利用大型围隔研究沉水植被对水体富营养化的影响
EXPERIMENTAL STUDIES ON THE EFFECTS OF SUBMERSED MACROPHYTES ON THE EUTROPHICATION OF LAKE WATER USING LARGE-SIZED ENCLOSURES
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摘要: 在严重富营养化的东湖设置大型围隔(20×29m)两个,并在其中引种沉水植物-菹草(Potamogeton crispus L.),探讨了菹草的恢复对水体富营养化的影响。菹草的恢复,使两个大型围隔中的各种营养盐水平都显著地低于围隔外围的湖水(P0.6),对水体浮游植物叶绿素a浓度也没有显著影响。即在短期(一个月左右)未使水质明显恶化。
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关键词:
- 大型围隔试验 /
- 菹草的去除和重建 /
- 水生植物对湖水的影响
Abstract: Two large-sized enclosures (each 20 ?29m) were set up in the Shuiguo Hu Bay near the west end of the hypereutrophic Lake Donghu. At the beginning of the experiment (October 1995),no macrophytes were present in the enclosures and a submersed macrophyte, Potamogeton crispus, was introduced into both enclosures. In April 1996, P. crispus became very abundant in both enclosures (The maximum 214-381gD. W / m2). Compared with lake water outside the enclosures, the reestablishment of P. crispus significantly decreased the concentrations of various nitrogen and phosphorus compounds and conduchvity, and increased significantly dissolved oxygen and transparency of the water in the enclosures (p0.001). In April 7, P. crispus were removed from Encl. B. One month later, the concentrations of nutrients and chlorophyll a were only slightly higher in Encl. B than in Encl. A, and there was no statistically significant difference between them, i.e., the removal of P. crispus did not cause a significant deterioration of water quality within such a short period of time. -
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