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首页> 外文期刊>Estuarine Coastal and Shelf Science >The effect of vegetation height and biomass on the sediment budget of a European saltmarsh
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The effect of vegetation height and biomass on the sediment budget of a European saltmarsh

机译：植被高度和生物量对欧洲盐沼沉积物收支的影响

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Sediment retention in saltmarshes is often attributed to the presence of vegetation, which enhances accretion by slowing water flow, reduces erosion by attenuating wave energy and increases surface stability through the presence of organic matter. Saltmarsh vegetation morphology varies considerably on a range of spatial and temporal scales, but the effect of different above ground morphologies on sediment retention is not well characterised. Understanding the biophysical interaction between the canopy and sediment trapping in situ is important for improving numerical shoreline models. In a novel field flume study, we measured the effect of vegetation height and biomass on sediment trapping using a mass balance approach. Suspended sediment profilers were placed at both openings of a field flume built across-shore on the seaward boundary of an intertidal saltmarsh in the Dengie Peninsula, UK. Sequential removal of plant material from within the flume resulted in incremental loss of vegetation height and biomass. The difference between the concentration of suspended sediment measured at each profiler was used to determine the sediment budget within the flume. Deposition of material on the plant/soil surfaces within the flume occurred during flood tides, while ebb flow resulted in erosion (to a lesser degree) from the flume area, with a positive sediment budget of on average 6.5 g m(-2) tide(-1) with no significant relationship between sediment trapping efficiency and canopy morphology. Deposition (and erosion) rates were positively correlated to maximum inundation depth. Our results suggest that during periods of calm conditions, changes to canopy morphology do not result in significant changes in sediment budgets in marshes. (C) 2018 Elsevier Ltd. All rights reserved.
机译：盐沼中的沉积物滞留通常归因于植被的存在，植被通过减缓水流而增加积聚，通过减弱波能来减少侵蚀，并通过存在有机物来增加表面稳定性。盐沼植被形态在一定的时空范围内变化很大，但地面上不同形态对沉积物滞留的影响尚不十分清楚。了解冠层和沉积物原位捕集之间的生物物理相互作用对于改进数值海岸线模型非常重要。在一项新颖的田间水槽研究中，我们使用质量平衡方法测量了植被高度和生物量对沉积物捕集的影响。悬挂的泥沙剖面仪放置在英国丹吉半岛潮间带盐沼向海边界跨岸建造的田间水槽的两个开口处。从水槽中依次去除植物材料会导致植被高度和生物量的增加。在每个剖面仪上测得的悬浮沉积物浓度之间的差用于确定水槽内的沉积物预算。洪水期间，水槽内植物/土壤表面的物质沉积发生，潮退导致水槽区域的侵蚀（程度较小），平均沉积物预算为6.5 gm（-2）潮汐（ -1）沉积物捕集效率与冠层形态之间无显着关系。沉积（和侵蚀）速率与最大淹没深度呈正相关。我们的结果表明，在平静的时期，冠层形态的变化不会导致沼泽沉积物收支的显着变化。 （C）2018 Elsevier Ltd.保留所有权利。

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