دینامیک کربن در خاک شنی آلوده به نفت خام در حضور اشکال مختلف نیتروژن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد بیولوژی و بیوتکنولوژی خاک- دانشکده کشاورزی، دانشگاه شهرکرد

2 دانشیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهرکرد

3 استادیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهرکرد

چکیده

هدف این تحقیق بررسی اثر مصرف همزمان نفت خام و شکل­های نیتروژن بر دینامیک کربن و تعیین تأثیر ویژگی­های خاک شنی بر روند آن بود. آزمایش به صورت فاکتوریل (4×3) و در قالب طرح پایه کاملاً تصادفی در سه تکرار و در شرایط آزمایشگاهی طی 126 روز انجام شد. برای این منظور، ابتدا نمونه­های خاک شنی توسط سطوح صفر، 5 و 10 درصد نفت خام آلوده شده و سپس از نمک­های نیتروژن­دار نیترات پتاسیم، کلرید آمونیوم و مخلوطی از این دو نمک استفاده گردید. نمونه­ها تا پایان آزمایش در دمای 1±25 درجه سلسیوس در داخل انکوباتور نگهداری شدند. سپس هر هفت روز یکبار نمونه­های خاک به منظور انجام آزمایش تنفس میکروبی مورد استفاده قرار گرفتند. نتایج نشان داد افزودن نیتروژن به خاک شنی سبب تحریک جوامع میکروبی خاک می­شود. افزودن همزمان نفت خام و نیتروژن به خاک، اثرات تحریک کنندگی زیادی بر معدنی شدن کربن خاک داشت به طوری که تیمار NH4 و سطح ٪10 نفت خام بیشترین میزان معدنی شدن کربن را به خود اختصاص دادند. به طور خلاصه، نفت خام پس از اضافه شدن به خاک با جامعه خاکزیان اثرات متقابل مثبت و منفی برقرار می­کند. با این حال، کاربرد نیتروژن در شکل مناسب در خاک­های آلوده به نفت خام ممکن است سبب کاهش اثرات مضر ترکیبات هیدروکربنی بر جامعه ریزجانداران خاک گردد.

کلیدواژه‌ها

عنوان مقاله [English]

Carbon Dynamics in a Crude Oil Polluted Sandy Soil in the Presence of Various N Forms

نویسندگان [English]

  • S. Namazi 1
  • Fayez Raiesi 2
  • S. Ghorbani Dashtaki 3
1 Former graduate student of soil biology and biotechnology, Faculty of Agriculture, University of Shahrekord
2 Associate Professor of Department of Soil Science, Faculty of Agriculture, University of Shahrekord
3 Assistant Professor of Department of Soil Science, Faculty of Agriculture, University of Shahrekord
چکیده [English]

The objective of the present study was to investigate the influences of crude oil and various N forms application on C dynamic in a sandy soil. The experiment was conducted as factorial (3×4) arranged in a completely randomized design with three replicates under laboratory conditions during 126 days. Sandy soil samples were first contaminated with 5% and 10% crude oil levels and, then, N salts of KNO3, NH4Cl, and a mixture of them were added. Soil samples were placed at 25±1°C in incubator for 126 days to determine microbial respiration at weekly intervals. Results indicated that N addition to sandy soil would cause soil microbial communities stimulation. The addition of crude oil and N simultaneously, caused the 10% oil level and NH4-treated soils to show the maximum C mineralization. In short, crude oil has positive and negative interactions with soil microorganisms. However, application of N fertilizes in proper form to petroleum-polluted environments may cause the reduction of harmful effects of toxic hydrocarbon compositions on soil microbial communities. 

کلیدواژه‌ها [English]

  • Soil pollution
  • Microbial respiration
  • N form
  • Soil microbial activity
  • Crude oil

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پژوهش های خاک
دوره 25، شماره 4
اسفند 1390
صفحه 307-321

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