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首页> 外文期刊>Ecosystems >Disentangling the Influence of Past Fires on Subsequent Fires in Mediterranean Landscapes
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Disentangling the Influence of Past Fires on Subsequent Fires in Mediterranean Landscapes

机译：消防过去火灾对地中海景观的后期火灾的影响

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Understanding the interplay between climate, fuel and fire is necessary for developing strategies that minimize the negative impacts of fire on people and ecosystems. Here, we aim to investigate whether past fires limit fire activity by reducing fuel availability ('fire leverage') in Catalonia (NE Spain; 32,107 km(2)), a Mediterranean region encompassing diverse landscapes of agricultural plains and pine-oak mosaics. We built a hierarchical model to assess variations in annual burnt area in relation to weather, past fires and time for a 40-year period (1976-2015). The model also quantified how mean annual wind speed and the arrangement of forests modulated leverage. We found that the cumulated burnt area in the last 6-7 years reduced the re-occurrence of fires. Annual burnt area increased with both dry weather conditions and the number of hot days (>= 30 degrees C) and showed a moderate decline over the 40-year time series. Model outputs provided some evidence that landscapes with higher mean annual wind speed had lower fire leverage and landscapes with more continuous forest cover had higher fire leverage; however, the statistical uncertainty surrounding the effects of these two relationships was high. In summary, our results show that climate-fire relationships in Mediterranean landscapes are dynamic: fires create short-lived conditions where fuels limit future fire activity in fire regimes usually limited by weather. Our work highlights the multiple factors regulating leverage and helps to understand the interplay between climate, vegetation and recurrent fires in shaping fire regimes.
机译：了解气候，燃料和火灾之间的相互作用是制定最小化火灾对人和生态系统的负面影响的策略所必需的。在这里，我们的目的是通过减少加泰罗尼亚（NE西班牙的燃料可用性（'火杠杆'），调查过去的火灾是否限制了消防活动我们建立了一个分层模型，以评估与20年期间的天气，过去的火灾和时间相关的年度燃烧区域的变化（1976-2015）。该模型还量化了年度风速和森林排列调制杠杆的平均值。我们发现，过去6 - 7年的累积烧焦区域减少了火灾的重新发生。每年烧焦地区随着恶劣天气条件和炎热天数（> = 30摄氏度）而增加，并且在40年的时间序列中显示出中度下降。模型输出提供了一些证据，即年度风速较高的景观较高的火杠杆和景观更加连续的森林覆盖率较高的火杠杆;然而，围绕这两个关系的效果的统计不确定性很高。总之，我们的结果表明，地中海景观中的气候消防关系是动态：火灾创造短暂的条件，燃料限制未来在消防制度中的消防活动通常受天气限制。我们的工作突出了调节杠杆的多种因素，并有助于了解气候，植被和复发性燃烧之间的相互作用。

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