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

De Deurwaerder, Hannes; Herve-Fernandez, Pedro; Stahl, Clement; Burban, Benoit; Petronelli, Pascal; Hoffman, Bruce; Bonal, Damien; Boeckx, Pascal; Verbeeck, Hans

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.

Más información

Título según WOS: ID WOS:000439263300012 Not found in local WOS DB
Título de la Revista: TREE PHYSIOLOGY
Volumen: 38
Número: 7
Editorial: OXFORD UNIV PRESS
Fecha de publicación: 2018
Página de inicio: 1071
Página final: 1083
DOI:

10.1093/treephys/tpy002

Notas: ISI