湖水含盐量和Cu^(2+)浓度变化对Kinneret湖浮游植物的影响

THE EFFECTS OF SALINITY AND Cu ^(2+)CONCENTRATION ON THE PHYTOPLANKTON IN LAKE KINNERET

通过人为改变湖水中的Cu2 + 浓度和含盐量的方法 ,Cu2 + 浓度和含盐量变化对Kinneret湖水中浮游植物可能造成的影响进行了分析。结果表明 ,湖水Cu2 + 浓度增加会抑制Kinneret湖水中藻类等浮游植物的生长 ,这对改善湖水水质来说是非常有利的 ,但高的Cu2 + 浓度对农作物生长和人类健康是有害的。在另一方面 ,对含盐量较低的约旦河水来说 ,适当增加Cu2 + 浓度则有利于藻类的生长。Kinneret湖中浮游植物的年平均生物量随湖水含盐量的下降而有增加的趋势 ,特别是当含盐量低于 2 0 0 μg/L左右时 ,浮游植物中蓝藻占的比例会升高 ,这对作为饮用水资原的Kinneret湖水来说是不利的。由此可见 ,适当控制和维持Kinneret湖水Cu2 + 浓度和含盐量对湖水水质保护具有重要的意义。

This paper dealt with the influence of salinity and Cu 2+concentration on the phytoplankton by inducing artificially the changes of salinity and Cu 2+concentration of lake water. By means of experimental analysis, it found that increasing the Cu 2+ concentration of lake water inhibited the algal growth, it was good for improving water quality; however, high Cu 2+concentration was harmful to human health and crop growth. On other hand, as the salinity was low in Jordan river, increasing appropriately the Cu 2+concentration enhanced algal growth rate in river water. The annual mean biomass of phytoplankton have showed progressively increase with salinity decreasing successively. Especially, when the salinity of lake water was low than 200μg/L, the ratio of Blue-green algae/phytoplankton caused a shift, it was harmful to water quality in Lake Kinneret. It indicate that controlling Cu 2+concentration and keeping salinity is very important for the preservation of water quality in Lake Kinneret.