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来自陆地激光扫描的新型树木高度测量方法揭示了与热带雨林森林库存方法的重大差异

Louise Terryn¹, Kim Calders¹, Félicien Meunier¹

¹Q-ForestLab, Department of Environment, Ghent University, Ghent, Belgium.

Global change biology

|August 19, 2024

概括

陆地激光扫描 (TLS) 揭示了传统树木高度 (H) 和直径 (D) 测量模型中碳库存估计所使用的显著低估值. 使用TLS数据的新型泛热带模型为热带雨林提供了更准确的预测.

科学领域:

生态生态学生态生态学
林业科学林业科学
遥感遥感遥感遥感

背景情况:

树木度模型对于估计陆地碳库存至关重要,它依赖于茎直径 (D) 和树木高度 (H) 的测量.
现有的全球数据库经常将各种方法的高度测量与不同的错误配置文件相结合,影响H:D全度测量的准确性.
陆地激光扫描 (TLS) 为测量树木结构提供了一种精确,非破坏性的方法.

研究的目的:

通过使用TLS数据,评估现有的基于森林库存的H:D测量对象的准确性.
为热带雨林开发改进的泛热带H:D全度模型,使用TLS测量.

主要方法:

从四大洲的19个热带雨林地块中收集了来自1951棵树的茎直径 (D) 和树高度 (H) 的TLS数据.
在11个地块中,比较了TLS衍生的H:D异位测量与来自传统森林库存数据的H:D异位测量.
开发了新的泛热带H:D全度模型,其中包含了最大气候学缺水.

主要成果:

与TLS测量相比,基于森林库存的H:D测量系统始终低估了树木高度 (H),某些地块的低估值高达41.3%.
新提出的基于TLS的泛热带H:D测量表现出平均不确定性为19.1%和平均偏差为-4.8%.
虽然不确定性略高于Chave2014模型,但新模型在树大小上提供了更一致的不确定性,并将高度偏差降低了8.23%.

结论:

传统森林库存高度测量的错误会对树木度模型和碳库存估计的准确性产生重大影响.
在热带雨林中,TLS技术为准确的树木结构测量提供了强大的解决方案,这对于完善全度模型至关重要.
开发的基于TLS的泛热带度学提供了一个更可靠的工具,用于估计热带森林中的生物质和碳储量.

关键词:

准确度准确度准确度准确度准确度进行森林库存.地上的激光扫描扫描.树木全量学是一种全量学.树的高度树的高度热带雨林热带雨林热带雨林

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