Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 541114
Title Transpiration and stomatal conductance in a young secondary tropical montane forest : Contrasts between native trees and invasive understorey shrubs
Author(s) Ghimire, Chandra Prasad; Bruijnzeel, L.A.; Lubczynski, Maciek W.; Zwartendijk, Bob W.; Odongo, Vincent Omondi; Ravelona, Maafaka; Meerveld, H.J. van
Source Tree Physiology 38 (2018)7. - ISSN 0829-318X - p. 1053 - 1070.
DOI https://doi.org/10.1093/treephys/tpy004
Department(s) Water Resources Management
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Lantana camara - Psiadia altissima - Rubus moluccanus - Sap flow - Stomatal control - Tropical forest regeneration
Abstract

It has been suggFested 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.

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