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首页> 外文期刊>Aquatic ecosystem health & management >Increasing algal biomass in Lake Vaenern despite decreasing phosphorus concentrations: A lake-specific phenomenon?
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Increasing algal biomass in Lake Vaenern despite decreasing phosphorus concentrations: A lake-specific phenomenon?

机译：尽管磷浓度降低，但Vaenern湖中的藻类生物量仍在增加：这是湖泊特有的现象吗？

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摘要

Algal blooms in lake waters are frequently associated with elevated nutrient levels, in particular phosphorus. Here we show, with long-term data from Sweden's largest lake, Lake Vaenern, that total phytoplankton biomass has significantly increased since the 1980s at the same time as total phosphorus and inorganic nitrogen concentrations have significantly decreased (non-parametric Mann-Kendall test: P ＜ 0.01). Lake Vaenern was not the only lake showing such a pattern: evaluating long-term data from 13 small oligotrophic reference lakes revealed the same pattern. Other synchronous changes observed in Sweden's oligotrophic lakes included strongly decreasing sulfate concentrations and increasing water temperatures. We found that alkalinity, water temperatures, silica and sulfate concentrations were the strongest predictors for total phytoplankton biomass at all three sites in Lake Vaenern when we used partial least squares regression models with 11 input variables. From our results, we suggest that decreasing acidity in combination with increasing water temperatures has been more important for phytoplankton growth than total phosphorous and nitrogen concentrations. Thus, we conclude that phytoplankton biomass in oligotrophic small and large lakes is strongly associated with climate and atmospheric depositional changes, and consequently needs to be managed beyond catchment scales.
机译：湖水中的藻华经常与养分水平升高有关，尤其是磷。在这里，根据瑞典最大的湖泊Vaenern湖的长期数据显示，自1980年代以来，浮游植物总生物量显着增加，与此同时磷和无机氮的总浓度显着下降（非参数Mann-Kendall试验： P ＜0.01）。瓦恩湖不是唯一显示出这种模式的湖泊：评估13个小型营养贫乏参考湖泊的长期数据后发现了相同的模式。在瑞典的贫营养湖中观察到的其他同步变化包括硫酸盐浓度急剧下降和水温上升。我们发现当使用11个输入变量的偏最小二乘回归模型时，碱度，水温，二氧化硅和硫酸盐浓度是维纳恩湖所有三个地点浮游植物总生物量的最强预测因子。根据我们的结果，我们认为降低酸度和增加水温对浮游植物的生长比总磷和氮的浓度更为重要。因此，我们得出结论，贫营养型大小湖泊中的浮游植物生物量与气候和大气沉积变化密切相关，因此需要在集水区范围之外进行管理。

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