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Mid-Holocene mangrove succession and its response to sea-level change in the upper Mekong River delta, Cambodia

Published online by Cambridge University Press:  27 July 2012

Zhen Li ,
Yoshiki Saito ,
Limi Mao ,
Toru Tamura ,
Zhen Li ,
Bing Song ,
Yulan Zhang ,
Anqing Lu ,
Sotham Sieng  and
Jie Li
Zhen Li*
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Yoshiki Saito
Affiliation:
Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba 305‐8567, Japan
Limi Mao
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Toru Tamura
Affiliation:
Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba 305‐8567, Japan
Zhen Li*
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China Nagoya University, Graduate School of Environmental Studies, Nagoya, Aichi 4648601, Japan
Bing Song
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Yulan Zhang
Affiliation:
School of Ocean and Earth Science, Tongji University, Shanghai 200092, China
Anqing Lu
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
Sotham Sieng
Affiliation:
Department of Geology, General Department of Mineral Resources, Ministry of Industry, Mining and Energy, Phnom Penh, Cambodia
Jie Li
Affiliation:
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China Yunnan Institute of Environmental Science, No. 23 Wang Jiaba, Kunming 650034, China
*
⁎Corresponding author. Fax: + 86 21 6254641. Email Address:[email protected], [email protected]
⁎Corresponding author. Fax: + 86 21 6254641. Email Address:[email protected], [email protected]
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Abstract

Middle Holocene vegetation and mangrove successions are clearly evident in the palynological records of two cores from the upper Mekong River delta in Cambodia. Spanning from ~ 9.4 to 6.3 cal ka BP, the cores mainly record a transgressive sequence from floodplain freshwater marsh to tidal flat, which was overlain by mangrove. Corresponding to the decelerated sea-level rise at ~ 8.3 cal ka BP, pioneer mangrove species Sonneratia alba and Sonneratia caseolaris appeared in the sediments, and then was replaced by regressive mangrove succession containing upward-increasing abundances of Rhizophora apiculata and Bruguiera spp. High salinity- and flooding-tolerant community S. alba was developed at the western core site PSG at ~ 8.2 cal ka BP, and the eastern core site PK at ~ 7.5 cal ka BP. The time difference of S. alba appearance between the two sites might be resulted from the complexity of sedimentary environment, where a higher sediment supply was provided to the western floodplain than to the eastern floodplain. After 7.5 cal ka BP, aggradational stacking of intertidal sediments, of which the thickness is larger than the present maximum tidal range, may have resulted from continuous sea-level rise during 7.5–7.0 cal ka BP.

Keywords

Palynological analysisMangrove successionSea-level changeMekong River deltaCambodia
Type
Articles
Information
Quaternary Research , Volume 78 , Issue 2 , September 2012 , pp. 386 - 399
Copyright
University of Washington

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