铝盐净水效果及对沉水植物苦草生长的影响

The Effect of Aluminum on Water Purification and the Growth of Submerged Macrophyte Vallisneria natans

采用室外模拟方法,研究了不同浓度铝盐(明矾)净水效果及对沉水植物苦草(Vallisneria natans)生长的影响。设置了3个不同铝盐浓度处理组:对照组(无添加)、一次加铝组(15mg/L)和三次加铝组(45mg/L)。结果表明:(1)一次加铝组叶绿素a、反应活性磷、pH、碱度较试验开始时均有下降,且三次加铝组显著低于一次加铝组;(2)三次加铝组中水体总氮浓度最高;(3)三次加铝组苦草的相对生长率显著低于对照组。本研究说明铝盐的使用能在短期内降低水体污染,高剂量使用虽能抑制浮游植物的生长,但同时也会对苦草的生长产生抑制作用,且使水体水质恶化。

With the method of outdoor simulation,this paper studies the effect of different concentration of aluminum salt on water purification and growth of Vallisneria natans.We set up three treatment groups of different concentration aluminum salt.There are control group（no addition）,one addition group（15 mg/L） and three additions（45 mg/L）.The results shows that：（1） The chlorophyll-a,SRP,pH,and alkalinity that in the water with one addition group decrease at the beginning of the test,and are significantly lower in the three additions group;（2） The total nitrogen is the highest in the three additions group;（3） The biomass of V.natans in the three additions group is lower than that in the control group and one addition group.The study indicates that the use of aluminum salt can reduce the water pollution,and high dose of Al inhibits the growth of phytoplankton,but also reduces the growth of Vallisneria natans and deteriorates the water quality.