Abstract
The non-native mangrove species, Sonneratia apetala, was widely planted in coastal restoration projects of China in the past three decades, and dispersed in mangrove habitats in some introduction areas, which aroused wide attention from scientists and forest managers. Therefore, it is an urgent need to investigate their distributing patterns and build a dataset with basic information for natural mangrove conservation and restoration. The techniques combined field survey and visual interpretation based on sub-meter spatial resolution imagery from Google Earth (GE). The results showed that the boundary of stable S. apetala populations was ranged from 18°15′ N to 25°36′ N, with a total area of 3,804.86 ha in China in 2020. Guangdong had the largest distribution area of 3,217.34 ha, accounting for 84.56% of the total S. apetala populations in China, within which Zhanjiang (20°35'-21°30' N) took the largest amount. The spatial distribution of S. apetala in China followed the following three characteristics, 1) S. apetala was concentrated in the mid-latitude region (20°00'-23°00' N) of the southeast coast of China, especially along the coasts of Leizhou Bay (20°35'-21°30' N) in Guangdong; 2) S. apetala populations were commonly found in the middle to low tidal zones and at the seaward edges of native mangroves; 3) the dispersal S. apetala populations were found along rivers, tidal creeks, and other water systems, which also concentrated in estuaries or bays with freshwater inflow, on the coastal zones with low salinity, and in bare mudflat or low-shading forest edges, and forest gaps as well.
摘要
外来红树植物无瓣海桑 (Sonneratia apetala) 在过去30年被广泛应用于中国滨海湿地的修复工程, 并在引种区周边的天然红树林中发生扩散, 引起学者和管理者的关注。因此, 探寻无瓣海桑在中国的分布现状和规律十分迫切, 将为中国红树林的保护和恢复提供数据支撑。本研究旨在通过谷歌地球 (Google Earth) 亚米级分辨率遥感影像的目视解译, 结合实地调查, 获得无瓣海桑在中国的分布现状与规律。研究结果表明: 1. 截止2020年, 中国无瓣海桑稳定种群分布的北界为福建省莆田市仙游县 (25°36′N), 南界为海南省三亚市 (18°15′N), 分布面积达到3365.9 hm2; 广东省分布面积为3217.34 hm2, 占该物种全国分布面积的84.56%, 其在广东湛江市的分布面积最大。2. 无瓣海桑在中国的空间分布主要遵循以下三个特征: (1) 集中分布在东南沿海的中纬度地区 (20°00'-23°00' N), 特别是广东省雷州湾沿岸 (20°35'-21°30' N); (2) 常分布在中潮带和低潮带, 即乡土红树林的向海一侧外缘; (3) 呈现沿河流、水道、潮沟等水系分布的特点, 集中于有淡水汇入的河口湾区以及低盐的河口沿岸区域, 且多发现于无遮光的光滩或低遮光的林缘及林窗区域。
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The data will be available upon request to the corresponding author.
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Acknowledgements
We thank Zhangjiangkou National Mangrove Nature Reserve, Guangdong Neilingding-Futian National Nature Reserve, Zhanjiang Mangrove National Nature Reserve, Dongzhaigang National Nature Reserve, and Guangxi Mangrove Research Center for their support and permission in conducting field surveys. We are also very grateful to Dr. Luojia Hu for her valuable revisions to the manuscript and Prof. Hsing-Juh Lin for his confirmation of the distribution of S. apetala in Taiwan.
Funding
This work was supported by the National Natural Science Foundation Grant of China (42076176, 41771095), Natural Science Foundation of Fujian Province (2020J01048), Scientific and Technological Research Project for Social Welfare of Zhongshan City (2019B2005); Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (SML2020SP004), Science and Technology Basic Resources Investigation Program of China [No. 2017FY100704], Science and Technology Fund Program of Beihai [No.201995027] and University Innovation Foundation of Guangdong Province (2019KTSCX213).
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Luzhen Chen and Jialin Zhang contributed to the study conception and design. Data collection and analysis were performed by Jialin Zhang, Qiulian Lin and Yun Zhang. The first draft of the manuscript was written by Jialin Zhang and Luzhen Chen. Yisheng Peng, Lianghao Pan, and Yan Chen helped improve the accuracy of the data. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Zhang, J., Lin, Q., Peng, Y. et al. Distributions of the Non-Native Mangrove Sonneratia apetala in China: Based on Google Earth Imagery and Field Survey. Wetlands 42, 35 (2022). https://doi.org/10.1007/s13157-022-01556-4
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DOI: https://doi.org/10.1007/s13157-022-01556-4