Changes in sediment characteristics in the first year of a realigned saltmarsh
Changes in sediment characteristics in the first year of a realigned saltmarsh
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DOI：
10.1016/j.ecss.2021.107684
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
Leda L. Cai;T. Helgason;K. Redeker
中科院分区：
文献类型：
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作者：
Leda L. Cai;T. Helgason;K. Redeker
盐沼恢复被描述为对沿海生物多样性丧失和洪水管理的一种具有成本效益的对策，尽管迄今为止，这种养护做法产生了与自然沼泽不同的特征，例如植物群落和沉积物特性。这些差异的结果被认为是由沼泽重建的第一年内设置的初始条件的影响，这往往是被忽视或忽视的恢复过程的一部分。因此，我们的研究旨在解决这一差距，通过研究沉积物特征的空间和时间变化的新（<15个月）重新排列的盐沼在埃塞克斯，英国和以前的土地利用（耕地和牧场）的影响。沉积物的性质（体积密度，营养物质和pH值）采样每月从重新调整的网站，以及从相邻的参考天然沼泽。14个月后，从最初的淹没的两个重新排列的沼泽地区（耕地和牧场）表现相似，尽管不同的起点在pH值，含水量，体积密度和营养负荷。物理方面的重新排列的沉积物（体积密度和含水量）相匹配的参考天然沼泽在14个月内突破后，在0-5厘米的深度范围。相比之下，较低深度的沉积物内重新调整网站仍然更密集和干燥的天然沼泽沉积物相比。重新排列的沉积物的化学性质相匹配的天然沼泽整个沉积物剖面14个月后违反。恢复的成功是衡量网站的能力，提供所需的生态系统服务和短期恢复和设定的目标可能并不意味着长期的可持续性，因为这些观察到的差异可能会对未来的生物群落的发展和恢复的成功产生影响。
Saltmarsh restoration is described as a cost-effective response to coastal biodiversity loss and flood management, although, to date such conservation practices yield different characteristics than natural marshes, such as in plant communities and sediment properties. The outcome of these differences is thought to be influenced by the initial conditions set within the first year of marsh re-establishment, which are often overlooked or neglected as part of the restoration process. Therefore, our study aimed to address this gap by examining the spatial and temporal variations in sediment characteristics of a newly (<15 months) realigned saltmarsh in Essex, UK and the effects of previous land use (arable and pasture). Sediment properties (bulk density, nutrients and pH) were sampled monthly from the realigned site as well as from an adjacent reference natural marsh. After 14 months from initial inundation the two realigned marsh regions (arable and pasture) behaved similarly despite different starting points in terms of pH, water content, bulk density and nutrient load. Physical aspects of the realigned sediments (bulk density and water content) matched those of the reference natural marsh within 14 months post-breach in the 0–5 cm depth range. By contrast, the lower depth sediments within realigned sites remained more dense and drier compared to natural marsh sediments. Chemical properties of the realigned sediments matched those of the natural marsh throughout the sediment profile 14 months post-breach. Success of restoration is measured in the ability of the site to provide the desired ecosystem services and short-term recoveries and set goals may not imply long term sustainability as these observed differences may have ramifications for future biological community development and the success of a restoration.