在北极混合木林中经过可变保留采摘后的碳动态
Linhao Wu1, J A Colin Bergeron1, S Ellen Macdonald1
1Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.
概括
在北极森林中的保留采摘可以保持碳储量,特别是在更高的保留水平. 这种方法提供了一种平衡木材生产与关键碳储存目标的实用方法.
科学领域:
- 林业科学 林业科学
- 生态生态学 生态生态学
- 气候变化缓解缓解 气候变化缓解
背景情况:
- 保留收获被提议作为清除砍伐的替代方案,以改善管理森林中的生态价值.
- 由于收获和干扰,北极森林的气候缓解能力正在下降,需要有效的森林管理策略.
- 为了平衡木材生产和碳储存,了解保留采伐的各种森林类型中的碳动态至关重要.
研究的目的:
- 为了比较碳池和动态在不同的保留收获水平和森林类型在18年的时间.
- 评估保留采伐在维护森林碳库存方面的有效性,与砍伐和未采伐森林相比.
- 评估森林类型 (树叶,针叶,混合) 在保留收获后对碳动态的影响.
主要方法:
- 在北极混合木林中进行长期实验研究 (收获前至收获后18年).
- 碳池 (活植物和死植物生物质) 在收获强度 (清除,10-75%的保留,未收获的参考) 之间进行比较.
- 分析的重点是生物质变化,因为土壤碳在研究规模上被发现是不变的.
主要成果:
- 收获后的净碳损失与所有森林类型的收获强度相比例.
- 保留收获通常会在收获后3-18年内产生比清除更大的碳储量.
- 最高的保留水平 (50-75%) 保持了碳储量,相当于一些类型的未经采伐的森林在采伐后18年.
- 落叶树木在3-7年内成为碳汇,而混合树木和针叶树木在收获后12-18年内保持近乎中性或是碳来源.
结论:
- 战略性保留采伐是将碳储存与其他森林管理目标相结合的可行选择.
- 更高的保留水平在保护碳储量方面更有效,特别是在针叶树和混合木种群中.
- 森林类型显著影响了收获后的碳动态,落叶树种群更快地回收碳.
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