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广西钦州湾晚全新世红树林演变及对海平面变化的响应
引用本文:夏鹏,孟宪伟,李珍,支鹏遥,赵蒙维,王恩康.广西钦州湾晚全新世红树林演变及对海平面变化的响应[J].海洋学报(英文版),2019,38(11):111-120.
作者姓名:夏鹏  孟宪伟  李珍  支鹏遥  赵蒙维  王恩康
作者单位: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,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,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,山东科技大学, 地球科学与工程学院, 青岛, 266590,国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061,国家海洋局第一海洋研究所, 海岛海岸带研究中心, 青岛, 266061
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.
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 δ~(13)C 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 δ~(18)O 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.

关 键 词:碳同位素  红树林演变  气候变化  海平面  晚全新世
收稿时间:2018/5/3 0:00:00

Late Holocene mangrove development and response to sea level change in the northwestern South China Sea
Xia Peng,Meng Xianwei,Li Zhen,Zhi Pengyao,Zhao Mengwei and 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.
Authors:Xia Peng  Meng Xianwei  Li Zhen  Zhi Pengyao  Zhao Mengwei and Wang Enkang
Affiliation:First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China,First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Function Laboratory for Marine Geology, National Oceanography Laboratory, Qingdao 266237, China,School of Earth and Ocean Sciences, University of Victoria, British Columbia V8W 2Y2, Canada,College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China,First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China and First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Abstract: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.
Keywords:carbon isotope|mangrove development|climate change|sea level|late Holocene
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