مدل‌سازی ریاضی و مقایسه تنفس ناشی از بستره در دو خاک جنگلی و کشاورزی

آب و خاک

مقاله 6، دوره 32، شماره 5 - شماره پیاپی 61، دی 1397، صفحه 919-930   

نوع مقاله: مقالات پژوهشی

شناسه دیجیتال (DOI): 10.22067/jsw.v32i5.68908

نویسندگان

محسن برین^* ؛ احسان احسان ملاحت؛ فرخ اسدزاده

دانشگاه ارومیه

چکیده

یکی از ویژگی‌های مهم در ارزیابی جمعیت فعال میکروبی خاک تنفس ناشی از بستره (SIR) می‌باشد. این مطالعه با هدف بررسی تأثیر منبع کربن (گلوکز)، دما و دوره خواباندن در تنفس ناشی از بستره در دو خاک جنگلی و کشاورزی با استفاده از روش سطح پاسخ و بر مبنای طرح مرکب مرکزی انجام شد. بدین منظور دامنه‌های متفاوتی از این سه متغیر شامل مقدار گلوکز (10-5/0 میلی‌گرم در گرم)، زمان خواباندن (10-1 ساعت) و دما (30-15 درجه سلسیوس) در نظر گرفته شده و طرح مرکب مرکزی با 40 آزمایش برای دو خاک و بر اساس مقادیر کدبندی شده متغیرهای مستقل طراحی شد. نتایج نشان داد که میانگین مقدار SIR خاک جنگلی به دلیل دارا بودن ماده آلی بیشتر و جمعیت فعال میکروبی بالاتر تقریباً دو برابر خاک کشاورزی است. نتایج بیانگر کارآمدی مدل طراحی شده برای پیش‌بینی مقدار تنفس ناشی از بستره در دو خاک کشاورزی (919/0 =R2) و جنگلی ( 823/0 =R2) بود. از بین سه متغیر مورد بررسی در مدل طرح مرکب مرکزی، تاثیر خطی دما بر تنفس ناشی از بستره در هر دو خاک معنی‌دار بود. با این حال در خاک جنگلی مقدار بستره (گلوکز) تأثیر بسیار معنی‌دار و به مراتب بیشتری در مقایسه با خاک زراعی داشت که می‌تواند به دلیل بیشتر بودن مواد آلی قابل تجزیه در این خاک باشد.

کلیدواژه‌ها

تنفس خاک؛ جمعیت میکروبی؛ سطح پاسخ؛ کیفیت خاک

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