Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Environ Pollut. 2015 Oct;205:1-7. doi: 10.1016/j.envpol.2015.05.016. Epub 2015 May 17.
Rice and the distinctive cultivation practices employed in rice growth can significantly influence the environmental fate of polybrominated diphenyl ethers (PBDEs) in a paddy field. We studied variations in PBDE concentrations in multiple compartments of a paddy field in the suburban area of Guangzhou, South China, including air, soil, water, and rice tissues. The input/output fluxes of air-surface and air-foliage exchange, atmospheric deposition and water input during different rice growth stages were measured simultaneously. Air-foliage and air-water diffusion exchanges were the key processes controlling inputs and outputs of PBDEs in paddy fields, respectively, whereas atmospheric deposition dominated inputs of higher brominated PBDEs. The high input of PBDEs via air-foliage exchange suggested that vegetation can significantly increase the air-to-field transport of PBDEs in ecosystems. The annual input of PBDEs in all paddy fields in Guangdong Province was estimated to be 22.1 kg.
水稻及其生长过程中的特殊种植方式会显著影响稻田中多溴二苯醚（PBDEs）的环境归宿。我们研究了华南广州市郊区一个稻田中多个隔室中 PBDE 浓度的变化，包括空气、土壤、水和水稻组织。同时测量了不同水稻生长阶段空气-表面和空气-叶片交换、大气沉积和水输入的输入/输出通量。空气-叶片和空气-水扩散交换分别是控制稻田中 PBDEs 输入和输出的关键过程，而大气沉积则主导了高溴代 PBDEs 的输入。通过空气-叶片交换输入大量的 PBDEs 表明，植被可以显著增加 PBDEs 在生态系统中的空气向农田的传输。估计广东省所有稻田中 PBDEs 的年输入量为 22.1 千克。
