<正>研究了水葫芦在改良水质中的作用。经过水质测定表明，当平均照度 １３７９Ｌｘ、平均水温１５ ℃时，测得每公斤水葫芦可以从水体中吸收ＰＯ４３－－Ｐ ５．０ ｍｇ／ｄ，吸收ＮＯ２－Ｎ和ＮＨ４＋－ Ｎ ４７． ９ ｍｇ／ｄ；并且在 １５天内消除水体中的 ＮＯ２－－ Ｎ。水葫芦不仅是一种优良的水生植物性饲料、绿肥，而且能有效地改良水质，降低水体污染。

This paper studied the effects of water hyacinth in improving the water quality. Based on the analysis of the comparison of the water quality determination, this paper shows that under the average water temperature of 15 ℃ and average illuminate of 1 379 Lx, 1 kg water hyacinth absorbs PＯ４３－- P 5. 0 mg/d and NO2 - N and NH4+ - N 47. 9 mg/d in average. In 15 days water hyacinth eliminates the NO2- - N from the water in the pond. These indicate that the water hyacinth is very effective in the improvement of the water quality and the reduction of the water pollution.