| 现行黄河口保护区典型湿地植被时空动态遥感监测 |
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| 引用本文： | 张晨宇,陈沈良,李鹏,刘清兰.现行黄河口保护区典型湿地植被时空动态遥感监测[J].海洋学报,2022,44(1):125-136. |
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| 作者姓名： | 张晨宇 陈沈良 李鹏 刘清兰 |
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| 作者单位： | 华东师范大学 河口海岸学国家重点实验室，上海 200241 |
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| 基金项目： | 国家自然科学基金(U1706214);国家重点研发计划(2017YFC0405503)。 |
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| 摘 要： | 滩涂植被是滨海湿地的重要组成部分，其动态变化影响着湿地生态系统的结构和功能。利用遥感技术监测和评估湿地植被的长期变化对于海岸带资源管理和生态保护具有重要意义。本文以多时相Landsat卫星影像为数据源，结合面向对象和随机森林算法实现现行黄河口保护区内典型湿地植被的精准分类，揭示了2000?2020年研究区内芦苇、盐地碱蓬和互花米草的时空变化特征。经验证，湿地植被制图的总体精度为84.74%～92.39%，Kappa系数为0.81～0.91。长时序的分类结果表明，芦苇是现行黄河口保护区内的优势物种，分布面积占比维持在6%以上且总体保持平稳增长；盐地碱蓬面积自2006年开始呈减少趋势，优势度不断减小且破碎化程度严重。互花米草由2002年的221.85 hm2增加到2020年的5267.79 hm2，其扩张过程可分为3个阶段:2008年以前为扩张初期，互花米草生长不稳定；2008?2014年为快速扩张阶段，年平均扩展率为54%，空间上表现为向海扩张侵占光滩和向陆扩张侵占碱蓬生境；2014年至今为缓慢增长阶段，进入生长的稳定期，年平均扩展率仅为9%。
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| 关 键 词： | 现行黄河口 湿地植被 时空变化 面向对象 随机森林 |
| 收稿时间： | 2021-04-12 |
Spatiotemporal dynamic remote sensing monitoring of typical wetland vegetation in the Current Huanghe River Estuary Reserve |
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| Zhang Chenyu,Chen Shenliang,Li Peng,Liu Qinglan.Spatiotemporal dynamic remote sensing monitoring of typical wetland vegetation in the Current Huanghe River Estuary Reserve[J].Acta Oceanologica Sinica (in Chinese),2022,44(1):125-136. |
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| Authors: | Zhang Chenyu Chen Shenliang Li Peng Liu Qinglan |
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| Affiliation: | State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China |
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| Abstract: | The wetland vegetation is an important part of coastal wetlands, and its dynamic changes affect the structures and functions of wetland ecosystem. Therefore, it is of great significance to monitor and evaluate the long-term changes of wetland vegetation by remote sensing technology for the management of coastal resources and ecological protection. In this paper, we used multi-temporal Landsat satellite images as data sources, combined object-oriented method and random forest algorithm to achieve accurate classification of typical wetland vegetation in the Current Huanghe River Estuary Reserve, and revealed the spatiotemporal variation characteristics of Phragmites australis, Suaeda salsa and Spartina alterniflora in the study area from 2000 to 2020. It has been verified that the overall accuracy of wetland vegetation mapping is between 84.74% and 92.39%, and the Kappa coefficient is between 0.81 and 0.91. The results of long time series classification show that Phragmites australis is the dominant species in the Current Huanghe Estuary Reserve, and its distribution area is maintained at more than 6% and the overall growth is steady. The area of Suaeda salsa shows a decreasing trend since 2006. The dominance degree of Suaeda salsa is decreasing continuously and the degree of fragmentation is severe. The area of Spartina alterniflora increased year by year from 211.85 hm2 in 2002 to 5267.79 hm2 in 2020. The expansion process of Spartina alterniflora in the reserve could be divided into three stages: in the initial expansion period before 2008, the growth of Spartina alterniflora was unstable; from 2008 to 2014, there was a rapid expansion stage, with an average annual expansion rate of 54%, which showed that the seaward expansion invaded the plain and the landward expansion invaded the habitat of Suaeda salsa in space; since 2014, Spartina alterniflora has been growing slowly, entering a stable growth period, and the annual average expansion rate is only 9%. |
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| Keywords: | Current Huanghe River Estuary wetland vegetation spatiotemporal variation object-oriented random forest |
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