Pyrogeography across the western Palearctic: A diversity of fire regimes

We characterised fire regimes and estimated fire regime parameters (area burnt, size, intensity, season, patchiness, pyrodiversity) at broad spatial scales using remotely sensed individual-fire data. Specifically, we focused on the western part of the Palearctic realm, i.e., Europe, North Africa, and the Near East. We first divided the study area into eight large ecoregions based on their environment and vegetation (ecoregions): Mediterranean, Arid, Atlantic, Mountains, Boreal, Steppes, Continental, and Tundra. Then we intersected each ecoregion with individual-fire data obtained from remote sensing hotspots to estimate fire regime parameters for each environment. This allowed us to compute annual area burnt, fire size, fire intensity, fire season, fire patchiness, fire recurrence, and pyrodiversity for each ecoregion. We then related those fire parameters with the ecoregions’ climate and analysed the temporal trends in fire size. The results suggest that fire regime parameters vary acr...我们利用遥感获取的单火事件数据，在大空间尺度上表征了火灾制度（fire regime），并估算了火灾制度相关参数，包括过火面积、火势规模、火强度、起火季节、火斑块分布（fire patchiness）以及火多样性（pyrodiversity）。具体而言，本研究聚焦于古北界（Palearctic realm）西部区域，即欧洲、北非与近东地区。我们首先依据环境与植被特征，将研究区划分为8个大型生态区（ecoregions）：地中海区（Mediterranean）、干旱区（Arid）、大西洋区（Atlantic）、山地区（Mountains）、泰加林带（Boreal）、草原区（Steppes）、大陆性气候区（Continental）以及苔原区（Tundra）。随后，我们将每个生态区与遥感热点获取的单火事件数据进行空间叠加，以估算各生态区对应的火灾制度参数。借此我们得以计算每个生态区的年过火面积、火势规模、火强度、起火季节、火斑块分布、火复发频率（fire recurrence）以及火多样性。随后，我们将上述火灾参数与各生态区的气候数据进行关联分析，并探究了火势规模的时间演变趋势。研究结果表明，火灾制度参数存在差异……