期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 300, 期 -, 页码 84-92出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.06.053
关键词
Ammonium-N; Microbial degradation; Persistent toxic organic pollutant; Plant uptake; Translocation
资金
- Research Fund from City University of Hong Kong [7004206]
- State Key Laboratory in Marine Pollution [9360136]
- Science, Technology and Innovation Committee of the Shenzhen Municipality [9680078]
- Hong Kong Scholars Program [XJ2013037]
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. (C) 2015 Elsevier B.V. All rights reserved.
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