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Title: Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris

Abstract

Nonstructural carbohydrates (NSCs) are important for the growth and survival of trees. Drought may lead to a decrease in tree growth and to NSC depletion, whereas increased soil moisture in otherwise dry ecosystems may increase growth and NSC concentrations. A long-term (13 yr) irrigation experiment was conducted in a Pinus sylvestris-dominated forest located at the dry margin of the species in southern Switzerland. We measured the relative leaf area, growth, NSCs, needle d13C, [N] and [P] in trees on control and irrigated plots. Irrigation resulted in higher growth rates and carbon isotope discrimination, but did not alter NSC levels. Growth and NSC decreased with decreasing leaf area in both treatments, but NSC did not correlate with leaf-level gas exchange indices, such as foliar d13C, [N] or [P]. A legacy effect was shown, as trees with initially low leaf area had limited ability to respond to prolonged irrigation. The NSC constancy across treatments provides evidence that carbohydrate storage may stay constant when climate changes are sufficiently slow to allow acclimation. Moreover, we speculate that total leaf area, rather than leaf gas exchange per unit leaf area, drives the variation in whole-tree carbohydrate dynamics in this system.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [6]
  1. Department of Environmental Sciences – Botany, University of Basel
  2. Swiss Federal Research Institute WSL
  3. University of Basel
  4. BATTELLE (PACIFIC NW LAB)
  5. Swiss Federal Institute for Forest, Snow and Landscape Research WSL
  6. Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1557803
Report Number(s):
PNNL-SA-135183
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
New Phytologist
Additional Journal Information:
Journal Volume: 219; Journal Issue: 4
Country of Publication:
United States
Language:
English

Citation Formats

Schonbeck, Leonie, Gessler, Arthur, Hoch, Gunter, McDowell, Nate G., Rigling, Andreas, Schaub, Marcus, and Li, Mai-He. Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris. United States: N. p., 2018. Web. doi:10.1111/nph.15224.
Schonbeck, Leonie, Gessler, Arthur, Hoch, Gunter, McDowell, Nate G., Rigling, Andreas, Schaub, Marcus, & Li, Mai-He. Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris. United States. doi:10.1111/nph.15224.
Schonbeck, Leonie, Gessler, Arthur, Hoch, Gunter, McDowell, Nate G., Rigling, Andreas, Schaub, Marcus, and Li, Mai-He. Sat . "Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris". United States. doi:10.1111/nph.15224.
@article{osti_1557803,
title = {Homeostatic levels of nonstructural carbohydrates after 13 yr of drought and irrigation in Pinus sylvestris},
author = {Schonbeck, Leonie and Gessler, Arthur and Hoch, Gunter and McDowell, Nate G. and Rigling, Andreas and Schaub, Marcus and Li, Mai-He},
abstractNote = {Nonstructural carbohydrates (NSCs) are important for the growth and survival of trees. Drought may lead to a decrease in tree growth and to NSC depletion, whereas increased soil moisture in otherwise dry ecosystems may increase growth and NSC concentrations. A long-term (13 yr) irrigation experiment was conducted in a Pinus sylvestris-dominated forest located at the dry margin of the species in southern Switzerland. We measured the relative leaf area, growth, NSCs, needle d13C, [N] and [P] in trees on control and irrigated plots. Irrigation resulted in higher growth rates and carbon isotope discrimination, but did not alter NSC levels. Growth and NSC decreased with decreasing leaf area in both treatments, but NSC did not correlate with leaf-level gas exchange indices, such as foliar d13C, [N] or [P]. A legacy effect was shown, as trees with initially low leaf area had limited ability to respond to prolonged irrigation. The NSC constancy across treatments provides evidence that carbohydrate storage may stay constant when climate changes are sufficiently slow to allow acclimation. Moreover, we speculate that total leaf area, rather than leaf gas exchange per unit leaf area, drives the variation in whole-tree carbohydrate dynamics in this system.},
doi = {10.1111/nph.15224},
journal = {New Phytologist},
number = 4,
volume = 219,
place = {United States},
year = {2018},
month = {9}
}

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