塘-湿地系统中芦苇对再生水氮磷吸收能力研究

Nitrogen and Phosphorus Absorption Capacity of Phragmites australis in Constructed Pond-Wetland System for Reclaimed Water Treatment

以天津市空港经济区塘-湿地组合处理系统为对象,研究了再生水补给条件下芦苇各组分氮（N）、磷（P）的吸收能力。研究发现：在一个生长周期内,芦苇不同组分（穗、叶、茎、根）N、P的质量分数为（1.17±0.82）%和（0.067±0.057）%,存在穗〉叶〉根〉茎的特点。芦苇各组分N、P的质量分数随生境类型而变化,其中N的质量分数范围介于0.22%~2.34%,P介于0.012%~0.23%。再生水补给条件下系统地上生物量为（119.37±62.25）kg/m2,明显高于周边河道自然生长的芦苇（（19.08±5.73）kg/m2）,表明再生水的补给能有效提高芦苇的初级生产力,且地上部分对N、P的累积能力高于地下部分,分别为4.10和5.20倍。

A typical area,Tianjin Airport Industrial Park with reclaimed water supplement for river system was selected as a case study to explore phosphorus and nitrogen absorptive capacity in different components of Phragmites australis in a constructed pond-wetland combination system during one growing season.Results showed that mass fractions for nitrogen and phosphorus in different tissues were（1.17±0.82）%,（0.067±0.057）% respectively,and it was the highest in panicles while the lowest in stems of Phragmites australis.Mass fraction of nitrogen and phosphorus varied significantly from habitats and ranged between 0.22% and 2.34%,while phosphorus ranged among 0.012% and 0.23%.Aboveground biomass（119.37±62.25） kg/m2 in constructed pond-wetland system was obviously higher than that in natural condition（19.08±5.73） kg/m2,and cumulative ability of Phragmites australis ground components to nitrogen and phosphorus was much higher（4.10 and 5.20 times respectively） than that of its underground components,which indicated the supply of reclaimed water might enhance the primary productivity of Phragmites australis.