模拟挪威杉树环碳和氧同位素对干燥的泥炭地森林选择性收获的反应

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Olli-Pekka Tikkasalo¹, Kersti Leppä¹, Samuli Launiainen¹

¹Natural Resources Institute Finland (LUKE), Latokartanonkaari 9, FI-00790 Helsinki, Finland.

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|September 27, 2023

概括

持续覆盖林业 (CCF) 选择性收获可以使被压制的挪威杉树受益. 在CCF中建模CCF.

科学领域:

林业科学林业科学
植物生理学植物生理学
生态系统建模生态系统建模

背景情况:

连续覆盖林业 (CCF) 是对年龄均等管理的替代方案,特别是在干旱的泥炭地森林中.
在CCF中抑制树木对选择性采摘的生理反应尚不清楚.
对树木对选择采摘的反应的过程级建模是罕见的.

研究的目的:

为了比较和建模被抑制的挪威杉 (Picea abies) 树对选择性收获的生理反应.
用树圈中稳定的碳和氧同位素来量化收获反应.
将测量结果与生态系统级过程模型预测进行比较.

主要方法:

从一个被排水的泥炭林中收集了挪威杉树的树环样本.
在2010-20年 (包括收获后的五年) 形成的木材中测量了稳定碳 (13C) 和氧 (18O) 同位素比率.
与生态系统级工艺模型预测13C歧视和18O叶子水丰富的测量同位素比率进行比较,包括灵敏度分析.

主要成果:

生态系统模型预测了类似的,但较低的收获反应,而不是通过同位素分析测量.
为准确建模13C歧视,对中粒细胞导电性的考虑至关重要.
模型灵敏度分析表明,对13C的区分受到控制二氧化碳转移到美索菲尔的参数的高度影响.

结论:

根据同位素分析,在CCF中进行的精选采摘对被抑制的挪威杉产生了积极的影响.
生态系统过程模型可以捕捉收获反应,但需要改进,特别是在介质细胞导电性方面.
准确的二氧化碳运输建模对于了解树木对森林管理实践的生理反应至关重要.

关键词:

皮切亚树 (Picea abies) 是一个树木.生态系统模型生态系统模型

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