Effects of Exposed Artificial Substrate on the Competition between Phytoplankton and Benthic Algae: Implications for Shallow Lake Restoration
Effects of Exposed Artificial Substrate on the Competition between Phytoplankton and Benthic Algae: Implications for Shallow Lake Restoration
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暴露的人工基质对浮游植物和底栖藻类之间竞争的影响：对浅湖恢复的启示
DOI：
10.3390/w9010024
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发表时间：
2017-01
期刊：
影响因子：
3.4
通讯作者：
Li Kuanyi
中科院分区：
文献类型：
--
作者：
He Hu;Luo Xuguang;Jin Hui;Gu Jiao;Jeppesen Erik;Liu Zhengwen;Li Kuanyi
浅水湖泊中浮游植物和底栖藻类共存，这两种光自养生物的竞争结果会显著影响水体的清晰度。众所周知，在富营养化水域中，裸露的人工基质可以通过附着的附生植物树冠从水柱中去除营养物质和细颗粒物。然而，人工底物的引入对浮游初级生产者和底栖初级生产者之间竞争的影响仍有待阐明。我们进行了一个短期的室外中游实验，以验证暴露的人工底物(聚乙烯网)引起的营养和光照变化将有利于底栖藻类的假设。人工基质显著降低了总氮和磷的浓度，提高了水的透明度，后者是由于基质诱导有机和无机悬浮固体的减少。因此，从水体和沉积物中叶绿素a(Chl-a)浓度的变化来看，暴露的人工底物显著降低了浮游植物的生物量，而底栖藻类的生物量增加了。因此，我们的结果表明，暴露的人工底物可以作为一种工具，在外部营养负荷减少后，重建富营养化浅水湖泊的底栖生物初级生产力，为底栖或大型植物主导的系统铺平道路。然而，在对此得出任何确定的结论之前，还需要进行更长期和更大规模的实验。
Phytoplankton and benthic algae coexist in shallow lakes and the outcome of the competition between these two photoautotrophs can markedly influence water clarity. It is well established that exposed artificial substrate in eutrophic waters can remove nutrients and fine particles from the water column via the attached periphyton canopy. However, the effects of the introduction of artificial substrate on the competition between planktonic and benthic primary producers remain to be elucidated. We conducted a short-term outdoor mesocosm experiment to test the hypothesis that the nutrient and light changes induced by exposed artificial substrate (polythene nets) would benefit the benthic algae. Artificial substrate significantly reduced total nitrogen and phosphorus concentrations and water clarity improved, the latter due to the substrate-induced reduction of both organic and inorganic suspended solids. Consequently, as judged from changes in chlorophyll a (Chl-a) concentrations in water and sediment, respectively, exposed artificial substrate significantly reduced the phytoplankton biomass, while benthic algae biomass increased. Our results thus indicate that exposed artificial substrate may be used as a tool to re-establish benthic primary production in eutrophic shallow lakes after an external nutrient loading reduction, paving the way for a benthic- or a macrophyte-dominated system. Longer term and larger scale experiments are, however, needed before any firm conclusions can be drawn on this.
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