TAILIEUCHUNG - Báo cáo " Palynological investigation from a deep core at the coastal area of the Red River Delta, Vietnam"

Palyno1ogica1 study in a deep core ( m depth) in the coasta1 area of the Red River De1ta, Vietnam provides evidences on vegetation change in the regiona1 area in abou!12000 years before present. This research aims to reconstruct the vegetation deve1opment and pa1eoenvironmenta1 changes in the Red River De1ta, Vietnam during the Ho1ocene. These data show !hat the region supported a Fagaceae-Coniferous, especially Quercus, Pinus và Castanopsis, simi1ar to contemporary vegetation described in Vietnam and southeast China. Tropica1 broadleaf forest dominated at the time right after BP. At the same time, Scyphiphora hydrophyl/aceae is the dominant wood species in. | VNU Journal of Science Earth Sciences 25 2009 192-203 Palynological investigation from a deep core at the coastal area of the Red River Delta Vietnam Nguyen Thuy Duong Hanoi University of Science VNU 334 Nguyen Trai Hanoi Vietnam Received 15 November 2009 Abstract. Palynological study in a deep core m depth in the coastal area of the Red River Delta Vietnam provides evidences on vegetation change in the regional area in about 12000 years before present. This research aims to reconstruct the vegetation development and paleoenvironmental changes in the Red River Delta Vietnam during the Holocene. These data show that the region supported a Fagaceae-Coniferous especially Quercus Pinus và Castanopsỉs similar to contemporary vegetation described in Vietnam and southeast China. Tropical broadleaf forest dominated at the time right after BP. At the same time Scyphiphora hydrophyỉỉaceae is the dominant wood species in the back mangrove forest at the studied area. After this time the climate became warmer although there were several periods with colder climate in between. Keywords palynology paleoecology Red River pollen spore paleoenvironment. 1. Introduction Whereas the Late Quaternary vegetational history of large parts of the world is fairly well documented and palynological studies in the Red River Delta are numerous little attention has been paid to the Holocene vegetation history of North-Vietnam 1-3 . Most of the available palynological studies in Vietnam were focused on characterize the sedimentary strata in regional geological mapping 4 and in archaeology 5 6 . Using pollen records and other microfossil records for Holocene palaeogeography reconstruction sea level change and climate history 7-12 was still limited and only reached a low temporal resolution. Recently Li et al. 13 presented a E-mail detailed and well-dated reconstruction of Holocene climate change in the Red River delta. More records are need to advance our standing

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