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使用10米分辨率的卫星观测来绘制全球湖泊水生植被动态的地图

Xuejiao Hou¹, Jinying Liu², Huabing Huang¹

¹International Research Center of Big Data for Sustainable Development Goals, Beijing 100094, China; School of Geospatial Engineering and Science, Sun Yat-sen University, Guangzhou 510275, China; Key Laboratory of Comprehensive Observation of Polar Environment (Sun Yat-sen University), Ministry of Education, Zhuhai 519082, China.

Science bulletin

|June 21, 2024

概括

全球地图显示了全球超过81,000个湖泊的水生植被. 自20世纪80年代以来,大多数湖泊的植被都在下降,这凸显了需要进行保护工作的必要性.

科学领域:

环境科学环境科学
遥感遥感遥感遥感
生态生态学生态生态学

背景情况:

水生植被对湖泊健康至关重要,支持生物多样性和水质.
对水生植被的时空监测对于湖泊生态系统管理至关重要.
缺乏对水生植被分布的全面全球评估.

研究的目的:

开发一种自动化算法,利用卫星图像绘制全球水生植被分布图.
为首次对湖区水生植被动态进行全球评估.
分析全球水生植被变化的趋势和影响因素.

主要方法:

为 Sentinel-2 多谱仪器 (MSI) 数据开发了一种自动识别算法,准确度为 94.4%.
用1480万张卫星图像 (2019-2022) 绘制了全球140万个湖泊的水生植被分布图.
分析了历史数据,以评估170个湖泊的水生植被变化,从20世纪80年代初到2022年.

主要成果:

在六大洲的81,116个湖泊中确定了水生植被,累计最大面积为16,111.8平方公里.
全球平均水生植被发生率为3.0%,南美 (7.4%) 和非洲 (4.1%) 的比例更高.
72.4%的分析湖泊显示,从20世纪80年代初到2022年,水生植被下降,特别是在亚洲和非洲.

结论:

这项研究提供了第一个水生植被分布和动态的全球地图.
水生植被的显著减少凸显了迫切的保护需要.
湖泊的物理特征和周围环境是影响植被分布的关键因素,与开花和温度一起.

关键词:

水生植被的识别方法湖泊的湖泊湖泊的湖泊遥感是一种远程传感.哨兵-2 MSI 的时间表.植被的发生植被的发生

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