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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Mangrove development and its response to environmental change in Yingluo Bay (SW China) during the last 150 years: Stable carbon isotopes and mangrove pollen
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Mangrove development and its response to environmental change in Yingluo Bay (SW China) during the last 150 years: Stable carbon isotopes and mangrove pollen

机译：英罗湾（中国西南地区）过去150年的红树林发展及其对环境变化的响应：稳定的碳同位素和红树林花粉

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摘要

Located at the interface of terrestrial and marine ecosystems, mangroves are particularly sensitive to environmental change. They provide a sedimentary sink for organic carbon, whereby cores can provide detailed records of mangrove species. We aimed to trace the history of mangrove development over the past 150 years in Yingluo Bay, SW China. Sedimentation rates (avg. 0.32 and 0.37 cm/year) were calculated on the basis of ln(Pb-210(ex)) vs. mass depth, and offset the rate of relative sea level rise (0.22-0.24 cm/year), leading to a seaward expansion of new mangrove habitats. Chemical tracers (delta C-13(org) and C:N) and an isotope mixing model were utilized to trace the contribution of mangrove-derived organic matter (MOM). Changes in the relative abundance of pollen from mangrove plants was used to compensate for diagenetic alteration of the stable isotope values and potential overlaps in isotope values for different sources of organic matter. The result of Pearson correlation analysis showed that the MOM was moderately positive correlated with total mangrove pollen, indicating that stable carbon isotopes and mangrove pollen provide similar information for tracing mangrove ecosystems. Based on results from this study, compositional changes in mangrove communities could be divided into two main stages: a degradation period (1870-1930 AD) and a flourishing period (1930-2011 AD), corresponding to colder temperature and warmer temperature, respectively. Owing to the location being far away from any industrial area and human activity, temperature may be a key factor for mangrove development. (C) 2015 Elsevier Ltd. All rights reserved.
机译：红树林位于陆地和海洋生态系统的交界处，对环境变化特别敏感。它们为有机碳提供了一个沉积池，核心可以提供红树林物种的详细记录。我们的目的是追溯中国西南地区英罗湾红树林发展的过去150年的历史。根据ln（Pb-210（ex））与质量深度的关系计算出沉积速率（分别为0.32和0.37 cm /年），并抵消了相对海平面上升的速率（0.22-0.24 cm /年），导致新的红树林栖息地向海扩展。利用化学示踪剂（δC-13（org）和C：N）和同位素混合模型来追踪红树林衍生的有机物（MOM）的贡献。红树林植物花粉相对丰度的变化用于补偿稳定同位素值的成岩作用变化以及不同有机物来源同位素值的潜在重叠。皮尔森相关分析的结果表明，MOM与红树林花粉总量呈正相关，表明稳定的碳同位素和红树林花粉为追踪红树林生态系统提供了相似的信息。根据这项研究的结果，红树林群落的组成变化可分为两个主要阶段：退化期（公元1870-1930年）和繁盛期（公元1930-2011年），分别对应于较低的温度和较高的温度。由于该位置远离任何工业区和人类活动，温度可能是红树林发展的关键因素。 （C）2015 Elsevier Ltd.保留所有权利。

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