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--></style><title>Dry times challenge sustainability of the familiar
aspen</title></head><body>
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color="#141413">Here, we examine the physiological basis of a recent
multiyear widespread die-off of trembling aspen (Populus tremuloides)
across much of western North America. Š. We test whether
accumulated hydraulic damage can predict the probability of tree
survival over 2 years. We find that hydraulic damage persisted and
increased in dying trees over multiple years and exhibited few signs
of repair Š. Contrary to the expectation that surviving
trees have weathered severe drought, the hydraulic deterioration
demonstrated here reveals that surviving regions of these forests are
actually more vulnerable to future droughts due to accumulated xylem
damage."</font><br>
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<div><font face="Lucida Grande" size="-1" color="#141413">WILLIAM R.
L. ANDEREGG et al. Drought's legacy: multiyear hydraulic deterioration
underlies widespread aspen forest die-off and portends increased
future risk. Global Change Biology (2013) 19, 1188-1196, doi:
10.1111/gcb.12100</font></div>
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