摘要
海草盖度是反映海草床生态状况的重要指标。本文通过航拍方案设计和飞行条件试验采用无人机航拍获取了东郊椰林海域高分辨率海草影像图,结合ArcGIS软件影像分类工具和3D工具反演了海草分布范围,研究出海草盖度计算的新方法并计算了东郊椰林海底海草的盖度,模拟传统海草盖度调查方法的站点布置,探讨了其结果可比性和代表性问题。研究结果表明,东郊椰林海域海草主要分布于离岸300 m以内的珊瑚礁砰上,呈斑块状、间隔式分布,获取东郊椰林沿岸海草集中分布区面积为23221 m^(2),占研究区面积的比例为17.79%;海草覆盖面积约为16423 m^(2),海草盖度为12.58%,海草盖度较高,海草床生态状况良好。在研究区的东南区域有马尾藻密集分布,分布面积为755.6 m^(2),其盖度为0.5%,呈独株圆柱状漂浮生长。通过模拟试验,传统海草盖度调查方法有样框法和样线法,布置站点不同,样框、样线放置有随机性,海草盖度调查结果变动明显,是传统调查方法的结果存在代表性差、可比性差的原因。本研究成果在海草生态监控区调查中具有推广应用价值。
Seagrass coverage ratio is an important indicator reflecting the ecological status of seagrass beds.In this paper,through the design of aerial photography scheme and flight condition test,the high-resolution seagrass image map of the Dongjiao Coconut Forest sea area was obtained by using UAV aerial photography.Combined with the image classification tools of ArcGIS software and 3D tools,a new method for calculating the coverage ratio of seagrass were obtained and the coverage of seagrass was calculated.The station location of simulating survey method of the traditional seagrass coverage ratio was compared and discussed.Seagrasses in the coastal sea bed of the Dongjiao Coconut Forest are distributed on the coral reefs within 300 m from the shore with patches and intervals.Using the new method,the concentrated distribution area of seagrass at sea bed of the Dongjiao Coconut Forest is about 23221 m^(2),and average concentration distribution ratio is 17.79%.The distribution area of seagrass in this study area is about 16423 m^(2),and the coverage ratio of seagrass is 12.58%.The coverage ratio of seagrass is high-er,and the ecological condition of seagrass bed is good.Sargassum is densely distributed in the southeast area of the study area,with a distribution area of 755.6 m^(2)and a coverage of 0.5%,and grows as a single cylinder floating.By simulating the investigation station location of the sample frame method and sample line method of traditional seagrass coverage survey,seagrass coverage ratio changes with different stations,sample frame,and sample line positions changing randomly,which is the reason for the representativeness and comparability of the traditional sur-vey results.The research results of this project have the promotion and application value in the investigation of seagrass ecological monitoring area.
作者
蔡绍孟
陈春华
刘建波
宋长伟
Cai Shaomeng;Chen Chunhua;Liu Jianbo;Song Changwei(College of Ecology and Environment,Hainan Tropical Ocean University,Sanya 572022,China;Hainan Academy of Ocean and Fisheries Sciences,Haikou 571126,China;Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2023年第7期183-194,共12页
基金
海南省重点研发计划社会发展项目(ZDYF2023SHFZ143)
海南省重点研发计划高新技术项目(ZDYF2020022)。
关键词
无人机航测
东郊椰林
海草盖度
最大似然法
Iso聚类非监督分类
UAV aerial photography
Dongjiao Coconut Forest
seagrass coverage ratio
maximum likelihood method
in-teractive self-organization
