摘要
微生物是人工湿地中净化污水最主要的因素之一。已有研究结果表明,植物根际微生物群落在有机污染物和氨氮等物质的降解过程中均发挥了重要的作用。本研究的目的是通过建立小型实验湿地系统,考察在不同植物组合条件下人工湿地系统的污染物去除效率与植物根际微生物群落功能多样性的相互关系。研究结果显示,旱伞草、美人蕉和芦苇组合系统的TN、TP和BOD5去除效率最高,而旱伞草和美人蕉组合系统的CODCr净化效率最高。旱伞草、美人蕉、芦苇3种植物组合系统和旱伞草和美人蕉两种植物组合系统根际微生物群落功能多样性较高,利用碳源的能力较强;而单一旱伞草植物系统根际微生物群落功能多样性较小,利用碳源能力较差。实验结果表明,通过不同植物组合而成的湿地系统,可提高根际微生物群落功能多样性,从而提高人工湿地污染物净化的效率和稳定性。
Microorganism is one of the main factors affecting wastewater purification in constructed wetland. Current studies have showed that rhizosphere microorganism communities play an important role in degradation of organic pollutants and ammonia nitrogen. The purpose of this study was to investigate the relationship between wastewater purification and rhizosphere microorganism communities at the conditions of different plants combinations through a lab scale constructed wetland. Results showed that the purification efficiency in the combined plant systems was higher and more stable than that of single plant, i.e., the highest purification efficiencies of TN, TP and BOD5 in the mixture of Phragmites, Canna indica and Cyperus alternifolius, and the highest purification efficiency of CODCr in the mixture of Canna indica and Cypenus ahernifolius. In addition, the diversity and carbon source utilization of microorganism community in different plant systems were showed as following in turn：the highest was the mixture of Canna indica and Cyperus alternifolius, then the higher was the mixture of Phragmites, Canna indica and Cyperus alternifolius, and the lowest was that the single plant, Cyperus ~ternifolius. Therefore, it can be concluded that the combined plant system in the constructed wetland can increase the efficiency and its stability of wastewater treatment by promoting the variety of rhizosphere microorganism communities.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第6期2401-2406,共6页
Journal of Agro-Environment Science
基金
中国科学院生态中心科技创新资助项目
关键词
人工湿地
植物组合系统
根际微生物群落
多样性
constructed wetland
combined plant system
rhizosphere microorganism community
diversity
