| 基于风暴潮记录研究红树林淤积速率时间变化 |
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| 引用本文： | 刘涛,褚冠宇,徐慧鹏.基于风暴潮记录研究红树林淤积速率时间变化[J].沉积学报,2022,40(5):1346-1354. |
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| 作者姓名： | 刘涛 褚冠宇 徐慧鹏 |
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| 作者单位： | 1.南宁师范大学北部湾环境演变与资源利用教育部重点实验室，南宁 530001 |
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| 基金项目： | 广西省自然科学基金DD3100051017 |
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| 摘 要： | 以广西北海市的金海湾红树林作为研究对象，研究了红树林沉积物的粒度和过剩210Pb比活度特征，并结合当地风暴潮历史记录，识别红树林沉积中风暴沉积层并判定了其形成时间。结果表明:自1965年以来广西沿岸的5次强风暴潮在该红树林中留下了沉积记录；以这些风暴沉积层作为时间标志，可知1986—2008年，红树林前缘区的沉积速率为5.7 mm/a，内侧为7.3 mm/a；2008年以后，前缘区沉积速率降至2 mm/a，而内测沉积速率则增加至14~20 mm/a。2008年之后当地风暴潮频率增加可能是造成这一现象的主要原因。红树林前缘区风暴沉积粒度特征的分析表明，在强风暴潮期间，植株高大、树冠封闭度高的红树林对于波流能量的耗散程度要显著高于年龄较小、植株低矮的红树林。
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| 关 键 词： | 红树林 风暴潮 沉积速率 粒度 波能耗散 |
| 收稿时间： | 2020-06-23 |
Using Storm Deposition in Mangrove for Dating and Sedimentary Dynamic Analysis |
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| Institution: | 1.Key Laboratory of Beibu Gulf Environment Change and Resources Use, Ministry of Education (Nanning Normal University), Nanning 530001, China2.School of Marine Sciences, Guangxi University, Nanning 530004, China |
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| Abstract: | The ages of storm deposit layers in sediment cores collected from the Jinhaiwan mangrove area in Guangxi， China， were determined from the accretion rate estimated by the 210Pb method， together with records of storm surges. Temporal changes of accretion rate in the mangroves were studied using the storm deposit layers as time markers. Since 1986， the accretion rate was 5.7 mm/a at the margin and 7.3 mm/a inside the mangrove area. Since 2008， the accretion rate at the margin has only been 2 mm/a， but was 14?20 mm/a inside the mangrove area， attributable to the increased frequency of storm surges. The grain sizes of storm deposits in the mangrove area indicate that the dissipation rate of current/wave energy in mangrove area is greatly affected by the plant structure. The storm deposit at the margin of an area of old mangroves is significantly finer than at the young mangrove margin， indicating a higher dissipation rate of current/wave energy in the old mangrove. Old， tall mangrove plants with bigger crowns dissipate the current/wave energy more efficiently in the surface layer of the water column. |
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