Long‐term forest resilience to climate change indicated by mortality, regeneration, and growth in semiarid southern Siberia
Long‐term forest resilience to climate change indicated by mortality, regeneration, and growth in semiarid southern Siberia
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DOI：
10.1111/gcb.13582
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发表时间：
2017-06
影响因子：
11.6
通讯作者：
Chongyang Xu;Hongyan Liu;O. Anenkhonov;A. Korolyuk;D. Sandanov;L. Balsanova;B. B. Naidanov-B.;Xiuchen Wu
中科院分区：
文献类型：
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作者：
Chongyang Xu;Hongyan Liu;O. Anenkhonov;A. Korolyuk;D. Sandanov;L. Balsanova;B. B. Naidanov-B.;Xiuchen Wu
一些研究表明，区域气候变暖和由此造成的干旱压力增加，导致半干旱森林中树木死亡率增加，对区域和全球碳固存产生了不可避免的影响。虽然气候变暖预计将持续到未来，但研究半干旱森林对气候变化的长期适应能力的研究有限。在这项研究中，长期森林恢复力被定义为森林补充补偿死亡损失的能力。我们观察到一个明显的变化，在长期的森林恢复力沿着当地的干旱梯度重建树木生长趋势和干扰的历史，并调查在西伯利亚南部的半干旱森林干扰后更新。在我们的研究中，随着当地干旱程度的增加，森林变得容易受到干旱胁迫的影响，再生首先加速，然后停止。1900-2012年，中度干旱地区的树木径向生长也相对稳定。此外，我们发现，较小的森林斑块总是有相对较弱的恢复力在相同的气候条件下。我们的研究结果意味着一个相对较高的弹性在干旱林线森林斑块比连续的森林，然而，进一步的气候变暖和干旱的增加可能会导致周围的干旱树线的小森林斑块的消失。这项研究揭示了气候变化的适应，并提供了管理脆弱的半干旱森林的见解。
Several studies have documented that regional climate warming and the resulting increase in drought stress have triggered increased tree mortality in semiarid forests with unavoidable impacts on regional and global carbon sequestration. Although climate warming is projected to continue into the future, studies examining long‐term resilience of semiarid forests against climate change are limited. In this study, long‐term forest resilience was defined as the capacity of forest recruitment to compensate for losses from mortality. We observed an obvious change in long‐term forest resilience along a local aridity gradient by reconstructing tree growth trend and disturbance history and investigating postdisturbance regeneration in semiarid forests in southern Siberia. In our study, with increased severity of local aridity, forests became vulnerable to drought stress, and regeneration first accelerated and then ceased. Radial growth of trees during 1900–2012 was also relatively stable on the moderately arid site. Furthermore, we found that smaller forest patches always have relatively weaker resilience under the same climatic conditions. Our results imply a relatively higher resilience in arid timberline forest patches than in continuous forests; however, further climate warming and increased drought could possibly cause the disappearance of small forest patches around the arid tree line. This study sheds light on climate change adaptation and provides insight into managing vulnerable semiarid forests.