Plants' use of different nitrogen forms in response to crude oil contamination |
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Authors: | Nie Ming Lu Meng Yang Qiang Zhang Xiao-Dong Xiao Ming Jiang Li-Fen Yang Ji Fang Chang-Ming Chen Jia-Kuan Li Bo |
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Institution: | a Coastal Ecosystems Research Station of the Yangtze River Estuary, Ministry of Education, Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, PR China b Centre for Watershed Ecology, Institute of Life Science, Key Laboratory of Poyang Lake Environment and Resource Utilization, Nanchang University, Nanchang 330031, PR China c College of Life and Environment Sciences, Shanghai Normal University, Shanghai 200234, PR China |
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Abstract: | In this study, we investigated Phragmites australis’ use of different forms of nitrogen (N) and associated soil N transformations in response to petroleum contamination. 15N tracer studies indicated that the total amount of inorganic and organic N assimilated by P. australis was low in petroleum-contaminated soil, while the rates of inorganic and organic N uptake on a per-unit-biomass basis were higher in petroleum-contaminated soil than those in un-contaminated soil. The percentage of organic N in total plant-assimilated N increased with petroleum concentration. In addition, high gross N immobilization and nitrification rates relative to gross N mineralization rate might reduce inorganic-N availability to the plants. Therefore, the enhanced rate of N uptake and increased importance of organic N in plant N assimilation might be of great significance to plants growing in petroleum-contaminated soils. Our results suggest that plants might regulate N capture under petroleum contamination. |
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Keywords: | Fertilization Nitrogen Petroleum contamination Phragmites australis Stable isotopes |
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