哥伦比亚波哥大条件下两种安第斯森林对比种小檗和月桂的生态生理研究

Sara L. Colmenares-Trejos, L. Melgarejo, A. Romero
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引用次数: 4

摘要

在波哥大,研究了高安第斯森林对比植物——阴兼性日光植物桃金娘(Myrcianthes leucoxyla)和日光植物小檗(Abatia parviflora)在旱季到雨季过渡期间的生理反应。以48h为周期,测定叶片的光响应曲线(a - par)、水势(Ψw)、蒸腾速率(E)、气孔导度(gs)、叶片可溶性蛋白含量和过氧化物酶活性。黎明前的E、gs、Ψw和Ψw值分别为0.07 ~ 4.89µg/cm s、0.02 ~ 0.5 cm s-1、-0.025 ~ -1.05 MPa和0.1 MPa。雏菊E、gs、Ψw和Ψw在黎明前分别为0.47 ~ 12.27µg/cm s、0.17 ~ 1.42 cm s-1、-0.05 ~ -0.3 MPa和-0.075 MPa。小叶花在正午有气孔关闭的趋势,过氧化物酶活性随太阳辐射的增加而增加,而白桦则没有。小黄花的光补偿点(Ic)约为18.10µmol光子m-2s-1,为典型的日光植物;而白木为8.87µmol光子m-2s-1,略高于遮荫植物的报道最大值,低于光照植物的报道最小值。与parviflora(7.4µmol CO2 m-2s-1)相比,M. leucoxyla(2.8µmol CO2 m-2s-1)的最低光合速率(A)被更好的光子利用效率(±0.7792 mol C mol-1)所补偿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ecophysiological studies of two andean forest contrasting species Abatia parviflora and Myrcianthes leucoxyla under Bogotá conditions, Colombia
The physiological response of high Andean forest contrasting plants, Myrcianthes leucoxyla, a shadow-facultative heliophyte, and Abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in Bogota. Light response curves (A-PAR), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), leaf soluble protein content and peroxidase activity were measured in this study in a 48h cycle. The values for E, gs, Ψw and Ψw predawn for M. leucoxyla were 0.07 to 4.89 µg/cm s, 0.02 to 0.5 cm s-1, -0.025 to -1.05 MPa, and-0.1 MPa, respectively. For A. parviflora E, gs, Ψw and Ψw predawn were 0.47 to 12.27 µg/cm s, 0.17 to 1.42 cm s-1, -0.05 to -0.3 MPa and -0.075 MPa, respectively. A. parviflora presented a tendency of stomatal closure at midday and peroxidase activity increased with the increasing solar radiation, this did not occur in M. leucoxyla. The light compensation point (Ic) in A. parviflora was about 18.10 µmol photon m-2s-1, typical for a heliophyte plant; while for M. leucoxyla it was 8.87 µmol photon m-2s-1, slightly above the maximal reported values for shadow plants and under the minimal reported values for light plants. The lowest photosynthetic rate (A) of M. leucoxyla (2.8 µmol CO2 m-2s-1) in comparison with A. parviflora (7.4 µmol CO2 m-2s-1) is compensated with a better photonic use efficiency (± 0.7792 mol C mol-1).
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