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Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics
C. Grossiord, B. Christoffersen, AM. Alonso-Rodríguez, K. Anderson-Teixeira, H. Asbjornsen, LMT. Aparecido, Z. Carter Berry, C. Baraloto, D. Bonal, I. Borrego, B. Burban, JQ. Chambers, DS. Christianson, M. Detto, B. Faybishenko, CG. Fontes, C....
Jazyk angličtina Země Německo
Typ dokumentu časopisecké články
Grantová podpora
DE-SC-0011806
Office of Science
5231.00639.001.01
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
NLK
ProQuest Central
od 2003-01-01 do Před 1 rokem
Medline Complete (EBSCOhost)
od 2000-01-01 do Před 1 rokem
Health & Medicine (ProQuest)
od 2003-01-01 do Před 1 rokem
- MeSH
- lesy MeSH
- období sucha MeSH
- stromy * MeSH
- tlak par MeSH
- transpirace rostlin * MeSH
- voda MeSH
- Publikační typ
- časopisecké články MeSH
Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime [mean annual precipitation (MAP); seasonal drought intensity (PDRY)] and two functional traits related to foliar and wood economics spectra [leaf mass per area (LMA); wood specific gravity (WSG)]. We show that, even though vmax is highly variable within sites, it follows a negative trend in response to increasing MAP and PDRY across sites. LMA and WSG exerted little effect on vmax and VPDmax, suggesting that these widely used functional traits provide limited explanatory power of dynamic plant responses to environmental variation within hyper-diverse forests. This study demonstrates that long-term precipitation plays an important role in the sap flux response of humid tropical forests to VPD. Our findings suggest that under higher evaporative demand, trees growing in wetter environments in humid tropical regions may be subjected to reduced water exchange with the atmosphere relative to trees growing in drier climates.
Climate and Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA
Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA USA
Department of Biology University of Maryland College Park MD USA
Department of Ecosystem Science and Management Texas A and M University College Station TX USA
Department of Geography University of California Berkeley CA USA
Department of Integrative Biology University of California Berkeley Berkeley CA 94720 3140 USA
Department of Natural Resources and the Environment University of New Hampshire Durham NH 03824 USA
Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos NM USA
Earth Systems Science Division Pacific Northwest National Laboratory Richland WA USA
Instituto Nacional de Pesquisas da Amazônia Manaus Brazil
Schmid College of Science and Technology Chapman University Orange CA USA
Université de Lorraine AgroParisTech INRA UMR Silva Nancy 54000 France
Zachry Department of Civil Engineering Texas A and M University 3136 TAMU College Station TX USA
Citace poskytuje Crossref.org
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- $a Grossiord, Charlotte $u Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, Birmensdorf, 8903, Switzerland. charlotte.grossiord@wsl.ch. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA. charlotte.grossiord@wsl.ch.
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- $a Precipitation mediates sap flux sensitivity to evaporative demand in the neotropics / $c C. Grossiord, B. Christoffersen, AM. Alonso-Rodríguez, K. Anderson-Teixeira, H. Asbjornsen, LMT. Aparecido, Z. Carter Berry, C. Baraloto, D. Bonal, I. Borrego, B. Burban, JQ. Chambers, DS. Christianson, M. Detto, B. Faybishenko, CG. Fontes, C. Fortunel, BO. Gimenez, KJ. Jardine, L. Kueppers, GR. Miller, GW. Moore, R. Negron-Juarez, C. Stahl, NG. Swenson, V. Trotsiuk, C. Varadharajan, JM. Warren, BT. Wolfe, L. Wei, TE. Wood, C. Xu, NG. McDowell,
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- $a Transpiration in humid tropical forests modulates the global water cycle and is a key driver of climate regulation. Yet, our understanding of how tropical trees regulate sap flux in response to climate variability remains elusive. With a progressively warming climate, atmospheric evaporative demand [i.e., vapor pressure deficit (VPD)] will be increasingly important for plant functioning, becoming the major control of plant water use in the twenty-first century. Using measurements in 34 tree species at seven sites across a precipitation gradient in the neotropics, we determined how the maximum sap flux velocity (vmax) and the VPD threshold at which vmax is reached (VPDmax) vary with precipitation regime [mean annual precipitation (MAP); seasonal drought intensity (PDRY)] and two functional traits related to foliar and wood economics spectra [leaf mass per area (LMA); wood specific gravity (WSG)]. We show that, even though vmax is highly variable within sites, it follows a negative trend in response to increasing MAP and PDRY across sites. LMA and WSG exerted little effect on vmax and VPDmax, suggesting that these widely used functional traits provide limited explanatory power of dynamic plant responses to environmental variation within hyper-diverse forests. This study demonstrates that long-term precipitation plays an important role in the sap flux response of humid tropical forests to VPD. Our findings suggest that under higher evaporative demand, trees growing in wetter environments in humid tropical regions may be subjected to reduced water exchange with the atmosphere relative to trees growing in drier climates.
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