| Xia Peng,Meng Xianwei,Li Zhen,Zhi Pengyao,Zhao Mengwei,Wang Enkang.Late Holocene mangrove development and response to sea level change in the northwestern South China Sea[J].Acta Oceanologica Sinica,2019,38(11):111-120 |
| 广西钦州湾晚全新世红树林演变及对海平面变化的响应 |
| Late Holocene mangrove development and response to sea level change in the northwestern South China Sea |
| 投稿时间：2018-05-03 |
| DOI：10.1007/s13131-019-1359-9 |
| 中文关键词: 碳同位素 红树林演变 气候变化 海平面 晚全新世 |
| 英文关键词:carbon isotope|mangrove development|climate change|sea level|late Holocene |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41576067 and 41576061; the Basic Scientific Fund for National Public Research Institutes of China under contract No. 2017Q03; the National Basic Research Program (973 Program) of China under contract No. 2010CB951203. |
| 作者 | 单位 | E-mail | | 夏鹏 | 国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061
山东科技大学, 地球科学与工程学院, 青岛, 266590 | | | 孟宪伟 | 国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061
青岛海洋科学与技术国家实验室, 海洋地质过程与环境功能实验室, 青岛, 266237 | mxw@fio.org.cn | | 李珍 | 维多利亚大学, 地球与海洋科学学院, 加拿大 维多利亚市, V8W 2Y2 | | | 支鹏遥 | 山东科技大学, 地球科学与工程学院, 青岛, 266590 | | | 赵蒙维 | 国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061 | | | 王恩康 | 国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061 | |
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| 中文摘要: |
| 地处热带北缘的钦州湾，红树林广泛发育；同时，该区受亚洲季风、海平面变化和人类活动等的影响显著。为了预测未来气候变化和人类活动对红树林生态系统的影响机制，可以通过埋藏在沉积物中的有机碳稳定同位素信息来重建历史时期红树林演变及其响应。本文采用δ13Corg和C：N三端元混合模型，在AMS14C年代框架构建的基础上，对钦州湾脆弱红树林湿地埋藏有机质来源进行了定量分离。研究发现：1）红树林源有机质（MOM）贡献可以用来作为晚全新世红树林演变的示踪指标；2）进而将MOM与古气候（石笋δ18O、海平面变化和粒度参数等）和人类活动记录进行对比后发现，可将2.34 cal ka BP以来的红树林演变划分为三个阶段：①繁盛期（2.34-1.13 cal ka BP），具有较高的MOM贡献（（88.9±10.6）%），对应温暖湿润气候下稳定的高海平面；②相对衰退期（1.13-0.15 cal ka BP），亚洲冬季风增强背景下海平面迅速下降，导致红树林发生衰退和MOM减少（（62.4±18.9）%）；③加速衰退期（0.15-0 cal ka BP），红树林湿地的虾塘围垦等人类活动是导致红树林加速衰退和MOM持续减少的主要原因；3）人类世（~150 cal ka BP）之前，相比气温和降水，海平面下降是控制红树林演变的主要因素。 |
| 英文摘要: |
| Mangroves, widely distributed along the coasts of tropical China, are influenced by Asia monsoon, relative sea level change and enhanced human activity. To predict the impacts of future climate change on mangrove ecosystems, it can be understood by reconstructing past mangrove dynamics using proxies preserved in coastal sediments. In this study, we quantitatively partitioned buried organic matter (OM) sources, collected from a vulnerable mangrove swamp in the Qinzhou Bay of northwestern South China Sea, using a ternary end-member mixing model of δ13C and C:N values. Mangrove-derived OM (MOM) contribution was used as a tracer for mangrove development since 2.34 cal ka BP. This information, together with paleoclimate records (i.e., speleothem δ18O values, sea level change, grain size parameters) and human activity, was used to divide mangrove development into three stages during the late Holocene: relative flourish (2.34–1.13 cal ka BP), relative degradation (1.13–0.15 cal ka BP) and further degradation (0.15–0 cal ka BP). Before 1.13 cal ka BP, mangroves flourished with a high MOM contribution ((88.9±10.6)%), corresponding to stable and high sea level under a warm and humid climate. After 1.13 cal ka BP, rapid fall in relative sea level coupled with the strengthening of the Asian winter monsoon, resulted in mangrove degradation and MOM reduction ((62.4±18.9)%). Compared with air temperature and precipitation, the relative sea level fall was the main controlling factor in mangrove development before entering the Anthropocene (the time of the Industrial Revolution). After ~150 cal a BP, reclamation of mangrove swamps to shrimp ponds is the main factor causing mangrove degradation and MOM reduction. |
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