Quantifying reef-derived sediment generation: Introducing the SedBudget methodology to support tropical coastline and island vulnerability studies
Quantifying reef-derived sediment generation: Introducing the SedBudget methodology to support tropical coastline and island vulnerability studies
复制标题
量化珊瑚礁沉积物的生成：引入 SedBudget 方法来支持热带海岸线和岛屿脆弱性研究
DOI：
10.1017/cft.2023.14
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Perry C
中科院分区：
文献类型：
--
作者：
Perry C
目前还没有评估珊瑚礁沉积物生成率的标准化方法。这是在更好地预测珊瑚礁海岸沉积物供应方面存在的一个重大知识差距。这里介绍的普查为基础的SedBudget方法生成的沉积物组成和粒度生产的函数的丰度和生产力的主要沉积物生成类群在珊瑚礁网站的估计。该方法最初应用于印度洋北方查戈斯群岛的几个珊瑚礁，产生的总沉积量估计值范围为（平均值±标准误差）0.7 ± 0.1至4.3 ± 1.3千克CaCO 3 m−2 yr−1。沉积物的产生主要由鹦嘴鱼（在大多数地点>90%），海胆（高达20%）、石内海绵（~1-7%）和底栖有孔虫（~0.5-3.5%）的次要贡献随地点而异。预计这些分类群水平的贡献将产生沉积物，在所有地点都是珊瑚（83-94%）和甲壳珊瑚藻类为主（范围~ 5-12%）。这些估计和沉积数据之间的比较，从近端的珊瑚礁和岛屿海滩样本一般表现出高度的一致性，建议的SedBudget方法的承诺。最后，我们概述了额外的数据集和修订的方法是最需要的，以提高速率估计，并希望该方法将刺激周围的沉积物产生，运输和海岸线维护问题的研究。
Standardised methodologies for assessing reef-derived sediment generation rates do not presently exist. This represents a major knowledge gap relevant to better predicting reef-derived shoreline sediment supply. The census-based SedBudget method introduced here generates estimates of sediment composition and grain-size production as a function of the abundance and productivity of the major sediment-generating taxa at a reef site. Initial application of the method to several reefs in the northern Chagos Archipelago, Indian Ocean, generated total sediment generation estimates ranging from (mean ± SE) 0.7 ± 0.1 to 4.3 ± 1.3 kg CaCO3 m−2 yr−1. Sediment production was dominated by parrotfishes (>90% at most sites), with site-variable secondary contributions from sea urchins (up to 20%), endolithic sponges (~1–7%) and benthic foraminifera (~0.5–3.5%). These taxa-level contributions are predicted to generate sediments that at all sites are coral- (83–94%) and crustose coralline algae-dominated (range ~ 5–12%). Comparisons between these estimates and sedimentary data from proximal reef and island beach samples generally show a high degree of consistency, suggesting promise in the SedBudget approach. We conclude by outlining areas where additional datasets and revised methodologies are most needed to improve rate estimates and hope that the methodology will stimulate research on questions around sediment production, transport and shoreline maintenance.