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首页> 外文期刊>Estuarine Coastal and Shelf Science >Holocene mangrove dynamics and relative sea-level changes along the Tanzanian coast, East Africa
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Holocene mangrove dynamics and relative sea-level changes along the Tanzanian coast, East Africa

机译：东非坦桑尼亚沿海全新世红树林动态和相对海平面变化

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摘要

There is continued uncertainty regarding the rate, timing, duration and direction of Holocene sea-level for the Indian Ocean, and indeed the wider tropical realm. We present the first synthesis, and a new chronology, for Holocene relative sea-level (RSL) using a range sediment cores retrieved from mangrove ecosystems in three locations along coastal Tanzania. This study applies the relationship of ratios between the key mangrove taxa of Sonneratia:(Bruguiera/Ceriops) (S/BC) (ranging from 0 to 22.9) and Sonneratia:Rhizophora (S/R) (ranging from 0 to 2.29), vegetation and altitude to interpret mangrove dynamics and refine the vertical errors associated with relative sea level change. The variations in mangrove taxa ratios in the sediment cores obtained from each site shows mangrove development at different periods during the Holocene from around 7900 cal yr BP. An early to mid-Holocene RSL rise occurred from similar to 7900 to similar to 4600 cal yr BP that may have reached a higher level than present. A lower RSL occurred after 4600 cal yr BP, resulting in mangroves retreating seaward at all three study locations, before a low magnitude RSL rise occurred between 4400 and 2000 cal yr BP. Another RSL rise is recorded at similar to 500 cal yr BP before falling to a level lower than present at similar to 100 cal yr BP. There is evidence of a recent RSL rise recorded from mangrove ratios during the last century. In addition, the sedimentation rates among sites are relatively different due to different altitudinal ranges with freshwater input, sediment supply and progradation having significantly more effect in the Rufiji Delta (2.1-10.9 mm cal yr(-1)) than at the Zanzibar sites (0.3-6.6 mm cal yr(-1)).
机译：关于印度洋以及更广阔的热带领域，全新世海平面的速率，时间，持续时间和方向仍然存在不确定性。我们使用从坦桑尼亚沿海沿岸三个地点的红树林生态系统中获取的一系列沉积物核心，提出了全新世相对海平面（RSL）的第一个综合和新的年表。这项研究应用了Sonneratia：（Bruguiera / Ceriops）（S / BC）（介于0到22.9之间）和Sonneratia：Rhizophora（S / R）（介于0到2.29之间）的关键红树林类群之间的比率关系。和海拔高度来解释红树林动态并改善与相对海平面变化有关的垂直误差。从每个站点获得的沉积物芯中的红树林类群比率的变化表明，全新世期间约7900 cal BP的红树林在不同时期发育。全新世RSL的早期到中期出现上升，从大约7900到大约4600 cal yr BP，可能已达到目前的更高水平。在4600 cal yr BP之后出现较低的RSL，导致红树林在所有三个研究地点都向海后退，然后在4400和2000 cal BP之间出现低幅度的RSL上升。记录的另一个RSL升高类似于500 calyr BP，然后下降到低于100 calyr BP的水平。有证据表明，上个世纪红树林比率记录了最近的RSL上升。此外，由于海拔高度范围的不同，地点之间的沉积速率也相对不同，在Rufiji三角洲（2.1-10.9 mm cal yr（-1））中，淡水的输入，沉积物的供应和沉积的影响明显大于桑给巴尔地点（ 0.3-6.6毫米cal yr（-1））。

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