Why productive lakes are larger mercury sedimentary sinks than oligotrophic brown water lakes
Why productive lakes are larger mercury sedimentary sinks than oligotrophic brown water lakes
复制标题
为什么高产湖泊比贫营养褐水湖具有更大的汞沉积汇
DOI：
10.1002/lno.11684
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发表时间：
2020
影响因子：
4.5
通讯作者：
B-S. Biester
中科院分区：
文献类型：
--
作者：
Schütze;Gilfedder;B-S. Biester
由于汞在水生食物链中的生物放大作用，湖泊沉积物中的汞积累是一个普遍的环境问题。土壤汞浓度、流域植被、侵蚀和湖泊生产力是控制汞在湖泊中积累的主要因素。然而，它们对具有不同集水特征和营养状态的湖泊中汞质量平衡的影响知之甚少。在这个多湖的研究中，我们破译的影响，流域植被（针叶林与落叶林），土壤汞含量，和营养状态的汞沉积在六湖在德国。我们调查了树叶，土壤和湖泊的水相汞浓度。针叶林下土壤中汞浓度略高于落叶林下。贫营养的棕色水湖泊中，水相中的汞浓度较高（8.1 ± 5.6 ng L− 1 vs. 3.0± 1.9 ng L−1）。沉积物捕集器材料中汞浓度较低，表明中营养湖泊中藻类有机物的稀释作用（0.12-0.17μg g− 1 vs. 0.57-0.89μg g-1）。然而，中营养湖泊沉积物中的汞积累率（113-443μg m− 2 yr −1）比棕水湖泊（32-144μg m − 2 yr − 1）高14倍，这不能用流向生产性湖泊的较高汞通量来解释。汞质量平衡计算表明，藻类对水相汞的清除作用是富营养化湖泊沉积物中汞大量输出的主要原因，富营养化湖泊的沉积汇明显大于贫营养化的棕水湖泊。
Mercury accumulation in lake sediments is a widespread environmental problem due to the biomagnification of Hg in the aquatic food chain. Soil Hg concentrations, catchment vegetation, erosion, and lake productivity are major factors controlling the accumulation of Hg in lakes. However, their influence on the Hg mass balance in lakes with different catchment characteristics and trophic state is poorly understood. In this multilake study, we decipher the effects of catchment vegetation (coniferous vs. deciduous forest), soil Hg content, and trophic state on Hg sedimentation at six lakes in Germany. We investigated Hg concentrations in leaves, soils, and the lake's water phase. Soils under coniferous stands show slightly higher Hg concentrations than under deciduous forest. Hg concentrations in the water phase were higher in the oligotrophic brown water lakes (8.1 ± 5.6 ng L−1vs. 3.0 ± 1.9 ng L−1). Lower Hg concentrations in sediment trap material indicate dilution by algae organic matter in the mesotrophic lakes (0.12–0.17μg g−1vs. 0.57–0.89μg g−1). However, Hg accumulation rates in sediment traps were up to 14‐fold higher in the mesotrophic lakes (113–443μg m−2yr−1) than in the brown water lakes (32–144μg m−2yr−1), which could not be explained by higher Hg fluxes to the productive lakes. Hg mass balance calculation reveals that water phase Hg scavenging by algae is the major reason for the intense Hg export to the sediments of productive lakes which makes them significantly larger sedimentary sinks than oligotrophic brown water lakes.
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