Apparent climatically induced increase of tree mortality rates in a temperate forest.
Apparent climatically induced increase of tree mortality rates in a temperate forest.
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DOI：
10.1111/j.1461-0248.2007.01080.x
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发表时间：
2007-10
期刊：
影响因子：
8.8
通讯作者：
Phillip J van Mantgem;N. Stephenson
中科院分区：
文献类型：
--
作者：
Phillip J van Mantgem;N. Stephenson
我们提供了第一个详细的分析，长期的，年度分辨率的人口趋势在温带森林。在追踪了加州的Sierra内华达州的一个古老森林网络中21,338棵树的命运后，我们发现，在22年的测量（1983-2004）中，死亡率而不是招募率显著增加。两个主要的分类群体（冷杉和松树）和不同的森林类型（不同的海拔带）的死亡率增加。总体死亡率的增加是由于压力和生物原因造成的树木死亡增加，与温度驱动的干旱指数增加相吻合。我们的研究结果表明，这些森林（以及其他水资源有限的森林）可能对温度驱动的干旱胁迫敏感，如果未来气候继续以气温上升为特征，而没有补偿降水增加，可能会出现枯死。
We provide a first detailed analysis of long-term, annual-resolution demographic trends in a temperate forest. After tracking the fates of 21,338 trees in a network of old-growth forest plots in the Sierra Nevada of California, we found that mortality rate, but not the recruitment rate, increased significantly over the 22 years of measurement (1983-2004). Mortality rates increased in both of two dominant taxonomic groups (Abies and Pinus) and in different forest types (different elevational zones). The increase in overall mortality rate resulted from an increase in tree deaths attributed to stress and biotic causes, and coincided with a temperature-driven increase in an index of drought. Our findings suggest that these forests (and by implication, other water-limited forests) may be sensitive to temperature-driven drought stress, and may be poised for die-back if future climates continue to feature rising temperatures without compensating increases in precipitation.