Cheng Xiu-Yun, Liang Ming-Qiu, Chen Wen-Yin, Liu Xu-Cheng, Chen Zhang-He
Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, and Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou 510631, China.
J Integr Plant Biol. 2009 Mar;51(3):325-35. doi: 10.1111/j.1744-7909.2008.00804.x.
The aim of the present study is to probe the relation between plant growth and its decontamination effect in constructed wetlands. Four species were studied in the small-scale mono-cultured constructed wetlands, which were fed with domestic wastewater. Plant growth indexes were correlated with contaminant removal performance of the constructed wetlands. Wetlands planted with Cyperus flabelliformis Rottb. showed the highest growth indexes such as shoot growth, biomass, root activity, root biomass increment, and the highest contaminant removal rates, whereas wetlands planted with Vetiveria zizanioides L. Nash had the lowest growth indexes and the lowest removal rates. Above-ground biomass and total biomass were significantly correlated with ammonia nitrogen removal, and below-ground biomass with soluble reactive phosphorus removal. Photosynthetic rate had higher correlation with nitrogen removal in these species. Root activity and root biomass increment was more correlated with 5 d biochemical oxygen demand removal. Chemical oxygen demand removal had lower correlations with plant growth indexes. All four species had higher removal rates in summer and autumn. The results suggest that the effect of plant growth on contaminant removal in constructed wetlands were different specifically in plants and contaminants.
本研究的目的是探究人工湿地中植物生长与其净化效果之间的关系。在以生活污水为进水的小型单种人工湿地中对四种植物进行了研究。植物生长指标与人工湿地的污染物去除性能相关。种植风车草的湿地表现出最高的生长指标，如地上部生长、生物量、根系活力、根系生物量增量，以及最高的污染物去除率，而种植香根草的湿地生长指标最低，去除率也最低。地上生物量和总生物量与氨氮去除显著相关，地下生物量与溶解性活性磷去除显著相关。在这些植物中，光合速率与氮去除的相关性较高。根系活力和根系生物量增量与五日生化需氧量去除的相关性更强。化学需氧量去除与植物生长指标的相关性较低。所有四种植物在夏季和秋季的去除率都较高。结果表明，植物生长对人工湿地中污染物去除的影响因植物种类和污染物的不同而存在差异。
