Dynamics of surface accretion and surface elevation differ between river and tide dominated settings in tropical mangroves

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Catherine E. Lovelock, Marilyn C. Ball, Nigel Brothers, Alex Pearse, Ruth Reef
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Abstract

The maintenance of soil surface elevation in mangroves supports the persistence of mangroves with sea level rise. The processes contributing to soil surface elevation have rarely been assessed in the humid tropics, despite most mangroves occurring in river deltas and tidal estuaries within this climate zone. Using surface elevation table (SET) with marker horizon methods over sites that occurred on either the main river channel or a tidal channel, we assessed the role of rainfall and associated river discharge in moderating surface elevation in mangroves of the Daintree River, Queensland, Australia. In the sites in the main river channel close to the river mouth, increases in soil surface elevation were episodic, with river flooding leading to greater accretion of sediment and increases in surface elevation in years with high river discharge, while in the tidal channel further from the mouth, sediment accretion and surface elevation increments were variable among years and not linked to river discharge. Our study finds that the 32.7 km2 of mangroves of the Daintree River estuary have surface elevation gains that are variable but similar to current rates of sea level rise through trapping of around 40,000 t of sediment annually, mainly within the downstream mangroves and those in the main river channel. Extreme rainfall and river flows have spatially variable influences on surface elevation in mangroves of the Daintree River, which may lead to similarly variable responses to accelerating sea level rise.
在河流和潮汐主导的热带红树林环境中,地表增积和地表高程的动态变化是不同的
红树林土壤表面高度的维持支持了红树林在海平面上升时的持久性。在潮湿的热带地区,尽管大多数红树林出现在该气候带的河流三角洲和潮汐河口,但很少对土壤表面升高的过程进行评估。利用地表高程表(SET)和标记地平线方法,在主要河道或潮汐河道上的地点,我们评估了降雨和相关河流流量对澳大利亚昆士兰州丹特里河红树林地表高程的调节作用。在靠近河口的主河道中,土壤表面高程的增加是间歇性的,在河流流量大的年份,河流洪水导致了更大的泥沙增加和地表高程的增加,而在远离河口的潮汐河道中,泥沙增加和地表高程的增加在年份之间是变化的,与河流流量无关。我们的研究发现,丹特里河河口32.7平方公里的红树林的表面海拔增加是可变的,但与目前的海平面上升速度相似,主要是在下游红树林和主要河道内,每年捕获约40,000吨沉积物。极端降雨和河流流量对丹特里河红树林地表高程的影响具有空间差异性,这可能导致对海平面加速上升的响应具有类似的差异性。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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