Journal Article

Contrasting seasonal leaf habits of canopy trees between tropical dry-deciduous and evergreen forests in Thailand

Atsushi Ishida, Sapit Diloksumpun, Phanumard Ladpala, Duriya Staporn, Samreong Panuthai, Minoru Gamo, Kenichi Yazaki, Moriyoshi Ishizuka and Ladawan Puangchit

in Tree Physiology

Volume 26, issue 5, pages 643-656
Published in print May 2006 | ISSN: 0829-318X
Published online May 2006 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/26.5.643
Contrasting seasonal leaf habits of canopy trees between tropical dry-deciduous and evergreen forests in Thailand

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We compared differences in leaf properties, leaf gas exchange and photochemical properties between drought-deciduous and evergreen trees in tropical dry forests, where soil nutrients differed but rainfall was similar. Three canopy trees (Shorea siamensis Miq., Xylia xylocarpa (Roxb.) W. Theob. and Vitex peduncularis Wall. ex Schauer) in a drought-deciduous forest and a canopy tree (Hopea ferrea Lanessan) in an evergreen forest were selected. Soil nutrient availability is lower in the evergreen forest than in the deciduous forest. Compared with the evergreen tree, the deciduous trees had shorter leaf life spans, lower leaf masses per area, higher leaf mass-based nitrogen (N) contents, higher leaf mass-based photosynthetic rates (mass-based Pn), higher leaf N-based Pn, higher daily maximum stomatal conductance (gs) and wider conduits in wood xylem. Mass-based Pn decreased from the wet to the dry season for all species. Following onset of the dry season, daily maximum gs and sensitivity of gs to leaf-to-air vapor pressure deficit remained relatively unchanged in the deciduous trees, whereas both properties decreased in the evergreen tree during the dry season. Photochemical capacity and non-photochemical quenching (NPQ) of photosystem II (PSII) also remained relatively unchanged in the deciduous trees even after the onset of the dry season. In contrast, photochemical capacity decreased and NPQ increased in the evergreen tree during the dry season, indicating that the leaves coped with prolonged drought by down-regulating PSII. Thus, the drought-avoidant deciduous species were characterized by high N allocation for leaf carbon assimilation, high water use and photoinhibition avoidance, whereas the drought-tolerant evergreen was characterized by low N allocation for leaf carbon assimilation, conservative water use and photoinhibition tolerance.

Keywords: chlorophyll fluorescence; dry season; leaf mass per area; photosynthesis; stomatal response; strategy; tropical monsoon forest; xylem vessel

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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