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Acta Oceanologica Sinica

, Volume 35, Issue 2, pp 95–100 | Cite as

Mangrove forest degradation indicated by mangrove-derived organic matter in the Qinzhou Bay, Guangxi, China, and its response to the Asian monsoon during the Holocene climatic optimum

  • Xianwei Meng
  • Peng XiaEmail author
  • Zhen Li
  • Lejun Liu
Article

Abstract

The response of mangrove ecosystems to the Asian monsoon in the future global warming can be understood by reconstructing the development of mangrove forests during the Holocene climatic optimum (HCO), using proxies preserved in coastal sediments. The total organic matter in sediments of a segmented core, with calibrated age ranges between 5.6 and 7.7 cal. ka BP and corresponding to the HCO, from the Qinzhou Bay in Guangxi, China, is quantitatively partitioned into three end-members according to their sources: mangrove-derived, terrigenous, and marine phytoplanktonic, using a three-end-member model depicted by organic carbon isotope (δ 13Corg) and the molar ratio of total organic carbon to total nitrogen (C/N). The percentage of mangrove-derived organic matter (MOM) contribution is used as a proxy for mangrove development. Three visible drops in MOM contribution occurred at ca. 7.3, ca. 6.9, and ca. 6.2 cal. ka BP, respectively, are recognized against a relatively stable and higher MOM contribution level, indicating that three distinct mangrove forest degradations occurred in the Qinzhou Bay during the HCO. The three mangrove forest degradations approximately correspond to the time of the strengthened/weakened Asian winter/summer monsoon. This indicates that even during a period favorable for the mangrove development, such as the HCO, climatic extremes, such as cold and dry events driven by the strengthened/weakened Asian winter/summer monsoon, can trigger the degradation of mangrove forests.

Key words

Holocene climatic optimum mangrove-derived organic matter degradation of mangrove forests Asian monsoon Qinzhou Bay 

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Copyright information

© The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.First Institute of OceanographyState Oceanic AdministrationQingdaoChina
  2. 2.Laboratory for Marine Geology and EnvironmentQingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghaiChina

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