Response of submerged macrophytes in Danish lakes to nutrient loading reductions and biomanipulation
Response of submerged macrophytes in Danish lakes to nutrient loading reductions and biomanipulation
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DOI：
10.1023/b:hydr.0000008633.17385.70
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发表时间：
2003-11
期刊：
影响因子：
2.6
通讯作者：
T. Lauridsen;Jens Peder Jensen;E. Jeppesen;M. Søndergaard
中科院分区：
文献类型：
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作者：
T. Lauridsen;Jens Peder Jensen;E. Jeppesen;M. Søndergaard
在过去的二十年中，丹麦湖泊的营养负荷已经减少，目的是改善水质。然而，由于内部P负载和生物抗性，预期的改善被延迟。因此，为了减少恢复期的持续时间和加速沉水植物的分解，几个湖泊已经进行了生物操纵，目的是提高浮游动物自上而下的控制。为了阐明这些措施的效果，我们进行了沉水植物的数据分析，每年在17个湖泊监测8年。结果表明，在非生物操纵湖泊的大型植物覆盖度保持相对稳定的外部营养盐减少。然而，一些湖泊的水生植物覆盖率略有增加。相比之下，在四个biomanipulated湖泊中的两个，大型植物覆盖率从0增加到80%，在2-4年内操作。在其他两个湖泊大型植物殖民失败。然而，在湖泊中，一个成功的tagonisation，大型的年际变化的大型水生植物覆盖率，在2和80%之间的生长季节，发生。我们的结论是，营养负荷减少后，在短期内的潜在的水生植物pecionisation是更高的biomanipulated湖泊比在湖泊负荷减少只，虽然biomanipulation不提供担保的水生植物pecionisation或一个稳定的水生植物群落时，发生殖民化。
During the last two decades the nutrient loading to Danish lakes has been reduced with the aim to improve water quality. However, because of internal P-loading and biological resistance, the expected improvement has been delayed. Therefore, to reduce the duration of the recovery period and to accelerate recolonisation of submerged macrophytes, several lakes have been biomanipulated with the purpose of improving the top-down control by zooplankton. To elucidate the effects of these measures, we undertook an analysis of data on submerged macrophytes monitored annually in 17 lakes for 8 years. The results obtained show that the macrophyte coverage in non-biomanipulated lakes remained relatively stable following the external nutrient reduction. However, a small increase in macrophyte coverage occurred in a few lakes. In two of the four biomanipulated lakes, in contrast, macrophyte coverage increased from 0 up to 80% within 2–4 years following manipulation. In the other two lakes macrophyte colonisation failed. However, in lakes with a successful recolonisation, large inter-annual variations in macrophyte coverage, varying between 2 and 80% among growth seasons, occurred. We conclude that the potential of macrophyte recolonisation after nutrient loading reduction on the short term is higher in biomanipulated lakes than in lakes subjected to loading reduction only, although biomanipulation does not provide a guarantee for macrophyte recolonisation or a stable macrophyte community when colonisation occurs.