Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland

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Fältnamn	Indikatorer	Metadata
000		04210naa a2200469 4500
001		oai:DiVA.org:lnu-101675
003		SwePub
008		210326s2021 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-1016752 URI
024	7	a https://doi.org/10.1111/gcb.155432 DOI
040		a (SwePub)lnu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Warren, Jeffrey M.u Oak Ridge National Laboratory, USA4 aut
245	1 0	a Divergent species-specific impacts of whole ecosystem warming and elevated CO2 on vegetation water relations in an ombrotrophic peatland
264		c 2021-02-22
264	1	b John Wiley & Sons,c 2021
338		a print2 rdacarrier
520		a 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 assessed plant water relations of co-occurring shrub (primarily Rhododendron groenlandicum and Chamaedaphne calyculata) and tree (Picea mariana and Larix laricina) species prior to, and in response to whole ecosystem warming (0 to +9 degrees C) and elevated CO2 using 12.8-m diameter open-top enclosures installed within an ombrotrophic bog. Water relations (water potential [psi], turgor loss point, foliar and root hydraulic conductivity) were assessed prior to treatment initiation, then psi and peak sap flow (trees only) assessed after 1 or 2 years of treatments. Under the higher temperature treatments, L. laricina psi exceeded its turgor loss point, increased its peak sap flow, and was not able to recover psi overnight. In contrast, P. mariana operated below its turgor loss point and maintained constant psi and sap flow across warming treatments. Similarly, C. calyculata psi stress increased with temperature while R. groenlandicum psi remained at pretreatment levels. The more anisohydric behavior of L. laricina and C. calyculata may provide greater net C uptake with warming, while the more conservative P. mariana and R. groenlandicum maintained greater hydraulic safety. These latter species also responded to elevated CO2 by reduced psi stress, which may also help limit hydraulic failure during periods of extreme drought or heat in the future. Along with Sphagnum moss, the species-specific responses of peatland vascular communities to drier or hotter conditions will shape boreal peatland composition and function in the future.
650	7	a LANTBRUKSVETENSKAPERx Lantbruksvetenskap, skogsbruk och fiskex Skogsvetenskap0 (SwePub)401042 hsv//swe
650	7	a AGRICULTURAL SCIENCESx Agriculture, Forestry and Fisheriesx Forest Science0 (SwePub)401042 hsv//eng
653		a black spruce
653		a boreal forest
653		a climate change
653		a hydraulic stress
653		a sap flow
653		a water potential
653		a Forestry and Wood Technology
653		a Skog och träteknik
700	1	a Jensen, Anna M.,d 1978-u Linnéuniversitetet,Institutionen för skog och träteknik (SOT)4 aut0 (Swepub:lnu)anjeaa
700	1	a Ward, Eric J.u US Geological Survey, USA4 aut
700	1	a Guha, Anirbanu Oak Ridge National Laboratory, USA4 aut
700	1	a Childs, Joanneu Oak Ridge National Laboratory, USA4 aut
700	1	a Wullschleger, Stan D.u Oak Ridge National Laboratory, USA4 aut
700	1	a Hanson, Paul J.u Oak Ridge National Laboratory, USA4 aut
710	2	a Oak Ridge National Laboratory, USAb Institutionen för skog och träteknik (SOT)4 org
773	0	t Global Change Biologyd : John Wiley & Sonsg 27, s. 1820-1835q 27<1820-1835x 1354-1013x 1365-2486
856	4	u https://www.osti.gov/biblio/1779150
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-101675
856	4 8	u https://doi.org/10.1111/gcb.15543

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Av författaren/redakt...: Warren, Jeffrey ...; Jensen, Anna M., ...; Ward, Eric J.; Guha, Anirban; Childs, Joanne; Wullschleger, St ...; visa fler...; Hanson, Paul J.; visa färre...

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