Forest Drought Resistance at Large Geographic Scales
Forest Drought Resistance at Large Geographic Scales
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DOI：
10.1029/2018gl081108
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发表时间：
2019-03-16
影响因子：
5.2
通讯作者：
Asner, G. P.
中科院分区：
文献类型：
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作者：
Brodrick, P. G.;Anderegg, L. D. L.;Asner, G. P.
森林保护和碳封存的努力正在增加，但这些努力在气候变化下的长期稳定性仍然未知。我们产生了近三十年来整个加州的遥感树冠含水量，我们用它来确定干旱压力的模式。将这些干旱胁迫模式与气象变量联系起来，使我们能够在幅度和持续时间方面量化空间上明确的生物物理抗旱性。这些地图揭示了抗旱性的显著空间异质性，并表明几乎所有森林对严重、持续干旱的抵抗力都较弱。通过识别生物物理抗旱性的空间格局，我们量化了长期生态系统稳定性的一个重要组成部分，可用于森林保护、管理和政策决策。随着炎热干旱变得越来越频繁和严重，了解哪些森林处于危险之中，哪些森林有能力承受这些事件，对森林的长期管理非常重要。为了应对这一挑战，我们生成并分析了树冠含水率随时间变化的地图，并将其与气象学地图进行了比较。这一分析表明，在屈服于显著的冠层水分损失之前，一些地点能够承受更大的干旱，这表明抗旱性。我们的研究结果还强调，最近一次严重干旱的影响在干旱消退后仍持续多年。这些发现是评估面对气候变化的森林空间稳定性的重要的第一步。
Forest conservation and carbon sequestration efforts are on the rise, yet the long-term stability of these efforts under a changing climate remains unknown. We generate nearly three decades of remotely sensed canopy water content throughout California, which we use to determine patterns of drought stress. Linking these patterns of drought stress with meteorological variables enables us to quantify spatially explicit biophysical drought resistance in terms of magnitude and duration. These maps reveal significant spatial heterogeneity in drought resistance and demonstrate that almost all forests have less resistance to severe, persistent droughts. By identifying the spatial patterning of biophysical drought resistance, we quantify an important component of long-term ecosystem stability that can be used for forest conservation, management, and policy decisions.Plain Language Summary As hot droughts become more frequent and more severe, it is important for long-term forest management to understand which forests are at risk and which have the capacity to withstand these events. To address this challenge, we generated and analyzed maps of canopy water content through time and compared them to maps of meteorology. This analysis revealed that some locations were able to endure significantly more drought before succumbing to significant canopy water loss, which indicates drought resistance. Our findings also highlighted that the effects of a recent, severe drought have persisted multiple years after the drought subsided. These findings are an important first step toward assessing spatially explicit forest stability in the face of a changing climate.