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禁火区可以增强火灾后树木的再生吗? 在亚山针叶树林中的模拟研究
Timon T Keller1, Diane C Abendroth2, Kristin H Braziunas3,4
1Department of Integrative Biology, University of Wisconsin-Madison, Madison, Wisconsin, USA.
概括
建立模仿历史燃烧模式的禁火区,可以显著促进面临气候变化和新型火灾制度的易受火灾影响的针叶树林的再生. 这一战略通过保护亚山和恩格尔曼杉等物种的种子来源来支持森林的弹性.
科学领域:
- 森林生态 森林生态
- 适应气候变化 适应气候变化
- 消防管理 消防管理
背景情况:
- 气候变化和火灾管理的变化威胁着历史上适应罕见,严重火灾的针叶树林.
- 新的火灾制度可能会破坏自然的火灾后再生过程,影响森林的弹性.
- 火灾管理策略在促进森林适应未来火灾条件方面的有效性仍然不确定.
研究的目的:
- 调查火灾禁区如何模拟历史火灾马赛克,影响大泰顿国家公园的针叶树林的火灾后树木再生.
- 评估禁火区的数量和配置对各种气候情景下的再生的影响.
- 评估"运营"的禁火区在21世纪末的景观层面再生方面的有效性.
主要方法:
- 利用基于个人的森林模拟模型iLand来探索火灾后再生动态.
- 进行了因数模拟,改变了禁火区的数量 (10-50%) 和配置 (分散与聚集).
- 开发并测试了基于物流消防考虑和模拟再生的操作场景,与参考场景相比,在四种气候场景 (温湿,热湿,温干,热干) 下模拟再生.
主要成果:
- 避免火灾的针叶树 (Abies lasiocarpa,Picea engelmannii) 的再生在禁火区中始终更高,特别是在≥30%的分散区域中.
- 禁火区对热火 (Pinus contorta) 和耐火 (Pseudotsuga menziesii) 种类的影响很小.
- 在操作场景中,防火物种的再生明显高 (高达10倍) 于参考场景,特别是在炎热的气候条件下,尽管整个世纪总体下降.
结论:
- 通过防火区模仿历史的燃烧马赛克,可以为针叶树林提供重要的种子来源.
- 这种管理方法为亚山针叶树林提供了至关重要的时间来适应火灾频率增加和气候变暖.
- 防火区是加强森林抗火能力的可行策略,以应对新型火灾制度和气候变化.
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