【摘要】 选取面积为1 600 m2的小叶章(Deyeuxia angustifolia)湿地进行小区域模拟试验。试验设割草区、1倍浓度区、静态对照区和2倍浓度区4个处理,研究N、P输入浓度,割草和输出径流对三江平原小叶章湿地生态系统净化N、P污染物的影响。结果表明,在小叶章生长期和成熟期,湿地生态系统对N、P保持较稳定的净化,N、P平均去除率分别为85.62%和85.94%。湿地水体中TN和NH4+-N的累积浓度显著相关。输入浓度、割草和输出径流都影响着湿地生态系统对N、P的净化和N、P在系统内的分配。输入浓度增大时,N、P去除率明显降低;割草会降低N去除率,但对P去除率影响不大;少量输出径流对N、P去除影响不大。三江平原小叶章湿地生态系统对输入的N、P具有显著净化作用,总净化率可达97.97%和99.05%。更多还原

【Abstract】 An area（about 1 600 m²） of Deyeuxia angustifolia wetland in Sanjiang Plain was selected to study the function of wetland ecosystems purifying environmental N and P pollutants.Results show that the N and P removal rates presented a rather steady trend during the vegetation growth and maturation periods,and the average removal rate was 85.62% and（85.94）%,respectively.The accumulated concentration of NH⁺₄-N was significantly correlated with TN in the water body of the wetland.Input concentration,mowing and runoff all affected the purification function of the wetland and distribution of N and P.The removal rate decreased with the increase of input concentration and also with mowing.Limited runoff played little role in removing N and P.In a word,the purification efficiency of the Deyeuxia angustifolia wetland ecosystem in Sanjiang Plain was remarkable.The total removal rate of N and P reached 97.97% and 99.05%,respectively.更多还原