水翁(Cleistocalyx operculatus)在人工湿地的生长特性及对污染物的去除效果

研究了水翁在人工湿地的生长特性及其对污水的净化效果.结果表明:生长在人工湿地的水翁具有发达的侧根系,能保持正常的净光合速率((19.2±2.1)μmol/(m2·s))、蒸腾速率((23.5±2.3)mmol/(m2·s))、气孔传导率((657.5±53)mmol/(m2·s))、根系活力((20.9±3.2)μg/(g·min))和生长速率((9.9±0.5)mg/(g·d)).水翁人工湿地对TN,TP,C0D_cr和BOD₅的去除率分别为55.6%,44.2%,75.7%和73.2%.其中水翁对N,P的吸收量分别占人工湿地对N,P去除量的16.4%和12.6%.水翁为常绿乔木,可考虑与灌木和草本植物结合起来,建立乔、灌、草自然湿地系统,达到改善水质的目的. 

Growth Characteristics and Pollutant Removal Effect of Cleistocalyx Operculatus in Constructed Wetland

The growth characteristics and pollutant removal effect of Cleistocalyx operculatus in the constructed wetland were studied. The experiments showed: C.operculatus in the constructed wetland possessed a large amount of lateral roots, and they maintained a normal rate of net photosynthesis ((19.2±2.1)μmol/(m·s)), with a transpiration rate of (23.5±2.3)mmol/(m·s), a stomatal conductance of (657.5±53)mmol/(m·s), a vigor of (20.9±3.2)μg/(g·min) in the root system and a relative growth rate of (9.9±0.5)mg/(g·d). The removal rates of TN, TP, CODCr and BOD5 from the sewage in the constructed C.operculatus wetland were 55.6%, 44.2%, 75.7% and 73.2%, respectively. However, the amounts of uptake to N and P by plant only accounted for 16.4% and 12.6% of the amounts of removal from wastewater, respectively. C. operculatus, an evergreen tree, could be planted with shrub and herb to build natural wetland system and improve water quality.