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在新热带干森林中的门和替代状态,以应对火灾严重程度
H Raúl Peinetti1, Brandon T Bestelmeyer2, Claudia C Chirino1
1Facultad de Agronomía, Universidad Nacional de La Pampa, Santa Rosa, Argentina.
概括
严重的火灾可能会在卡尔登森林中造成不可逆转的转变,将它们转移到灌木. 放牧加剧了这种变化,可能会使生态系统陷入退化状态,影响对未来干扰的弹性.
科学领域:
- 生态生态学 生态生态学
- 火灾生态学 火灾生态学
- 植物生态学植物生态学
背景情况:
- 新热带植物性森林是随着火灾而演变的,但在当前的人为和气候变化的压力下,它们的弹性是不确定的.
- 对于突如其来的生态系统状态转换存在火灾严重度值是未知的.
研究的目的:
- 评估不同火灾严重性的中期 (11年) 影响,对一个异构的Caldén森林.
- 为了确定是否存在火灾严重度值,从而触发过渡到灌木茂密状态,考虑火灾后的管理.
主要方法:
- 在卡尔登森林的火灾严重程度低,中,高的区域进行植被调查.
- 分析卫星图像以量化火灾严重程度 (dNBR) 并绘制火灾前的天花板覆盖面.
主要成果:
- 高火灾严重程度的地区显示,地下树木覆盖面和植物密度增加,主要是重新生长的灌木和新建设施.
- 较低和中等火灾严重程度的地区与较高火灾严重程度相比,保持了较高的木质树冠覆盖率.
- 确定了火灾严重程度值 (dNBR> ~600),表明突然过渡到灌木密的状态.
结论:
- 卡尔登森林可以抵御中度至中度的火灾,但不能抵御高火灾.
- 火灾后的放牧和管理实践可能会在严重的野火之后促进灌木占主导地位.
- 重复的严重火灾和放牧可能会导致不可逆转的转移到灌木茂密状态,可能会困住生态系统.
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