Severe fire weather and intensive forest management increase fire severity in a multi-ownership landscape

Many studies have examined how fuels, topography, climate, and fire weather influence fire severity. Less is known about how different forest management practices influence fire severity in multi-owner landscapes, despite costly and controversial suppression of wildfires that do not acknowledge ownership boundaries. In 2013, the Douglas Complex burned over 19,000 ha of Oregon & California Railroad (O&C) lands in Southwestern Oregon, USA. O&C lands are comprised of a checkerboard of private industrial and federal forestland (Bureau of Land Management, BLM) with contrasting management objectives, providing a unique experimental landscape to understand how different management practices influence wildfire severity. Leveraging Landsat based estimates of fire severity (Relative differenced Normalized Burn Ratio, RdNBR) and geospatial data on fire progression, weather, topography, pre-fire forest conditions, and land ownership, we asked 1) what is the relative importance of di...诸多研究已围绕可燃物、地形、气候及火灾天气对火灾烈度的影响展开了深入探讨。然而，尽管针对无视权属边界的野火开展了成本高昂且颇具争议的灭火行动，但学界对多权属景观中不同森林经营措施如何影响火灾烈度的认知仍较为匮乏。2013年，美国俄勒冈州西南部的道格拉斯复合火场（Douglas Complex）过火面积逾19000公顷，烧毁了俄勒冈加利福尼亚铁路（Oregon & California Railroad, O&C）所辖的大片林地。O&C林地由交错分布的私有工业林与联邦所属林地（土地管理局，Bureau of Land Management, BLM）构成，二者经营目标迥异，为探究不同经营措施对野火烈度的影响提供了独具特色的实验性景观。本研究依托基于陆地卫星（Landsat）的火灾烈度估测数据（相对差值归一化燃烧比，Relative differenced Normalized Burn Ratio, RdNBR），以及野火蔓延、气象、地形、火前森林状况与土地权属等地理空间数据，旨在解答以下核心问题：1）各影响因子的相对重要性为……