A climatic dipole drives short- and long-term patterns of postfire forest recovery in the western United States
A climatic dipole drives short- and long-term patterns of postfire forest recovery in the western United States
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气候偶极子驱动美国西部火灾后森林恢复的短期和长期模式
DOI：
10.1073/pnas.2007434117
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Davis, Kimberley T.
中科院分区：
文献类型：
--
作者：
Littlefield, Caitlin E.;Dobrowski, Solomon Z.;Abatzoglou, John T.;Parks, Sean A.;Davis, Kimberley T.
由于越来越担心气候变化和加剧的火灾将引发生态系统转变，研究人员越来越多地研究火灾后森林恢复的模式和驱动因素。种子供应减少和火灾后干旱已成为针叶树补充的主要限制因素。然而，气候变化的重复模式在多大程度上影响了火灾后恢复的模式，这一点在很大程度上仍未得到探索。在这里，我们确定了美国西部内陆地区年度气候水分亏缺异常的南北偶极子，并描述了其对森林火灾恢复的影响。我们使用每年从树木年代学记录中解析的建立模型来将这种气候偶极子与短期火灾后幼体的招募联系起来。我们还使用 989 个烧毁地块的森林清查和分析数据来研究长期恢复轨迹。我们表明，落基山脉北部（NR）和美国西南部（SW）每年火后黄松的补充概率与偶极子的强度有关，但由于干旱加剧而总体下降。这表明不同的恢复轨迹可能会在大空间尺度上同时触发：西南地区的有利条件可能对应于自然保护区的干旱，从而抑制黄松的生长，反之亦然。这种气候偶极子的印记在火灾发生后的多年里都很明显，在经历火灾后干旱的地区，幼年黄松存在的长期可能性降低就证明了这一点。这些发现强调了多个时空尺度的气候变化在推动跨区域森林恢复模式中的重要性，并对理解全球变化下的生态系统转变和物种范围动态具有重要意义。
Researchers are increasingly examining patterns and drivers of postfire forest recovery amid growing concern that climate change and intensifying fires will trigger ecosystem transformations. Diminished seed availability and postfire drought have emerged as key constraints on conifer recruitment. However, the spatial and temporal extent to which recurring modes of climatic variability shape patterns of postfire recovery remain largely unexplored. Here, we identify a north–south dipole in annual climatic moisture deficit anomalies across the Interior West of the US and characterize its influence on forest recovery from fire. We use annually resolved establishment models from dendrochronological records to correlate this climatic dipole with short-term postfire juvenile recruitment. We also examine longer-term recovery trajectories using Forest Inventory and Analysis data from 989 burned plots. We show that annual postfire ponderosa pine recruitment probabilities in the northern Rocky Mountains (NR) and the southwestern US (SW) track the strength of the dipole, while declining overall due to increasing aridity. This indicates that divergent recovery trajectories may be triggered concurrently across large spatial scales: favorable conditions in the SW can correspond to drought in the NR that inhibits ponderosa pine establishment, and vice versa. The imprint of this climatic dipole is manifest for years postfire, as evidenced by dampened long-term likelihoods of juvenile ponderosa pine presence in areas that experienced postfire drought. These findings underscore the importance of climatic variability at multiple spatiotemporal scales in driving cross-regional patterns of forest recovery and have implications for understanding ecosystem transformations and species range dynamics under global change.
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影响因子：
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作者：
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影响因子：
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作者：
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DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
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