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

Document Type : Research Paper

Authors

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

Abstract

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. 

Keywords


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