水生植物千屈菜夏季生理变化及其脱氮除磷实验研究

Study on the physiological traits of lythrum salicaria and both nitrogen and phosphorus removal from micro-polluted water bodies in summer

研究了千屈菜在夏季微污染水体中的生理特性日变化规律和脱氮除磷净水效果。在三种不同栽植密度的净水槽中,分别考察了千屈菜根系POD活性、根系活力、Chla和Chlb含量以及水体中NH_4^+-N、TP和CODcr污染物浓度等指标,分析了植物生理特性日变化规律及其与脱氮除磷性能和栽植密度之间的关系。结果表明:根系POD活性、根系活力、Chla和Chlb含量与NH_4^+-N和TP及COD_(Cr)去除量呈正相关;植物栽植密度越大,其根系POD活性、Chla和Chlb含量越低;单棵植物对微污染水体中NH_4^+-N、TP和COD_(Cr)的吸附量最大的是栽植密度为3棵的净水槽。

The diurnal variation of the physiological status of lythrum salicaria was investigated in this paper,and both nitrogen and phosphorus removals from micro-polluted water bodies in summer were experimented.Lythrum salicaria was cultivated with three various densities in three tanks,and the diurnal variation of POD,root activity,and Chla and Chlb contents of the leaves were investigated.The COD,NH_4~＋-N and TP accumulation of the plants were measured as well.In addition,we analyzed the diurnal variation of the physiological status of the plant,its relations to the NH_4~＋-N,TP and CODc_r removals from micro-polluted water bodies,and the effects of planting density.Results showed that POD,activity of the roots,and Chla and Chlb of the leaves have positive correlations with NH_4~＋-N and TP and CODc_r removals from the micro-polluted water bodies.In the tanks with higher planting densities,the plants have lower POD activities and Chla and Chlb.In the tank with 3 plants,the single lythrum salicaria adsorption of NH_4~＋-N,TP and CODc_r has the highest value.