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火灾后的结构性森林恢复与干旱的亚 boreal 森林的气候极端相关
Sarah Smith-Tripp1,2, Nicholas Coops1, Christopher Mulverhill1
1Department of Forest Resources Management, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC Canada.
概括
火灾后的极端气候,特别是寒冷和干燥的夏季,对北美西部的针叶树林恢复产生了重大影响. 森林管理策略必须适应这些不断变化的气候条件,才能成功地重新造林.
科学领域:
- 生态生态学 生态生态学
- 林业林业 林业 林业 林业
- 气候科学 气候科学
背景情况:
- 大型,严重的野火在北美西部的针叶树林中越来越常见.
- 火灾后的恢复受到干旱等频繁的极端气候现象的挑战.
- 了解针叶树林再生的生态驱动因素至关重要.
研究的目的:
- 在景观规模 (>40万公) 上,研究森林火灾后明显的森林恢复模式与生态驱动因素之间的关联.
- 确定影响干旱亚boreal森林野火后针叶覆盖和密度趋势的关键因素.
主要方法:
- 利用Landsat时间序列数据来识别光谱恢复模式.
- 用户远程驾驶飞机 (RPA) 光探测和距离测量 (lidar) 用于结构恢复估计 (5-21年火灾后).
- 使用随机森林,模拟结构恢复组与生态驱动因素 (现场条件,气候,气候异常,火灾前组成,火灾影响) 之间的关联.
主要成果:
- 气候异常 (火灾后的温度和极端降水) 和火灾前的基底面积是结构恢复的最强有力的预测因素.
- 火灾后的寒冷和干燥的夏季与较慢的针叶树的建立有关.
- 较高的火灾前基底面积与持续的叶落树和针叶树干的混合树冠相关.
结论:
- 火灾后的气候条件是景观尺度上森林结构恢复的主要决定因素.
- 燃烧森林的管理计划必须能够适应火灾后的气候条件,以实现有效的复林.
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