在太平洋西部,美国的所有权之间,火灾后收获的长期模式不同
Aaron Zuspan1, Matthew J Reilly2, E Henry Lee3
1USDA Forest Service, Western Wildland Environmental Threat Assessment Center, Pacific Northwest Research Station, ORISE Fellow, 3200 SW Jefferson Way, Corvallis, OR 97331, United States of America.
概括
太平洋西部的私人和联邦土地上的火灾后收获 (PFH) 实践有很大的差异. 虽然联邦PFH率下降,但私营PFH率和补丁大小增加,特别是在较不严重的森林中.
科学领域:
- 林业林业 林业 林业 林业
- 生态生态学 生态生态学
- 保护科学 保护科学
背景情况:
- 消防后收获 (PFH) 是一种具有生态和经济影响的森林管理实践.
- 了解私人土地与公共土地的PFH趋势对于有效的森林管理至关重要,特别是随着野火活动的增加.
- 近几十年来,人们对美国西太平洋地区的PFH的范围和演变知之甚少.
研究的目的:
- 绘制和分析1986-2017年美国太平洋西部私人和联邦土地的火灾后收获 (PFH) 趋势.
- 为了比较所有权之间的PFH面积,率和补丁大小以及烧伤严重程度.
- 调查PFH实践如何在应对政策变化和越来越大的野火范围的过程中演变.
主要方法:
- 在加利福尼亚州,俄勒冈州和华盛顿州的220万公烧毁的森林土地上绘制PFH的地图.
- 时间序列干预分析,以比较PFH区域,速率和平均补丁大小的趋势.
- 在私人 (0.5万公) 和联邦 (1.6万公) 土地之间,以及不同程度的烧伤程度之间,对PFH实践的统计比较.
主要成果:
- 总体PFH率为8.0% (4.9%联邦,18.6%私人).
- 在20世纪90年代中期,PFH率和面积下降,然后随着烧毁面积的增加而反弹,其率仍然很低.
- 联邦PFH在1990年代后转向较低的率和较小的补丁,特别是在不太严重的烧伤地区;私人PFH率和补丁大小增加,特别是在低到中度严重的烧伤中.
结论:
- 31年来,太平洋西部的私有和联邦土地之间的收获实践有显著差异.
- 政策的转变,诉讼和越来越严重的野火影响了PFH趋势.
- 现在PFH在较大的火灾中更加分散,在不同的土地所有权上有不同的管理方法.
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