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Dramatical hydro-sedimentary changes induced by bamboo fences over mangrove tidal flat of the largest delta in Beibu Gulf, southwestern China

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Acta Oceanologica Sinica 2023年第7期42卷 103-115页

作者： Zuming Huang Zhijun Dai Riming Wang Xiaoyan Zhou Wenhong Pang Jiejun Luo Bingbin Feng Baoqing Hu Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf Qinzhou 535011China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China Key Laboratory of Coastal Science and Engineering/Qinzhou Key Laboratory for Eco-Restoration of Environment Beibu Gulf UniversityGuangxi 535011China Key Laboratory of Environment Change and Resources Use in Beibu Gulf(Nanning Normal University) Ministry of EducationNanning 530001China

mangrove forest is one of the most important ecological and environmental resources by effectively promoting tidal flat deposition and preventing the coastal region from ***,there have been mass loss of mangrove forests due to anthropogenic *** is an urgent need to explore an effective way for mangrove ***,three rows of bamboo fences with hydro-sedimentary observation set over Aegiceras corniculatum mangrove tidal flat of the Nanliu Delta,the largest delta of Beibu Gulf,China,were conducted to analyze the hydro-sedimentary variations induced by bamboo *** identified that the mean horizontal velocity Um per burst(20 min)decreased by as much as 71%and 40%in comparison with those without bamboo fences in March and November,respectively,when the tidal current entering the bamboo area during *** maximum of mean horizontal flow velocity Um-max at bamboo area was 50%–75%of that without bamboo fences during ebb *** suspended sediment concentration of bamboo area suggested a maximum reduction of 57%relative to bare flat during flood,and was 80%lower than bare flat at ebb ***,the turbulent kinetic dissipationεat flood tide was significantly higher than that at ebb tide,while the bamboo fences greatly increased the turbulent kinetic dissipationεby 2 to 5 times relative to bare flat,resulting in an increase of the bed elevation by inhibiting the sediment incipient motion and intercepting suspended *** siltation rate at the bamboo area was 140%and 29.3%higher than that at the bare flat and the region covered with ***,*** results highlight that bamboo fences can effectively attenuate tidal current and thus promote siltation over mangrove flat,which contribute great benefit to mangrove survival.

关键词： mangrove tidal flat bamboo fences hydro-sedimentary process bed siltation

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Seasonal Distribution of Meiofaunal Assemblages in the mangrove tidal flat of Futian,Shenzhen,China

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Journal of Ocean University of China 2022年第4期21卷 955-964页

作者： SONG Yuanliu YAN Cunjun GAO Chunzi XU Hualin HUA Er LIU Xiaoshou College of Marine Life Sciences Frontiers Science Center for Deep Ocean Multispheres and Earth SystemOcean University of ChinaQingdao 266003China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China Guangdong Neilingding-Futian National Reserve Administration Bureau Shenzhen 518040China

Meiofauna are fundamental components in mangrove ecosystem which play important roles in the energy flow and mat-ter *** order to reveal the spatio-temporal distribution of meiofaunal assemblages in mangrove habitats,sediment samples were collected in July(summer)and October(autumn)of 2013,January(winter)and April(spring)of 2014 in the mangrove tidal flat of Futian,Shenzhen,China.A total of 14 meiofaunal taxa were identified,including free-living marine nematodes,benthic copepods,polychaetes,oligochaetes,ostracods,isopods,***,there were also undetermined *** showed that the abun-dance range of meiofauna was(488.35±71.29)-(5136.36±623.38)ind(10 cm)−*** nematodes were the most dominant group,with an average abundance of(1869.56±227.92)ind(10 cm)−2,accounting for 98.35%of the total abundance of *** sea-sonal distribution of meiofauna showed that the abundance was the highest in summer,followed by those in spring,winter,and *** distribution showed that meiofauna were mainly distributed in the upper sediment layer(0-5 cm),with a proportion of 89.56%.Correlation analysis between meiofauna and environmental factors showed that meiofaunal abundance and biomass had significantly negative correlation with *** analysis between meiofaunal assemblages and environmental factors show-ed that meiofaunal assemblages were affected by the combined effects of temperature,salinity,sediment median grain size,water content,and chlorophyll a content.

关键词： meiofauna taxa composition abundance mangrove tidal flat seasonal distribution

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Coastal geomorphic evolution at the Denglou Cape, the Leizhou Peninsula

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Acta Oceanologica Sinica 2002年第4期21卷 597-611页

作者： Wang Lirong(王丽荣) Zhao Huanting(赵焕庭) Song Chaojing(宋朝景) Yuan Jiayi(袁家义) Yu Hongbing(于红兵) South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Department of Geoscience Zhongshan University Guangzhou 510275 China South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

The Denglou Cape, southwest of the Leizhou Peninsula, is the most typical tropical coast in the continent of *** coastal geomorphic development basics of the geology and Quaternary environment change are discussed. Aerial photograph interpretation with fieldwork is applied to draw the outlines of geomorphic types. Based on the investigative data, the exogenic forces and marine organism conditions concerning tropical coast development in the area are expounded, and coastal dynamo-deposition geomorphic bodies are analysed, mainly with sea cliff-abrasion platform,barrier-lagoon system, modern beach, coral reef and mangrove tidal flat, and the general process of coastal evolution at this area, as well as coastline changes since middle Holocene transgression.

关键词： Tropical coastal geomorphology coral reef mangrove tidal flat barrier-lagoon system cape Leizhou Peninsula view of turf management,a comprehensive assessment indices system for turf quality is proposed,i.e.,landscape quality assessment

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