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

MENG Xianwei; XIA Peng; LI Zhen; LIU Lejun

doi:10.1007/s13131-015-0778-5

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Article Navigation > Acta Oceanologica Sinica > 2016 > 35(2): 95-100

MENG Xianwei, XIA Peng, LI Zhen, LIU Lejun. 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[J]. Acta Oceanologica Sinica, 2016, 35(2): 95-100. doi: 10.1007/s13131-015-0778-5

Citation:

MENG Xianwei, XIA Peng, LI Zhen, LIU Lejun. 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[J]. Acta Oceanologica Sinica, 2016, 35(2): 95-100. doi: 10.1007/s13131-015-0778-5

Citation:

MENG Xianwei, XIA Peng, LI Zhen, LIU Lejun. 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[J]. Acta Oceanologica Sinica, 2016, 35(2): 95-100. doi: 10.1007/s13131-015-0778-5

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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

doi: 10.1007/s13131-015-0778-5

1.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Marine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2014-10-21
Rev Recd Date: 2015-06-16

Abstract

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 (δ¹³C_org) 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.
- Holocene climatic optimum,
- mangrove-derived organic matter,
- degradation of mangrove forests,
- Asian monsoon,
- Qinzhou Bay

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