Salinity effects in Eucalyptus camaldulensis and Combretum quadrangulare: ecophysiological and morphological studies.

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Acta Forestalia Fennica. 1990. 214: 1-105.

Title: Salinity effects in Eucalyptus camaldulensis and Combretum quadrangulare: ecophysiological and morphological studies.
Alternative title: Suolaisuuden vaikutukset Eucalyptus camaldulensikseen ja Combretum quadrangulareen: ekofysiologisia ja morfologisia tutkimuksia.
Author: Luangjame, Jesada
Publisher: The Society of Forestry in Finland - The Finnish Forest Research Institute
Date: 1990
Language: en
ISSN: 0001-5636
Abstract: In a study of two salt-tolerant tree species, Combretum quadrangulare and Eucalyptus camaldulensis, results from a greenhouse experiment with NaCl salinity of 0, 0.5, 1.0, 1.5 and 2.0% were compared with those of a field study on non-saline and saline soils in north-eastern Thailand. Determination of optimum gas exchange and development and evaluation of photosynthetic models with and without water deficit were included. Shoot height and diameter growth, shoot internode length, root length/biomass, leaf width and length, leaf area, number and biomass, and shoot:root and leaf:root ratios decreased with salinity, while leaf thickness increased with salinity. More growth occurred in roots than in the leaf canopy. In the laboratory, photosynthesis, stomatal conductance and water potential decreased with salinity, while CO2 compensation point increased with salinity. Transpiration, dark respiration and photorespiration increased at low salinity but decreased at high salinity. In the field study, however, there were no significant differences in stomatal conductance and opening between saline and non-saline soils. Model predictions supported results of the field measurements. Adaptation of salinity was reflected in an acclimatization of tree structure in the field study. There were both functioning and structural changes of seedlings in the greenhouse experiment. In terms of ecophysiological and morphological characteristics, E. camaldulensis showed better salt tolerance than C. quadrangulare in both the greenhouse experiment and field study.
Subject: broadleaves,multipurpose trees, salt tolerance, trees, woody plants
Eucalyptus camaldulensis
Combretum quadrangulare

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