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Short-term enhancement effect of nitrogen addition on microbial degradation and plant uptake of polybrominated diphenyl ethers (PBDEs) in contaminated mangrove soil

Author:
Chen, Juan, Zhou, Hai Chao, Wang, Chao, Zhu, Chun Quan, Tam, Nora Fung-Yee
Source:
Journal of hazardous materials 2015 v.300 pp. 84-92
ISSN:
0304-3894
Subject:
Aegiceras corniculatum, ammonium chloride, bacteria, bioavailability, biodegradation, mangrove soils, nitrogen, nitrogen content, phytoremediation, polluted soils, polybrominated diphenyl ethers, rhizosphere, tissues, urease
Abstract:
Effects of nitrogen (N) addition on the microbial degradation and uptake of a mixture of BDE-47 and -209 by Aegiceras corniculatum, a typical mangrove plant species were investigated. At the end of 3-month experiment, a significant dissipation of BDE-47 was observed in the planted soil, and this dissipation, particularly in rhizosphere soil, was significantly accelerated by the frequent addition of N in the form of ammonium chloride. The removal percentage of BDE-47 in the rhizosphere soil without N addition was 47.3% and increased to 58.2% with N. However, the unplanted soil only removed less than 25% BDE-47, irrespective to N supply. The N addition in planted treatments significantly increased soil N content, urease and dehydrogenase activities, and the abundances of total bacteria and dehalogenating bacteria, leading to more microbial degradation of BDE-47. The N addition also enhanced the root uptake and translocation of PBDEs to above-ground tissues of A. corniculatum. These results suggested that N addition could enhance the phytoremediation of BDE-47-contaminated soil within a short period of time. Different from BDE-47, BDE-209 in all contaminated soils was difficult to be removed due to its persistence and low bioavailability.
Agid:
5464592