以生物操縱法進行小型人造水池優養化控制之研究

Abstract

水體呈現優養化時，繁殖過盛的藻類是最顯著的表徵也是困擾著水源使用者的主要問題之一。本研究欲利用生物操縱的作法，在一人造景觀水池中置放數組由塑膠網材製成的浮游動物人造庇護所，提供浮游動物躲避其天敵捕食的安全棲息處並增加池內的空間多樣性，希望能提高水中浮游動物族群量，進而攝食控制水中藻類的數量。研究結果顯示，人造庇護所內浮游動物群落之多樣性增高，尤其出現大量的輪蟲及原生動物，但其效果無法擴及庇護所範圍外的開放水域，且在大型浮游動物族群量仍舊偏低的狀況下，水池中的藻類濃度並沒有因為庇護所的設置而降低。

The high concentration of algae in water body is the most significant symptom of eutrophication and often perplexes the users of the water. With the approach of biomanipulation, we built several artificial refuges made of plastic net for zooplankton in an artificial pond. We wanted to reduce the quantity of algae in the water by the enhanced consumption of zooplankton due to their increased population. These refuges could offer safe habitats for zooplankton to hide and increase the space heterogeneity in the pond. The results of our research indicate that the species diversity of zooplankton in the refuges has increased due to the appearance of rotifers and protozoa. But the amount of zooplankton was still low in open water outside the refuges. Without large body-sized zooplankton in the water in this case, the concentration of algae in the pond remained high after the installation of the refuges.