Hypolimnetic oxygen depletion in eutrophic lakes.
Hypolimnetic oxygen depletion in eutrophic lakes.
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DOI：
10.1021/es301422r
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发表时间：
2012-08
影响因子：
11.4
通讯作者：
B. Müller;L. Bryant;A. Matzinger;A. Wüest
中科院分区：
文献类型：
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作者：
B. Müller;L. Bryant;A. Matzinger;A. Wüest
淡水湖的浅水中导致深水缺氧的耗氧过程仍然没有得到很好的理解，从而限制了适当的管理概念。本研究提供了从11个富营养化湖泊获得的数据，并提出了一个模型，描述了溶解氧（O（2））的消耗在富营养化湖泊的hypolimnia的结果只有两个基本过程：O（2）消耗（i）沉积物表面的沉积有机物质和（ii）从沉积物中扩散的还原物质。除了湖泊的生产力外，其底栖O（2）消耗量取决于沉积物上覆水中的O（2）浓度和分子O（2）向沉积物的扩散。根据11个富营养化湖泊长期监测数据的观测证据，我们发现，区域潜水矿化率为0.47 - 1.31 g O（2）m（-2）d（-1），（平均0.90 ± 0.30）是（i）还原物质的底栖通量（0.37 ± 0.12 g O（2）m（-2）d（-1））和（ii）O（2）消耗量随平均下层厚度（z（H））线性增加，直到~25 m。该模型对于预测和解释湖泊和水库对恢复措施的响应具有重要意义。
The oxygen-consuming processes in the hypolimnia of freshwater lakes leading to deep-water anoxia are still not well understood, thereby constraining suitable management concepts. This study presents data obtained from 11 eutrophic lakes and suggests a model describing the consumption of dissolved oxygen (O(2)) in the hypolimnia of eutrophic lakes as a result of only two fundamental processes: O(2) is consumed (i) by settled organic material at the sediment surface and (ii) by reduced substances diffusing from the sediment. Apart from a lake's productivity, its benthic O(2) consumption depends on the O(2) concentration in the water overlying the sediment and the molecular O(2) diffusion to the sediment. On the basis of observational evidence of long-term monitoring data from 11 eutrophic lakes, we found that the areal hypolimnetic mineralization rate ranging from 0.47 to 1.31 g of O(2) m(-2) d(-1) (average 0.90 ± 0.30) is a function of (i) a benthic flux of reduced substances (0.37 ± 0.12 g of O(2) m(-2) d(-1)) and (ii) an O(2) consumption which linearly increases with the mean hypolimnion thickness (z(H)) up to ~25 m. This model has important implications for predicting and interpreting the response of lakes and reservoirs to restoration measures.