减少塞拉内华达山脉火灾危险的不同途径的碳成本
Yihong Zhu1, Daniel E Foster1, Brandon M Collins1,2
1Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, California, USA.
概括
恢复森林中经常发生火灾的模式可以降低野火风险,但也可以减少碳储存. 精细化和燃烧等密集处理甚至可能产生净碳来源,影响森林的弹性.
科学领域:
- 森林生态 森林生态
- 气候变化缓解缓解 气候变化缓解
- 干扰制度 干扰制度
背景情况:
- 对于美国西部的森林来说,频繁的火灾制度至关重要,但往往被压制.
- 森林火灾减轻策略,如规定的火灾和机械稀释,用于减少危险.
- 有关这些处理对森林碳储存的影响存在担忧.
研究的目的:
- 评估恢复干扰制度对碳动态的长期影响.
- 为了比较不同野火减缓处理的碳后果.
- 评估减少野火危险和塞拉内华达森林碳储存之间的权衡.
主要方法:
- 在塞拉内华达混合针叶树林中利用了长期的,复制的实地实验.
- 与未经处理的对照对照对照的经过处理的支架的碳动态 (稀释,口,规定的火) 的比较.
- 监测了19年的碳储存,生态系统净生产率 (NEP) 和植被/燃料回收.
主要成果:
- 所有经过处理的群体在19年后储存的碳比对照组少,在耐药池中储存的碳更多.
- 密集的稀释,和火灾处理在20年成为净碳来源.
- 与机械处理相比,控制和仅用火处理的净生态系统生产率更高.
- 活植物的碳积累在控制中停滞不前,但在仅用火处理中加速.
- 模拟野火导致对照组中树木死亡率更高,但对照组保持了火灾后更大的碳储存.
结论:
- 森林火灾缓解处理需要碳成本,密集方法可能会产生净碳来源.
- 恢复的消防制度可以增强活植物的碳积累,不一定会导致燃料的快速积累.
- 管理策略可以最大限度地减少减少野火危险和这些森林中碳储存之间的权衡.
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