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首页> 外文期刊>Aquatic Sciences >Macrophyte performance in a low arctic lake: effects of temperature, light and nutrients on growth and depth distribution
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Macrophyte performance in a low arctic lake: effects of temperature, light and nutrients on growth and depth distribution

机译：低北极湖泊中大型植物的表现：温度，光和养分对生长和深度分布的影响

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Submerged macrophytes are important contributors to primary production in clear water arctic and low arctic lakes. However, their production and potential coverage are hampered by the harsh climate conditions. In this study, we investigated the potential for increased macrophyte production and coverage in arctic lakes in a future warmer climate. In situ growth experiments with Callitriche hamulata were performed at 2, 4, 8 and 12 m depth in combination with nutrient assay experiments at 2 m depth. In addition, growth experiments were performed in the laboratory at four temperatures (5, 10, 15 and 20 degrees C) under saturated and light-limited conditions (150 and 25 mu mol m(-2) s(-1)). The results show that macrophyte growth in the low arctic lake, Badeso, is phosphorus limited, but they also indicate that nutrients are not the limiting factor for the macrophyte depth distribution. Rather the short growing season combined with low summer temperatures may limit the expansion of C. hamulata. Our study also shows that C. hamulata is a very temperature-sensitive plant, particularly around 10 degrees C. In a future warmer climate in the arctic, the thermocline in clear lakes is expected to expand deeper into the water column. Thus, at the present light conditions we can expect an expansion of both colonisation depth and coverage, which may affect the overall primary production in arctic lakes and the carbon flux and carbon cycling in the lake systems. Our findings strongly support recent predictions of increased growth and a more northerly distribution range of cold-temperature submerged macrophytes.
机译：沉没的大型植物是清水北极和低北极湖泊初级生产的重要贡献者。但是，恶劣的气候条件阻碍了它们的生产和潜在的覆盖范围。在这项研究中，我们调查了在未来温暖的气候下北极湖泊中大型植物的生产和覆盖范围增加的潜力。结合2,2、4、8和12 m深度进行ha游Callitriche hamulata的原位生长实验，并与2 m深度的营养分析实验相结合。此外，在实验室中在四个温度（5、10、15和20摄氏度）下，在饱和和受光限制的条件下（150和25μmol m（-2）s（-1））进行生长实验。结果表明，低北极湖Badeso的大型植物生长受磷限制，但也表明养分并不是大型植物深度分布的限制因素。相反，生长季节短加上夏季气温低可能限制了C. hamulata的扩张。我们的研究还表明，ha鱼C. hamulata是一种对温度非常敏感的植物，尤其是在10摄氏度左右。在未来北极气候变暖的情况下，预计清澈湖泊中的温床将更深地扩展到水柱中。因此，在目前的光照条件下，我们可以预期到定植深度和覆盖范围的扩大，这可能会影响北极湖泊的总体初级生产以及湖泊系统中的碳通量和碳循环。我们的发现有力地支持了最近的预测，即对低温淹没大型植物的增长和北向分布范围的增加的预测。

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