Contrasting seasonal leaf habits of canopy trees between tropical dry-deciduous and evergreen forests in Thailand.
作者： A. Ishida , S. Diloksumpun , P. Ladpala , D. Staporn , S. Panuthai
DOI: 10.1093/TREEPHYS/26.5.643
关键词:
摘要: We compared differences in leaf properties, gas exchange and photochemical properties between drought-deciduous evergreen trees tropical dry forests, where soil nutrients differed but rainfall was similar. Three canopy (Shorea siamensis Miq., Xylia xylocarpa (Roxb.) W. Theob. Vitex peduncularis Wall. ex Schauer) a forest tree (Hopea ferrea Lanessan) an were selected. Soil nutrient availability is lower the than deciduous forest. Compared with tree, had shorter life spans, masses per area, higher mass-based nitrogen (N) contents, photosynthetic rates (mass-based P(n)), N-based P(n), daily maximum stomatal conductance (g(s)) wider conduits wood xylem. Mass-based P(n) decreased from wet to season for all species. Following onset of season, g(s) sensitivity leaf-to-air vapor pressure deficit remained relatively unchanged trees, whereas both during season. Photochemical capacity non-photochemical quenching (NPQ) photosystem II (PSII) also even after In contrast, NPQ increased indicating that leaves coped prolonged drought by down-regulating PSII. Thus, drought-avoidant species characterized high N allocation carbon assimilation, water use photoinhibition avoidance, drought-tolerant low conservative tolerance.
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