Spatial distribution pattern of mangrove community in tidal flats of the Qinjiang Estuary
- Vol. 26, Issue 6, Pages: 1143-1154(2022)
Published： 07 June 2022
DOI： 10.11834/jrs.20221540
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摘要
红树林群落是热带亚热带河口有特色的生态系统，在消浪促淤及存储碳方面具有重要价值。但受到全球海平面上升与人为干扰影响，红树林生境受到破坏，群落结构脆弱。基于此，本文以现场校核的无人机正射影像为数据源，结合历史遥感影像、钦江河口水体盐度与潮滩沉积物采样分析，研究钦江河口潮滩红树林群落空间分布格局及主控要素。结果表明：（1）潮滩分布的红树植物主要有桐花树、无瓣海桑等，其中桐花树为绝对优势种的“纯红树植物”群落，自河口向沿感潮河段逐渐发展成“红树植物—半红树植物”群落与“红树植物—半红树植物—非红树植物”的混合植物群落。（2）桐花树是钦江河口红树林向海发育的前沿先锋树种，二年生桐花树苗分布最前沿高程低于当地海平面0.11 m，当年胎生苗分布最前沿高程为当地海平面以下0.37 m；桐花树也是钦江感潮段上溯分布极限的树种，当年胎生苗上溯分布极限为距河口10.18 km。（3）潮位与盐度是控制红树林群落在钦江河口分布的主要因子，沉积物粒径的粗细影响红树植物生长与发育。研究成果可为热带山区型河口潮滩红树林保护与红树林生态修复工程提供重要理论和技术指导。
Abstract
Mangrove community is a special ecosystem along tropical and subtropical estuaries. It has important values in attenuating large waves
promoting silting
and storing carbon. However
due to the global sea level rise and human disturbances
mangrove habitats have been destroyed with fragile community structures. Therefore
based on the UAV orthophoto image with field verification
historical remote sensing images
water salinity
and sediment samples in tidal flats along the Qinjiang estuary
the spatial distribution patterns of mangrove community in the tidal flat and associated influence factors of the Qinjiang estuary were analyzed. The results are as follows: (1) Tidal flats of the Qinjiang estuary mainly consist of
A. corniculatum
and
S. apetala
where the “mangrove pure forest community”
with
A. corniculatum
is an absolutely dominant species in this area. Meanwhile
gradually developed patterns from “mangrove pure forest community” in the estuarine tidal flats are found in the combination of “mangrove plant–semi-mangrove plant” and “mangrove plant–semi-mangrove plant–non-mangrove plant” in the tidal reach. (2)
A. corniculatum
is the frontier pioneer tree species of the seaward grown mangroves in the Qinjiang estuary. The forefront elevation of the
A. corniculatum
biennial seedling distribution is 0.11 m below local sea level
and the forefront elevation of
A. corniculatum
viviparous seedling distribution is 0.37 m below local sea level. Meanwhile
the distributed limit of the mangroves in the upstream of the Qinjiang Estuary is
A. corniculatum
where the location of distribution limit in viviparous seedlings in that year is 10.18 km away from HS00 station. (3) The tidal water level and salinity of the Qinjiang estuary are the main driving factors for the distribution of mangrove communities
and the growth and development of mangrove plants were determined by the variations in grain size of sediments. These findings can provide theoretical and technical guidance for the present ecological restoration projects of mangrove communities in the mountainously tropical- estuaries of the world.
关键词
遥感红树林群落分布极限无人机正射影像河口潮滩钦江河口
Keywords
remote sensingmangrove communitydistribution of limitunmanned aerial vehicle orthoimageestuarine tidal flatQinjiang Estuary
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Qinzhou Key Laboratory for Eco-Restoration of Environment/ Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf,Beibu GulfUniversity
Aerospace Information Research Institute, Chinese Academy of Sciences
State Key Laboratory of Remote Sensing Science, Beijing Normal University
Beijing Engineering Research Center for Global Land Remote Sensing Products, Faculty of Geographical Science, Beijing Normal University
Institute of Remote Sensing Science and Engineering, Faculty of Geographical Science, Beijing Normal University
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