Journal article
Transpiration and stomatal conductance in a young secondary tropical montane forest: contrasts between native trees and invasive understorey shrubs
Tree Physiology, Vol.38(7), pp.1053-1070
2018
Abstract
It has been suggested that vigorous secondary tropical forests can have very high transpiration rates, but sap flow and stomatal conductance dynamics of trees and shrubs in these forests are understudied. In an effort to address this knowledge gap, sap flow (thermal dissipation method, 12 trees) and stomatal conductance (porometry, six trees) were measured for young (5-7 years) Psiadia altissima (DC.) Drake trees, a widely occurring species dominating young regrowth following abandonment of swidden agriculture in upland eastern Madagascar. In addition, stomatal conductance (gs) was determined for three individuals of two locally common invasive shrubs (Lantana camara L. and Rubus moluccanus L.) during three periods with contrasting soil moisture conditions. Values of gs for the three investigated species were significantly higher and more sensitive to climatic conditions during the wet period compared with the dry period. Further, gs of the understorey shrubs was much more sensitive to soil moisture content than that of the trees. Tree transpiration rates (Ec) were relatively stable during the dry season and were only affected somewhat by soil water content at the end of the dry season, suggesting the trees had continued access to soil water despite drying out of the topsoil. The Ec exhibited a plateau-shaped relation with vapour pressure deficit (VPD), which was attributed to stomatal closure at high VPD. Vapour pressure deficit was the major driver of variation in Ec, during both the wet and the dry season. Overall water use of the trees was modest, possibly reflecting low site fertility after three swidden cultivation cycles. The observed contrast in gs response to soil water and climatic conditions for the trees and shrubs underscores the need to take root distributions into account when modelling transpiration from regenerating tropical forests.
Details
- Title
- Transpiration and stomatal conductance in a young secondary tropical montane forest: contrasts between native trees and invasive understorey shrubs
- Authors
- Chandra Prasad Ghimire (Author) - University of Twente, NetherlandsL Adrian Bruijnzeel (Author) - University of the Sunshine CoastMaciek W Lubczynski (Author) - University of Twente, NetherlandsBob W Zwartendijk (Author) - University of Zurich, SwitzerlandVincent Omondi Odongo (Author) - Egerton University, KenyaMaafaka Ravelona (Author) - University of Antananarivo, MadagascarH J van Meerveld (Corresponding Author) - University of Zurich, Switzerland
- Publication details
- Tree Physiology, Vol.38(7), pp.1053-1070
- Publisher
- Oxford University Press
- DOI
- 10.1093/treephys/tpy004
- ISSN
- 0829-318X
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99450723802621
- Output Type
- Journal article
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- Forestry
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Source: InCites