最大浊度区在河口红树林沼泽沉积动力学中的重要作用

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2023-12-28 DOI:10.1007/s11707-022-1083-1
Tao Liu, Ying Liu, Baoqing Hu
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引用次数: 0

摘要

沉积是影响湿地可持续性和碳埋藏通量的一个关键过程。在海平面上升、气候变化和人类活动的背景下,进一步了解湿地沉积动态对于预测景观演变或碳埋藏通量的变化至关重要。本研究基于对南流江河口红树林系统的实地水文观测,发现在表层形成浊度最大区(TMZ)的潮汐周期中,红树林的悬浮泥沙净通量为 39-72 kg/m,而在没有形成浊度最大区的潮汐周期中,红树林的悬浮泥沙净通量仅为 9-18 kg/m。在表层形成浊度最高区的潮汐周期中,红树林的悬浮沉积物净通量较高,这是因为涨潮时 SSC 高,红树林中的絮凝作用强烈。红树林斑块沉积速率的巨大差异也可以用河口表层形成沼泽化带的概率来解释。未来,海平面的快速上升可能会导致河口 TMZ 模式的改变,从而导致湿地沉积速率出现不可忽略的变化。根据目前的湿地沉积速率数据,河口湿地的脆弱性可能被误判。
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The important role of Turbidity Maximum Zone in sedimentary dynamic of estuarine mangrove swamp

Sedimentation is a key process affecting wetland sustainability and carbon burial flux. In context of sea level rise, climate change and human activities, further understanding about the sedimentary dynamic in wetland is critical in predicting the landscape evolution or the change in carbon burial flux. In this study, based on the field hydrological observation in a mangrove system in the Nanliu River estuary, we found the net flux of suspended sediment to mangrove is 39–72 kg/m in tidal cycles with Turbidity Maximum Zone (TMZ) forming in surface layer and only is 9–18 kg/m in tidal cycles without TMZ. The higher net flux of suspended sediment to mangrove in tidal cycles with TMZ forming in surface layer is attributed to high SSC in rising tide and intense flocculation in mangrove. The significant discrepancy in sedimentation rate in the mangrove patches also can be explained by the probability of TMZ forming in the surface layer of estuary. In future, rapid sea level rising may lead to the change of TMZ pattern in estuary, which will result in non-negligible variation in sedimentation rate in wetlands. According to the present data of sedimentation rate in wetlands, the fragility of wetlands in river estuary may be miscalculated.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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