مقادیر عددی به ترتیب4693/0(mg CO2 g-1 soil)و 0015/0(mol C kg-1 soil d-1)مشاهده شد که تفاوت معنی داری با تمامی اکوسیستمها در سطوح مختلف عمقی نشان داد. با توجه به نتایج میتوان گفت فعالیت میکروارگانیسمها در تجزیه مواد آلی، در اکوسیستمهای مورد بررسی، تفاوتهای معنیداری داشتند. پویایی پوشش گیاهی و بازگشت ریشههای ظریف به خاک مرتع چرا شده سبب بالا بودن انتشار گاز شده است. در اکوسیستم زراعی به دلیل شرایط نسبتاً مرطوب منطقه و عدم برگشت ماده آلی به خاک، تجزیه ماده آلی غیر قابل دسترس توسط میکروارگانیسم ها سبب کاهش ماده آلی خاک و کم بودن انتشار دی اکسید کربن شده است. | ||
| کلیدواژهها | ||
| انکوباسیون؛ جذب قلیا؛ معدنی شدن کربن؛ میکروارگانیسم | ||
| عنوان مقاله [English] | ||
| Impact of land use management on soil CO2 greenhouse gas emissions (Case studyFandoghloo Forest Reserve) | ||
| نویسندگان [English] | ||
| Shole Haj agha Memar1؛ Farshad Keivan Behjou2؛ Kiomars sefidi3؛ Behzad Behtari4 | ||
| چکیده [English] | ||
| The aim of this study was to investigate the impact of ecosystem change on emissions and carbon mineralization rate in Fandoghloo region. Soil sampling was performed at three depths (0-30 cm) from the grazing rangeland ecosystem, degraded rangeland ecosystem, and agricultural, ecosystem. Carbon dioxide emissions were measured during incubation with alkali absorption method. The highest and lowest emissions of carbon dioxide and carbon mineralization rate were obtained in the grazing rangeland ecosystem (0.968 mg CO2 g-1 soil and 0.00314 mol C kg-1 soil d-1), and the degraded rangeland ecosystem (4693 mg CO2 g-1 soil, and 0.0015mol C kg-1 soil d-1), respectively, showing a significant difference with other ecosystems at different depth levels. According to the results, significant differences were found for the activity of microorganisms in decomposition of organic matter in the study ecosystems. The dynamics of vegetation and returned fine roots caused high emissions of CO2 in soil of grazing rangeland ecosystem. In the agricultural ecosystem, due to the relatively wet conditions and failure to return organic matter to the soil, the decomposition of inaccessible organic matter caused to decreased soil organic matter and low carbon dioxide emissions. | ||
| کلیدواژهها [English] | ||
| Microorganism, Organic Matter, Carbon mineralization, Incubation, alkali absorption | ||
| مراجع | ||
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