Effects of waves, burial depth and material density on microplastic retention in coastal sediments.
Effects of waves, burial depth and material density on microplastic retention in coastal sediments.
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DOI：
10.1016/j.scitotenv.2022.161093
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Nanhao Xu;Zhenchang Zhu;Weilun Gao;D. Shao;Shaorui Li;Q. Zhu;Zhongya Fan;Y. Cai;Zhifeng Yang
中科院分区：
文献类型：
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作者：
Nanhao Xu;Zhenchang Zhu;Weilun Gao;D. Shao;Shaorui Li;Q. Zhu;Zhongya Fan;Y. Cai;Zhifeng Yang
沿海沉积物被认为是微塑料（MP）的主要汇，经常受到物理扰动，如波浪扰动和相关的沉积物动力学。然而，它仍然知之甚少波干扰如何调节MP积累在这样一个动态的环境。在这里，我们研究了波浪及其相互作用与材料的密度和埋深对MP在沿海沉积物中的保留，通过操纵实验在沿着中国南部海岸的红树林栖息地。结果清楚地表明，更强的波浪从沉积物中去除了更多的埋藏MP。此外，风暴可以通过引起大浪和强烈的泥沙侵蚀对MP保留产生不成比例的影响。我们还表明，MP的保留一般增加线性增长的物质密度和非线性增加的埋藏深度在沉积物中。总体而言，我们的研究结果强调了外部和内部因素在塑造红树林等沿海生态系统中MP保留的重要性，这对于评估和预测MP积累模式及其对此类蓝碳栖息地生态系统功能的影响至关重要。
Coastal sediments, recognized as a major sink for microplastics (MPs), are subject to frequent physical disturbances, such as wave disturbance and associated sediment dynamics. Yet it remains poorly understood how wave disturbance regulates MPs accumulation in such a dynamic environment. Here, we examined the effects of waves and their interactions with material density and burial depth on the retention of MPs in coastal sediments, through manipulative experiments in a mangrove habitat along the coast of South China. The results clearly revealed that stronger waves removed more buried MPs from the sediments. Moreover, storms can have disproportional effects on MPs retention by inducing large waves and strong sediment erosion. We also demonstrated that MPs retention generally increased linearly with growing material density and non-linearly with raised burial depth in the sediment. Overall, our findings highlight the importance of both external and internal factors in shaping MPs retention in coastal ecosystems like mangroves, which is essential to assess and predict MPs accumulation patterns as well as its impacts on ecosystem functioning of such blue carbon habitats.