Evaluating the extent of CO₂ emissions from lakes exhibiting diverse trophic levels is essential for advancing our current understanding of the influence of ecological and climatic processes on these ecosystems. This research consisted in measuring CO₂ emission during the day hours from lakes located in the Suwałki Lake District and was carried out in the littoral zone using a closed floating chamber. Based on the trophic indexes, oligotrophic, mesotrophic, eutrophic, and dystrophic lakes were distinguished. The emission from all investigated lakes ranged from −0.354 g (CO₂) per m h⁻¹ to 0.142 g (CO₂) per m h⁻¹. This research confirms that lakes could be absorbers or emitters of CO₂ to the atmosphere. Only the Arkadia reservoir was in a state close to equilibrium in the water–air phase system. Most of the lakes were oversaturated with CO₂ resulting in its release to the atmosphere. Their CO₂ excess is widely attributed to in-lake oxidation of terrestrially organic matter. The humic lake despite lower production at the level of about 80 mgC m⁻² d⁻¹ compared to the other lakes (net production > 100) showed a negative CO₂ gradient in the water-to-air system, which resulted in the absorption of CO₂ from the atmosphere. Both natural and anthropogenic factors are crucial in controlling the rate at which CO₂ is released into the atmosphere. An emphasis should be placed on controlling external loadings of organic matter, where decomposition could release CO₂ to the water column and oversaturation results in higher CO₂ emissions to the atmosphere. Engaging in such research has the potential to aid in the formulation of water conservation management strategies. These investigations can further contribute to the development of lake conservation strategies that specifically address the mitigation of CO₂ emissions from these aquatic ecosystems into the atmosphere.

中文翻译：

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波兰东北部不同营养级湖泊沿岸夏季二氧化碳排放量估算

_{评估具有不同营养水平的湖泊的CO 2}排放程度对于加深我们目前对生态和气候过程对这些生态系统影响的理解至关重要。这项研究包括测量苏瓦乌基湖区湖泊白天的 CO ₂排放量，并使用封闭的浮室在沿海地区进行。根据营养指数可分为贫营养型、中营养型、富营养型和营养不良型湖泊。所有调查湖泊的排放量范围为-0.354 g (CO ₂ )/mh ^-1至0.142 g (CO ₂ )/mh ^-1。这项研究证实湖泊可以吸收或排放CO ₂到大气中。只有阿卡迪亚水库的水-气相系统处于接近平衡的状态。大多数湖泊CO ₂过饱和，导致其释放到大气中。它们的CO ₂过量被广泛归因于陆地有机物的湖内氧化。尽管与其他湖泊（净产量> 100）相比，腐殖质湖的产量较低，约为 80 mgC m ^-2 d ^-1，但在水-空气系统中显示出负 CO ₂梯度，这导致了吸收来自大气的CO _{2 。自然和人为因素对于控制CO 2}释放到大气中的速率至关重要。应重点控制有机物的外部负荷，其中分解可能将CO ₂释放到水柱中，而过饱和会导致向大气中排放更多的CO _{2 。}参与此类研究有可能有助于制定节水管理策略。这些调查可以进一步促进湖泊保护战略的制定，专门解决减少这些水生生态系统向大气中排放的CO _{2的问题。}