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首页> 外文期刊>Estuarine Coastal and Shelf Science >Effects of Zostera marina rhizosphere and leaf detritus on the concentration and distribution of pore-water sulfide in marine sediments
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Effects of Zostera marina rhizosphere and leaf detritus on the concentration and distribution of pore-water sulfide in marine sediments

机译：滨海带状菌根际和叶片碎屑对海洋沉积物中孔隙水硫化物浓度和分布的影响

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The relationship between seagrasses and pore-water hydrogen sulfide in the sediment is complex due to the opposing effects of the seagrass root system, which can reduce sulfide concentration by promoting its oxidation to sulfate, and the burial of organic matter from the plant itself, which can increase sulfide concentration by stimulating anaerobic sulfate reduction. Here, field samples of pore-water sulfide were collected in areas with and without Zostera marina shoots using Diffusive Gradients in Thin-Films (DGTs) to obtain two-dimensional visualizations of sulfide concentrations within the sediment in relation to location of eelgrass detritus and the rhizosphere. To decouple the effects of leaf detritus and the eelgrass rhizosphere on sulfide, manipulative laboratory studies were conducted over 4 weeks using 10 aquaria with or without eelgrass and different quantities of eelgrass detritus planted at 4 cm and 11 cm depths. Spatial distribution of pore-water sulfide was again measured via DGT. We found high spatial variation in pore-water sulfide concentration depending on the location analyzed relative to the rhizosphere or detritus. In the field study, pore-water sulfide concentration was greater in samples with eelgrass present, and the presence of leaf detritus accounted for higher than average sulfide concentrations in the sediment. In the laboratory experiment, sulfide concentrations localized around the leaf detritus increased with higher mass of added detritus, and sediment within the rhizosphere exhibited reduced sulfide concentrations. These results suggest that on the large scale the presence of eelgrass increases sulfide concentration, but on the smaller scale the pattern varies, with higher concentrations near buried detritus and lower concentrations near root tips.
机译：由于海草根系的相反作用，海草与沉积物中的孔隙水硫化氢之间的关系很复杂，海草根系可以通过促进其氧化成硫酸盐来降低硫化物的浓度，并掩埋植物本身的有机物，这是很复杂的。可以通过刺激厌氧硫酸盐还原来增加硫化物浓度。在这里，使用薄膜中的扩散梯度（DGT）在有无Zostera滨海芽的地区收集了孔隙水硫化物的现场样品，以获得沉积物中硫化物浓度的二维可视化，该沉积物与鳗草碎屑和藻类的位置有关。根际。为了消除叶片碎屑和鳗草根际对硫化物的影响，使用10个水族箱（有或没有鳗鱼）以及在4 cm和11 cm深度种植的不同数量的碎屑进行了为期4周的操纵性实验室研究。再次通过DGT测量孔隙水硫化物的空间分布。我们发现，根据相对于根际或碎屑的分析位置，孔隙水中硫化物的浓度存在很大的空间变化。在野外研究中，存在鳗草的样品中的孔隙水硫化物浓度更高，而叶片碎屑的存在导致沉积物中的硫化物浓度高于平均水平。在实验室实验中，随着碎屑含量的增加，叶片碎屑周围的硫化物浓度增加，而根际内的沉积物硫化物浓度降低。这些结果表明，大规模存在的鳗草增加了硫化物的浓度，但规模较小时，形态发生了变化，埋入碎屑附近的浓度较高，而根尖附近的浓度较低。

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