热带稀树草原树木内部茎干损伤建模:利用陆地激光扫描和测算法计算地上生物量的误差

IF 6.3 2区 环境科学与生态学 Q1 ECOLOGY Methods in Ecology and Evolution Pub Date : 2024-06-26 DOI:10.1111/2041-210X.14375
Jed Calvert, Abbey R. Yatsko, Judy Bresgi, Alexander W. Cheesman, Keith Cook, James Crowe, Indigo Gambold, Caleb Jones, Liam O'Connor, Tony Peter, Pedro Russell-Smith, Elisha Taylor, Blair Trigger, Baptiste Wijas, Amy E. Zanne
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引用次数: 0

摘要

森林和林地是重要的陆地碳储存库。树木的地上生物量(AGB)可通过异速模型和陆地激光扫描(TLS)进行估算。然而,生物腐烂造成的树干内部损伤是 TLS 和等比线模型的一个尚未解决的误差来源,对准确的碳评估具有影响。我们对澳大利亚热带稀树草原上的 63 棵 TLS 扫描树木进行了破坏性采伐,通过在多个高度的横截面取样量化了每棵树的内部损伤,并模拟了损伤对单棵树木 AGB 估值和总生物量估算的影响。我们应用数据库和实地测量的木材比重,测试了 TLS AGB 建模与五种异构法的性能。对于 TLS 建模和异构 AGB 估算值,我们测试了树木大小和内部茎干损伤程度是否会导致 AGB 偏差。研究中约有一半的树木受到了1%-10%的体积损坏,损坏最严重的是基部和主干,然后逐渐向树冠扩展。受损树木的内部茎干受损率平均为 5%(按体积计算,SD = 6.65%),有些高达 30%。我们发现,使用现场测量的木材比重的 TLS 衍生定量结构模型(TLS-QSM)在估算总生物量方面最为准确(R2 = 0.99,偏差 +0.59%)。TLS-QSM往往会高估受损大树的AGB,而通过异速模型估算的AGB基本不受内部损伤的影响。对于单棵树木,所有方法都能有效预测实地测量的 AGB(R2 >0.84),几种 ASM 也表现良好(± ~10% 偏差)。在缺乏当地木材比重校准的情况下,泛热带 ASM 最为准确。对于内部茎干损伤程度较低(占树木体积的 10%)的系统,TLS 可用来估算 AGB,误差水平较低;但是,如果使用 TLS 而不校准损伤程度,则损伤程度较高的林木生态系统(占树木体积的 10%)可能会产生夸大的生物量估算值。应在 ASM 中量化内部茎干损伤,并将其纳入 TLS 模拟的 AGB 校正中,以避免生物量估计过高,并保持森林碳核算的高精度标准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Modelling internal stem damage in savanna trees: Error in aboveground biomass with terrestrial laser scanning and allometry

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来源期刊
CiteScore
11.60
自引率
3.00%
发文量
236
审稿时长
4-8 weeks
期刊介绍: A British Ecological Society journal, Methods in Ecology and Evolution (MEE) promotes the development of new methods in ecology and evolution, and facilitates their dissemination and uptake by the research community. MEE brings together papers from previously disparate sub-disciplines to provide a single forum for tracking methodological developments in all areas. MEE publishes methodological papers in any area of ecology and evolution, including: -Phylogenetic analysis -Statistical methods -Conservation & management -Theoretical methods -Practical methods, including lab and field -This list is not exhaustive, and we welcome enquiries about possible submissions. Methods are defined in the widest terms and may be analytical, practical or conceptual. A primary aim of the journal is to maximise the uptake of techniques by the community. We recognise that a major stumbling block in the uptake and application of new methods is the accessibility of methods. For example, users may need computer code, example applications or demonstrations of methods.
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