Weather underground : Subsurface hydrologic processes mediate tree vulnerability to extreme climatic drought

© 2020 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 26(2020), 5 vom: 11. Mai, Seite 3091-3107
1. Verfasser: McLaughlin, Blair C (VerfasserIn)
Weitere Verfasser: Blakey, Rachel, Weitz, Andrew P, Feng, Xue, Brown, Brittni J, Ackerly, David D, Dawson, Todd E, Thompson, Sally E
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Quercus douglasii climate change drought hydrologic niche hydrology lithology oak woodlands subsurface water
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520 |a Drought extent and severity have increased and are predicted to continue to increase in many parts of the world. Understanding tree vulnerability to drought at both individual and species levels is key to ongoing forest management and preparation for future transitions in community composition. The influence of subsurface hydrologic processes is particularly important in water-limited ecosystems, and is an under-studied aspect of tree drought vulnerability. With California's 2013-2016 extraordinary drought as a natural experiment, we studied four co-occurring woodland tree species, blue oak (Quercus douglasii), valley oak (Quercus lobata), gray pine (Pinus sabiniana), and California juniper (Juniperus californica), examining drought vulnerability as a function of climate, lithology and hydrology using regional aerial dieback surveys and site-scale field surveys. We found that in addition to climatic drought severity (i.e., rainfall), subsurface processes explained variation in drought vulnerability within and across species at both scales. Regionally for blue oak, severity of dieback was related to the bedrock lithology, with higher mortality on igneous and metamorphic substrates, and to regional reductions in groundwater. At the site scale, access to deep subsurface water, evidenced by stem water stable isotope composition, was related to canopy condition across all species. Along hillslope gradients, channel locations supported similar environments in terms of water stress across a wide climatic gradient, indicating that subsurface hydrology mediates species' experience of drought, and that areas associated with persistent access to subsurface hydrologic resources may provide important refugia at species' xeric range edges. Despite this persistent overall influence of the subsurface environment, individual species showed markedly different response patterns. We argue that hydrologic niche segregation can be a useful lens through which to interpret these differences in vulnerability to climatic drought and climate change 
650 4 |a Journal Article 
650 4 |a Quercus douglasii 
650 4 |a climate change 
650 4 |a drought 
650 4 |a hydrologic niche 
650 4 |a hydrology 
650 4 |a lithology 
650 4 |a oak woodlands 
650 4 |a subsurface 
650 4 |a water 
700 1 |a Blakey, Rachel  |e verfasserin  |4 aut 
700 1 |a Weitz, Andrew P  |e verfasserin  |4 aut 
700 1 |a Feng, Xue  |e verfasserin  |4 aut 
700 1 |a Brown, Brittni J  |e verfasserin  |4 aut 
700 1 |a Ackerly, David D  |e verfasserin  |4 aut 
700 1 |a Dawson, Todd E  |e verfasserin  |4 aut 
700 1 |a Thompson, Sally E  |e verfasserin  |4 aut 
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773 1 8 |g volume:26  |g year:2020  |g number:5  |g day:11  |g month:05  |g pages:3091-3107 
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