Phragmites australis and Typha orientalis in removal of pollutant in Taihu Lake, China
Two plant populations of Phragmites australis and Typha orientalis grown in gravel and sediment substrate were studied to assess their capabilities for purifying polluted water in Taihu Lake,China.The substrate displayed most significant effects on the suspended matter (P ＜0.01),with the reduction of 76％-87％ and 52％-63％ for P.australis,and 83％-86％and 45％-62％ for T.orientalis in gravel substrate and sediment substrate,respectively.Both species and substrates most significantly decreased the N and P concentrations of water body (P ＜ 0.01 ).P.australis showed higher total N and P concentrations in tissues than T.orientalis and had greater potential to remove nutrients of the lake.Phosphate was easily to concentrate in the belowground tissues,while nitrate concentration was higher in leaf and stalk.So harvesting the aboveground tissues could take most of nitrate out of thesediment.The saturate photosynthetic rate (Asat) of P.australis was higher than that of T.orientalis when grown in sediment substrate.But instance water use efficiency (WUEi) and intrinsic water use efficiency (A/gs) showed the maximum values of two species grown in river water.With significant difference in gs,however,Cihad no obvious difference in two species which indicated that high value of Asat,of P.australis might result from the increased carboxylation capacity of the mesophyll because of the central role of N in photosynthetic enzymes.Our findings suggest that the plants could absorb most of nitrogen in polluted water,while gravel displayed high capacity for absorbing the suspended matters and phosphate salts.Therefore,biological and physiological pathways for pollutant removal should be integrated.
Phragmites australis Typha orientalis nutrient removal gas exchange Taihu Lake
Tian Ziqiang Zheng binghui Liu meizhen Zhang zhenyu
River and Coastal Environment Research Center,Chinese Research Academy of Environmental Sciences, Be State Key Laboratory of Vegetation Environmental Change, Institute of Botany, the Chinese Academy of Department of Water Environmental Planning, Chinese Academy For Environme
国内会议
武汉
英文
807-814
2009-11-01（万方平台首次上网日期，不代表论文的发表时间）