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首页> 外文期刊>Aquatic Sciences >Interactions between environmental factors and vertical extension of helophyte zones in lakes in Finland
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Interactions between environmental factors and vertical extension of helophyte zones in lakes in Finland

机译：芬兰湖泊中环境因子与垂直植物区系垂直扩展之间的相互作用

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Sheltered shores in boreal lakes are typically dominated by emergent helophytes in which the perennating organ lies in soil below the water level, but the aerial shoots protrude above the water. Changes in natural water-level regimes due to hydropower development may significantly affect the longitudinal extent of the helophyte zone. We explored the vertical distribution of helophyte zones under water-level regulation to develop tools for estimating hydropower impacts. We recorded the vertical extension of the three most common helophyte species (Carex L. spp., Equisetum fluviatile L., and Phragmites australis (Cav.) Trin. ex Steud.) along 238 macrophyte transects in four regulated lakes and one nonregulated lake in Finland. We used random forest (RF) models to quantify the degree to which water-level fluctuation and site-specific environmental variables uniquely explained the variation in helophyte zonation. The vertical extension of Carex spp. was most strongly associated with the water-level fluctuation of the open-water period (OWP), followed by Phragmites and Equisetum. Overall, the RF models explained 4-41% of the variation observed in the helophyte zones. The models indicated that OWP fluctuation, slope, openness, and cover of other macrophyte groups were key factors explaining the extent of the helophyte zones. OWP fluctuation was the most important variable for zonation of Carex spp. and the upper limit of Phragmites. Slope was the most significant variable for the lower limit of Equisetum and Phragmites. Our study demonstrates the importance of taking into account natural habitat-level variability to increase confidence in quantifying the environmental impacts of hydropower production. This approach could be used in future impact assessments of new water-level regulation practices.
机译：北方湖泊的庇护海岸通常以出没的杂植物为主，其中的长生器官位于水位以下的土壤中，而空中芽突出水面以上。由于水力发电的发展，自然水位状况的变化可能会严重影响植物群落带的纵向范围。我们探索了在水位调节下的植物群落垂直分布，以开发估算水电影响的工具。我们记录了三个最常见的植物种类（Carex L. spp。，Equisetum fluviatile L.和Phragmites australis（Cav。）Trin。ex Steud。）在四个受管制的湖泊和一个非受管制的湖泊的238个大型植物样带的垂直延伸。芬兰。我们使用随机森林（RF）模型来量化水位波动和特定地点的环境变量唯一地解释了植物群落分区变化的程度。 Carex spp的垂直延伸。与开放水期（OWP）的水位波动最密切相关，其次是芦苇和木贼。总体而言，RF模型解释了在原生植物区观察到的变化的4-41％。该模型表明，OWP波动，坡度，开放度和其他大型植物群的覆盖度是解释植物群落带范围的关键因素。 OWP波动是Carex spp分区最重要的变量。和芦苇的上限。对于木贼和芦苇的下限，坡度是最大的变量。我们的研究表明，考虑到自然生境水平的可变性以增加对水电生产对环境的影响进行量化的信心的重要性。该方法可用于未来对新水位监管措施的影响评估。

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