2021
DOI: 10.1111/gcb.15543
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Divergent species‐specific impacts of whole ecosystem warming and elevated CO2on vegetation water relations in an ombrotrophic peatland

Abstract: Boreal peatland forests have relatively low species diversity and thus impacts of climate change on one or more dominant species could shift ecosystem function. Despite abundant soil water availability, shallowly rooted vascular plants within peatlands may not be able to meet foliar demand for water under drought or heat events that increase vapor pressure deficits while reducing near surface water availability, although concurrent increases in atmospheric CO2 could buffer resultant hydraulic stress. We assess… Show more

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Cited by 15 publications
(17 citation statements)
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References 86 publications
(129 reference statements)
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“…Taken together, these data show that tamarack exhibited more anisohydric behavior, with weak stomatal regulation in response to warming, increasing VPD and changes in the water table depth generating more negative water potentials, while black spruce showed more isohydric behavior (Sullivan et al, 2017;Warren et al, 2021). The branch-level data in Warren et al (2021) are also consistent with sap-flux results from SPRUCE, which show greater stimulations of tree-level water use with warming in tamarack than in spruce (Figure 5 in Warren et al, 2021), which imply that the leaf level responses in stomatal conductance are consistent with tree level water use patterns. While our findings contrast with earlier sap-flux based attributions of the isohydricity of these two species (Pappas et al, 2018), our data imply that black spruce regulates its stomata to prioritize hydraulic safety under warmer and high VPD air conditions over the ability to fix extra CO 2 .…”
Section: Discussionmentioning
confidence: 65%
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“…Taken together, these data show that tamarack exhibited more anisohydric behavior, with weak stomatal regulation in response to warming, increasing VPD and changes in the water table depth generating more negative water potentials, while black spruce showed more isohydric behavior (Sullivan et al, 2017;Warren et al, 2021). The branch-level data in Warren et al (2021) are also consistent with sap-flux results from SPRUCE, which show greater stimulations of tree-level water use with warming in tamarack than in spruce (Figure 5 in Warren et al, 2021), which imply that the leaf level responses in stomatal conductance are consistent with tree level water use patterns. While our findings contrast with earlier sap-flux based attributions of the isohydricity of these two species (Pappas et al, 2018), our data imply that black spruce regulates its stomata to prioritize hydraulic safety under warmer and high VPD air conditions over the ability to fix extra CO 2 .…”
Section: Discussionmentioning
confidence: 65%
“…In 2016, these differences in stomatal responses were also reflected in differences in branch water potential, where spruce maintained a relatively constant branch water potential throughout the growing season, while branch water potentials declined in tamarack in August when the water table depth increased (Table S3 in Warren et al, 2021). Taken together, these data show that tamarack exhibited more anisohydric behavior, with weak stomatal regulation in response to warming, increasing VPD and changes in the water table depth generating more negative water potentials, while black spruce showed more isohydric behavior (Sullivan et al, 2017;Warren et al, 2021).…”
Section: Discussionmentioning
confidence: 99%
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“…Experimental data on eCO 2 impacts during more severe, long‐lasting droughts, or droughts combined with heatwaves – conditions that may generate mortality in the field – remain rare (but see Warren et al ., 2011b, 2021). Most eCO 2 field studies have addressed the potential for system‐wide water savings under mild or moderate drought conditions.…”
Section: Severe Drought and Drought Mortalitymentioning
confidence: 99%