Thompson Jonathan R, Spies Thomas A, Ganio Lisa M
Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA.
Proc Natl Acad Sci U S A. 2007 Jun 19;104(25):10743-8. doi: 10.1073/pnas.0700229104. Epub 2007 Jun 11.
Debate over the influence of postwildfire management on future fire severity is occurring in the absence of empirical studies. We used satellite data, government agency records, and aerial photography to examine a forest landscape in southwest Oregon that burned in 1987 and then was subject, in part, to salvage-logging and conifer planting before it reburned during the 2002 Biscuit Fire. Areas that burned severely in 1987 tended to reburn at high severity in 2002, after controlling for the influence of several topographical and biophysical covariates. Areas unaffected by the initial fire tended to burn at the lowest severities in 2002. Areas that were salvage-logged and planted after the initial fire burned more severely than comparable unmanaged areas, suggesting that fuel conditions in conifer plantations can increase fire severity despite removal of large woody fuels.
在缺乏实证研究的情况下，关于野火后管理对未来火灾严重程度的影响的争论正在进行。我们使用卫星数据、政府机构记录和航拍照片，研究了俄勒冈州西南部一片于1987年发生火灾的森林景观，该地区随后部分区域进行了伐除受害木作业并种植了针叶树，之后在2002年“饼干大火”期间再次燃烧。在控制了几个地形和生物物理协变量的影响后，1987年严重燃烧的区域在2002年往往再次发生高强度燃烧。未受初始火灾影响的区域在2002年的燃烧程度往往最低。初始火灾后进行了伐除受害木作业并种植树木的区域比未进行管理的类似区域燃烧得更严重，这表明针叶人工林中的燃料条件尽管去除了大型木质燃料，但仍可能增加火灾严重程度。
