浮床栽培柳树在富营养化水体中的生长特性及水质净化效果研究

Study on the growth characteristic of willow(Salix babylonica Linn) planted on floating bed and its purification efficiency in eutrophicated water body

以浮床水培柳树(Salix babylonicaLinn)为对象,研究其在富营养化水体中2 a积累的生物量、株高与生物量关系以及植物体对N、P的吸收情况.结果显示,柳树从种子到幼苗的过程中所积累的生物量鲜重平均为789 g/株.2 a内,在种植密度为12.5株/m2的浮床上,每平方米柳树浮床能将34.2 m3的水从Ⅴ类水净化为Ⅲ类水质(以TP计).柳树对富营养化水体的修复进程相对缓慢,但易于管理,适宜于水体的长期净化.

The study was conducted on willow （Salix babylonica Linn. ） planted on the floating bed in terms of biomass, relation between biomass and height, and the removing efficiency of N and P from the eutrophicated water body. Results showed that the average accumulative biomass of willow planted on the floating bed from seed to young tree within two years was of 789 g/individule when they were planted with a density of 12. 5 ind./m^2. Within two years, averagely each square meter of willow floating bed was able to purify 34. 2 ma from grade Ⅴ to grade Ⅲ in Chinese water quality classification system. The willow cleaned the water slowly but easy for management. It was suitable for purifying the eutrophicated water body for a long run.