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Using Multi-Platform LiDAR to Guide the Conservation of the World's Largest Temperate Woodland

REMOTE SENSING OF ENVIRONMENT(2023)

Univ Bristol

Cited 13|Views32
Abstract
Australia's Great Western Woodlands are the largest intact temperate woodland ecosystem on Earth, spanning an area the size of the average European country. These woodlands are part of one of the world's biodiversity hotspots and, despite subsisting on just 200-400 mm of rainfall a year, can store considerable amounts of carbon. However, they face growing pressure from a combination of climate change and increasingly frequent and large wildfires, which have burned over a third of these slow-growing, fire-sensitive woodlands in last 50 years alone. To develop conservation strategies that bolster the long-term resilience of this unique ecosystem, we urgently need to understand how much old-growth woodland habitat remains intact and where it is distributed across this vast region. To tackle this challenge, we brought together data from an extensive network of field plots distributed across the region and combined this with information on vegetation 3D structure derived from drone, airborne and spaceborne LiDAR. Using this unique dataset, we developed a novel modelling framework to generate the first high-resolution maps of woodland tree size and age structure across the entire region. We found that 41.2% of the woodland habitat is covered by old-growth stands, equivalent to an area of approximately 39,187 km2. Only 10% of these old-growth woodlands fall within current protected areas managed by the state government. Instead, most remaining old-growth woodlands are found either within the Ngadju Indigenous Protected Area (26.9%) or outside of formal protected areas on leaseholds and privately owned lands (57.2%). Our maps of woodland size and age structure will help guide the targeted management and conservation of the Great Western Woodlands. Moreover, by developing a robust pipeline for integrating LiDAR data from multiple platforms, our study paves the way for mapping the 3D structure and carbon storage of open and heterogeneous woodland ecosystems from space.
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Key words
Canopy structure,Conservation prioritization,Ecosystem restoration,GEDI,Great Western Woodlands,LiDAR,Old -growth woodlands,Remote sensing,Wildfires
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要点】:本研究利用多平台LiDAR技术,首次生成澳大利亚大西部树林的高分辨率树大小和年龄结构地图,为该生态系统的保护提供了重要数据和创新模型。

方法】:研究结合了地面调查数据与无人机、航空和卫星LiDAR获取的植被三维结构信息,开发了一种新的建模框架。

实验】:通过分析该地区广泛分布的地面样方数据,结合多平台LiDAR数据,研究发现41.2%的树林覆盖为老龄林,相当于约39,187平方公里,其中仅有10%的老龄树林位于政府管理的保护区内。