当前位置: X-MOL 学术Nat. Geosci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A satellite-derived baseline of photosynthetic life across Antarctica
Nature Geoscience ( IF 15.7 ) Pub Date : 2024-08-06 , DOI: 10.1038/s41561-024-01492-4
Charlotte V. Walshaw , Andrew Gray , Peter T. Fretwell , Peter Convey , Matthew P. Davey , Joanne S. Johnson , Claudia Colesie

Terrestrial vegetation communities across Antarctica are characteristically sparse, presenting a challenge for mapping their occurrence using remote sensing at the continent scale. At present there is no continent-wide baseline record of Antarctic vegetation, and large-scale area estimates remain unquantified. With local vegetation distribution shifts now apparent and further predicted in response to environmental change across Antarctica, it is critical to establish a baseline to document these changes. Here we present a 10 m-resolution map of photosynthetic life in terrestrial and cryospheric habitats across the entire Antarctic continent, maritime archipelagos and islands south of 60° S. Using Sentinel-2 imagery (2017–2023) and spectral indices, we detected terrestrial green vegetation (vascular plants, bryophytes, green algae) and lichens across ice-free areas, and cryospheric green snow algae across coastal snowpacks. The detected vegetation occupies a total area of 44.2 km2, with over half contained in the South Shetland Islands, altogether contributing just 0.12% of the total ice-free area included in the analysis. Due to methodological constraints, dark-coloured lichens and cyanobacterial mats were excluded from the study. This vegetation map improves the geospatial data available for vegetation across Antarctica, and provides a tool for future conservation planning and large-scale biogeographic assessments.



中文翻译:


来自卫星的南极洲光合生命基线



南极洲的陆地植被群落特征稀疏,这给利用遥感在大陆尺度上绘制其分布地图带来了挑战。目前,南极植被没有全大陆的基线记录,大范围的面积估计仍然没有量化。由于南极洲各地的环境变化,当地植被分布的变化现已明显并进一步预测,因此建立记录这些变化的基线至关重要。在这里,我们展示了整个南极大陆、南纬 60° 以南的海洋群岛和岛屿的陆地和冰冻圈栖息地的 10 米分辨率光合生命地图。使用 Sentinel-2 图像(2017-2023)和光谱指数,我们检测到了陆地和冰冻圈栖息地的光合生命。无冰地区的绿色植被(维管植物、苔藓植物、绿藻)和地衣,以及沿海积雪的冰冻圈绿色雪藻。检测到的植被总面积为44.2 km 2 ,其中一半以上位于南设得兰群岛,仅占分析中无冰总面积的0.12%。由于方法学的限制,深色地衣和蓝藻垫被排除在研究之外。该植被地图改进了整个南极洲植被的可用地理空间数据,并为未来的保护规划和大规模生物地理评估提供了工具。

更新日期:2024-08-06
down
wechat
bug