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Title: Manipulative experiments demonstrate how long-term soil moisture changes alter controls of plant water use

Abstract

Tree transpiration depends on biotic and abiotic factors that might change in the future, including precipitation and soil moisture status. Although short-term sap flux responses to soil moisture and evaporative demand have been the subject of attention before, the relative sensitivity of sap flux to these two factors under long-term changes in soil moisture conditions has rarely been determined experimentally. We tested how long-term artificial change in soil moisture affects the sensitivity of tree-level sap flux to daily atmospheric vapor pressure deficit ( VPD) and soil moisture variations, and the generality of these effects across forest types and environments using four manipulative sites in mature forests. Exposure to relatively long-term (two to six years) soil moisture reduction decreases tree sap flux sensitivity to daily VPD and relative extractable water ( REW) variations, leading to lower sap flux even under high soil moisture and optimal VPD. Inversely, trees subjected to long-term irrigation showed a significant increase in their sensitivity to daily VPD and REW, but only at the most water-limited site. The ratio between the relative change in soil moisture manipulation and the relative change in sap flux sensitivity to VPD and REW variations was similar across sites suggesting common adjustmentmore » mechanisms to long-term soil moisture status across environments for evergreen tree species. Altogether, our results show that long-term changes in soil water availability, and subsequent adjustments to these novel conditions, could play a critical and increasingly important role in controlling forest water use in the future.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. CNRS, Montpellier Cedex (France)
  3. Australian National Univ., Canberra, ACT (Australia); Univ. of Edinburgh, Edinburgh (United Kingdom)
  4. ICREA, Barcelona (Spain); CREAF, Barcelona (Spain)
  5. Univ. of New Mexico, Albuquerque, NM (United States)
  6. Univ. of Edinburgh, Edinburgh (United Kingdom); Univ. of Helsinki, Helsinki (Finland)
  7. Swiss Federal Institute for Forest, Birmensdorf (Switzerland)
  8. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1415421
Alternate Identifier(s):
OSTI ID: 1416964; OSTI ID: 1479998; OSTI ID: 1529024
Report Number(s):
LA-UR-17-28179; PNNL-SA-131418; LA-UR-18-24942
Journal ID: ISSN 0098-8472
Grant/Contract Number:  
AC52-06NA25396; 0620482; NE/I011749/1; 1284701; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Environmental and Experimental Botany
Additional Journal Information:
Journal Volume: 152; Journal ID: ISSN 0098-8472
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 60 APPLIED LIFE SCIENCES; acclimation; climate change; drought; irrigation; sap flux; vapor pressure deficit; water use

Citation Formats

Grossiord, Charlotte, Sevanto, Sanna Annika, Limousin, Jean -Marc, Meir, Patrick, Mencuccini, Maurizio, Pangle, Robert E., Pockman, William T., Salmon, Yann, Zweifel, Roman, and McDowell, Nate G. Manipulative experiments demonstrate how long-term soil moisture changes alter controls of plant water use. United States: N. p., 2017. Web. doi:10.1016/j.envexpbot.2017.12.010.
Grossiord, Charlotte, Sevanto, Sanna Annika, Limousin, Jean -Marc, Meir, Patrick, Mencuccini, Maurizio, Pangle, Robert E., Pockman, William T., Salmon, Yann, Zweifel, Roman, & McDowell, Nate G. Manipulative experiments demonstrate how long-term soil moisture changes alter controls of plant water use. United States. doi:10.1016/j.envexpbot.2017.12.010.
Grossiord, Charlotte, Sevanto, Sanna Annika, Limousin, Jean -Marc, Meir, Patrick, Mencuccini, Maurizio, Pangle, Robert E., Pockman, William T., Salmon, Yann, Zweifel, Roman, and McDowell, Nate G. Thu . "Manipulative experiments demonstrate how long-term soil moisture changes alter controls of plant water use". United States. doi:10.1016/j.envexpbot.2017.12.010. https://www.osti.gov/servlets/purl/1415421.
@article{osti_1415421,
title = {Manipulative experiments demonstrate how long-term soil moisture changes alter controls of plant water use},
author = {Grossiord, Charlotte and Sevanto, Sanna Annika and Limousin, Jean -Marc and Meir, Patrick and Mencuccini, Maurizio and Pangle, Robert E. and Pockman, William T. and Salmon, Yann and Zweifel, Roman and McDowell, Nate G.},
abstractNote = {Tree transpiration depends on biotic and abiotic factors that might change in the future, including precipitation and soil moisture status. Although short-term sap flux responses to soil moisture and evaporative demand have been the subject of attention before, the relative sensitivity of sap flux to these two factors under long-term changes in soil moisture conditions has rarely been determined experimentally. We tested how long-term artificial change in soil moisture affects the sensitivity of tree-level sap flux to daily atmospheric vapor pressure deficit (VPD) and soil moisture variations, and the generality of these effects across forest types and environments using four manipulative sites in mature forests. Exposure to relatively long-term (two to six years) soil moisture reduction decreases tree sap flux sensitivity to daily VPD and relative extractable water (REW) variations, leading to lower sap flux even under high soil moisture and optimal VPD. Inversely, trees subjected to long-term irrigation showed a significant increase in their sensitivity to daily VPD and REW, but only at the most water-limited site. The ratio between the relative change in soil moisture manipulation and the relative change in sap flux sensitivity to VPD and REW variations was similar across sites suggesting common adjustment mechanisms to long-term soil moisture status across environments for evergreen tree species. Altogether, our results show that long-term changes in soil water availability, and subsequent adjustments to these novel conditions, could play a critical and increasingly important role in controlling forest water use in the future.},
doi = {10.1016/j.envexpbot.2017.12.010},
journal = {Environmental and Experimental Botany},
number = ,
volume = 152,
place = {United States},
year = {2017},
month = {12}
}

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Figures / Tables:

Figure 1 Figure 1: Hypothetical relationships between sap flux and daily soil moisture or vapor pressure deficit (VPD) variation under different long-term soil moisture conditions (high, medium and low soil moisture). The red arrow indicates changes in sap flux sensitivity to soil moisture and VPD resulting from physiological and possible structural adjustmentsmore » to soil moisture change (e.g. hydraulic resistance, stomatal density, synthesis of chemicals inducing stomatal closure, rooting depth). Because of adjustments to reduced soil moisture, trees would experience a decreased sensitivity to daily soil moisture and VPD variation inducing lower sap flux under both high and low soil moisture status, and lower maximum sap flux under optimal VPD. Sensitivity to soil moisture would thus be reflected through changes in the slope of the linear relationship between sap flux and soil moisture while changes in VPD sensitivity would be reflected in shifts of maximum sap flux at optimal VPD (location of the vertex of the curve). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)« less

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