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首页> 外文期刊>Hydrobiologia >Seasonal water chemistry and diatom changes in six boreal lakes of the Laurentian Mountains (Qucbbec, Canada): impacts of climate and timber harvesting
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Seasonal water chemistry and diatom changes in six boreal lakes of the Laurentian Mountains (Qucbbec, Canada): impacts of climate and timber harvesting

机译：Laurentian山（加拿大Qucbbec）的六个北方湖泊中的季节性水化学和硅藻变化：气候和木材采伐的影响

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摘要

The physical and chemical variabilities as well as the distribution of diatoms of six boreal lakes in the Laurentian Mountains (southern Qucbbec, Canada) were studied. The lakes are located along an altitudinal gradient and were sampled at a biweekly resolution from May through October, 2002. In general, we found later onset and weaker lake stratification under colder climates. Lake circulation and SiO are strongly correlated and together significantly explain the distribution of diatoms of the individual lakes. Diatoms that accumulated in the sediment traps were mostly composed of benthic species, suggesting resuspension. However, diatom flux and lake circulation were not significantly correlated, the diatom assemblages in the sediment traps were similar in two consecutive years, and species-environment relationships were comparable among lakes, which indicates that the effects of resuspension were minimal. In addition, we found that one lake was more productive due to forest logging. The forest in the catchment of Lake Maxi was entirely clear-cut shortly prior to our sampling. Mean total phosphorus, dissolved organic carbon, and chlorophyll a concentrations were significantly higher when compared to the other five study lakes. This study seeks to improve our understanding of how diatoms in boreal lakes respond to climate change and forest clear-cut.
机译：研究了Laurentian山（加拿大魁北克省南部）的六个北方湖泊的物理和化学变异性以及硅藻的分布。这些湖泊沿海拔梯度分布，并从2002年5月至2002年10月每两周进行一次采样。总体而言，我们发现较晚的发作和较冷气候下的湖泊分层较弱。湖泊环流和SiO密切相关，一起可以很好地解释各个湖泊的硅藻分布。沉积在沉积物中的硅藻主要由底栖生物组成，这表明它们已经重新悬浮。然而，硅藻通量与湖泊环流没有显着相关性，沉积物陷阱中的硅藻组合在连续两年中相似，并且湖泊之间的物种-环境关系相当，这表明重悬浮的影响很小。此外，我们发现由于森林砍伐，一个湖泊的生产力更高。在我们取样之前不久，马克西湖集水区的森林被完全砍伐。与其他五个研究湖泊相比，平均总磷，溶解有机碳和叶绿素a浓度显着更高。这项研究旨在增进我们对北方湖泊中的硅藻如何应对气候变化和森林砍伐的理解。

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