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Liana and tree below-ground water competition : evidence for water resource partitioning during the dry season

(2018) TREE PHYSIOLOGY. 38(7). p.1071-1083
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TREECLIMBERS (Modelling lianas as key drivers of tropical forest responses to climate change)
Abstract
To date, reasons for the increase in liana abundance and biomass in the Neotropics are still unclear. One proposed hypothesis suggests that lianas, in comparison with trees, are more adaptable to drought conditions. Moreover, previous studies have assumed that lianas have a deeper root system, which provides access to deeper soil layers, thereby making them less susceptible to drought stress. The dual stable water isotope approach (delta O-18 and d delta H-2) enables below-ground vegetation competition for water to be studied. Based on the occurrence of a natural gradient in soil water isotopic signatures, with enriched signatures in shallow soil relative to deep soil, the origin of vegetation water sources can be derived. Our study was performed on canopy trees and lianas reaching canopy level in tropical forests of French Guiana. Our results show liana xylem water isotopic signatures to be enriched in heavy isotopes in comparison with those from trees, indicating differences in water source depths and a more superficial root activity for lianas during the dry season. This enables them to efficiently capture dry season precipitation. Our study does not support the liana deep root water extraction hypothesis. Additionally, we provide new insights into water competition between tropical canopy lianas and trees. Results suggest that this competition is mitigated during the dry season due to water resource partitioning.
Keywords
lianas, soil water competition, stable water isotopes, tropical forest, water resource partitioning, STABLE-ISOTOPE COMPOSITION, RAIN-FOREST TREES, SOIL-WATER, TROPICAL FOREST, HYDROGEN ISOTOPES, GLOBAL PATTERNS, FRENCH-GUIANA, LEAF TRAITS, PLANTS, DEPTH

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Citation

Please use this url to cite or link to this publication:

Chicago
De Deurwaerder, Hannes, Pedro Hervé-Fernández, Clément Stahl, Benoit Burban, Pascal Petronelli, Bruce Hoffman, Damien Bonal, Pascal Boeckx, and Hans Verbeeck. 2018. “Liana and Tree Below-ground Water Competition : Evidence for Water Resource Partitioning During the Dry Season.” Tree Physiology 38 (7): 1071–1083.
APA
De Deurwaerder, H., Hervé-Fernández, P., Stahl, C., Burban, B., Petronelli, P., Hoffman, B., Bonal, D., et al. (2018). Liana and tree below-ground water competition : evidence for water resource partitioning during the dry season. TREE PHYSIOLOGY, 38(7), 1071–1083.
Vancouver
1.
De Deurwaerder H, Hervé-Fernández P, Stahl C, Burban B, Petronelli P, Hoffman B, et al. Liana and tree below-ground water competition : evidence for water resource partitioning during the dry season. TREE PHYSIOLOGY. 2018;38(7):1071–83.
MLA
De Deurwaerder, Hannes, Pedro Hervé-Fernández, Clément Stahl, et al. “Liana and Tree Below-ground Water Competition : Evidence for Water Resource Partitioning During the Dry Season.” TREE PHYSIOLOGY 38.7 (2018): 1071–1083. Print.
@article{8552898,
  abstract     = {To date, reasons for the increase in liana abundance and biomass in the Neotropics are still unclear. One proposed hypothesis suggests that lianas, in comparison with trees, are more adaptable to drought conditions. Moreover, previous studies have assumed that lianas have a deeper root system, which provides access to deeper soil layers, thereby making them less susceptible to drought stress. The dual stable water isotope approach (delta O-18 and d delta H-2) enables below-ground vegetation competition for water to be studied. Based on the occurrence of a natural gradient in soil water isotopic signatures, with enriched signatures in shallow soil relative to deep soil, the origin of vegetation water sources can be derived. Our study was performed on canopy trees and lianas reaching canopy level in tropical forests of French Guiana. Our results show liana xylem water isotopic signatures to be enriched in heavy isotopes in comparison with those from trees, indicating differences in water source depths and a more superficial root activity for lianas during the dry season. This enables them to efficiently capture dry season precipitation. Our study does not support the liana deep root water extraction hypothesis. Additionally, we provide new insights into water competition between tropical canopy lianas and trees. Results suggest that this competition is mitigated during the dry season due to water resource partitioning.},
  author       = {De Deurwaerder, Hannes and Herv{\'e}-Fern{\'a}ndez, Pedro and Stahl, Cl{\'e}ment and Burban, Benoit and Petronelli, Pascal and Hoffman, Bruce and Bonal, Damien and Boeckx, Pascal and Verbeeck, Hans},
  issn         = {0829-318X},
  journal      = {TREE PHYSIOLOGY},
  keyword      = {lianas,soil water competition,stable water isotopes,tropical forest,water resource partitioning,STABLE-ISOTOPE COMPOSITION,RAIN-FOREST TREES,SOIL-WATER,TROPICAL FOREST,HYDROGEN ISOTOPES,GLOBAL PATTERNS,FRENCH-GUIANA,LEAF TRAITS,PLANTS,DEPTH},
  language     = {eng},
  number       = {7},
  pages        = {1071--1083},
  title        = {Liana and tree below-ground water competition : evidence for water resource partitioning during the dry season},
  url          = {http://dx.doi.org/10.1093/treephys/tpy002},
  volume       = {38},
  year         = {2018},
}

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