描述景观配置对东方杉芽虫侵袭动态的影响
Tommaso Trotto1, Nicholas C Coops1, Alexis Achim2
1Department of Forest Resources Management, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4 Canada.
Landscape ecology
|August 29, 2025
概括
有较小,分散的针叶树的碎片森林景观增加了杉虫 (SBW) 侵袭的风险. 景观配置指标,如斑块大小和形状,是SBW爆发的关键驱动因素,为森林管理策略提供信息.
科学领域:
- 森林管理
- 生态学
- 遥感技术
背景情况:
- 杉叶虫 (SBW) 是北美主要的森林除叶虫.
- 这种影响与宿主物种的可用性和景观配置有关.
- 长距离的SBW散布表明景观结构影响了虫的成功.
研究的目的:
- 为了测试碎片化的景观促进SBW感染的假设.
- 调查景观配置在调节SBW脱叶中的作用.
- 确定SBW感染概率及其演变的驱动因素.
主要方法:
- 在北克东部使用了13年的陆地卫星图像和森林资源库存数据.
- 抽取的景观配置指标 (面积,聚合,形状) 对于针叶树块.
- 使用随机森林模型根据配置指标估计感染概率.
主要成果:
- 较高的针叶树块碎片化与增加的SBW感染风险相关.
- 高风险的关键指标包括小,可变的补丁大小 (<40公),低景观补丁指数 (<50%),高凝聚力 (>97%) 和复杂的形状.
- 景观补丁指数显著影响了SBW感染.
结论:
- 自由使用的Landsat数据可以有效地提取空间分析的配置指标.
- 基于模型的概率估计突出了高风险的景观配置.
- 这些发现有助于森林管理,减少针叶树种群的碎片化和感染风险.
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