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森林次生演替优势种苗木的光可塑性比较研究 预览 被引量:8

THE COMPARATIVE STUDY ON PHOTO PLASTICITY OF THE DOMINANT SPECIES SEEDLINGS OF SECONDARY FOREST SUCCESSION
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摘要 本文从研究苗木的叶绿素含量和RuBP羧化酶活性随着光环境的变化而发生改变的规律出发,来探讨森林次生演替优势种苗木的光可塑性大小和弱光环境的适应能力,各种苗木的叶绿素含量都随着光强度变弱而增加,但如果较长时间生长在弱光环境中,由于叶绿素的合成小于分解,其含量也会逐渐变小,不同的演替阶段优势种苗木的叶绿素含量的增加或减少在量上有一定的区别,以叶绿素含量随着光环境变化的测定值为指标,用模糊数学分析的结果 Based on the study of the variation of chlorophyll content and RUBISCO activity of seedlings in different photo habitats, this paper studied the photo plasticity and adaptability to forest shady of the dominant species seedling of secondary forest succession. The chlorophyll content increased as the illumination became weaker, but the chlorophyll content decreased, if the seedlings grew in weak illumination habitats for long time. But these variations were different among the dominant species seedlings in different forest successional stages. The results showed that the tolerant shade degrees were Cryptocarya concinna (late tree) > Castanopsis fissa (transitional tree) > Shima superba (also transitional tree)> Pinus massoniana (pioneer tree). The activity of RUBICO of Pinus and Shima increased as the illumination stronger. But the activity of RUBICO of Cryptocarya was the highest in 1 hour sunshine a day (like forest gap habitats). Middle and late successionals grew better in 1 hour sunshine a day habitat, except Pinus' seedlings. The tolerant shade seedlings could grow better in the forest gap habitats, because the sunshine could activate their activity of RUBICO, and the short sunshine didn't bleach the chlorophyll.
作者 杨小波 王伯荪 YANG Xiao Bo (Hainan university, Haikou 570228) WANG Bo Sun (Zhong Zhan university, Guangzhou 510275)
机构地区 海南大学 中山大学
出处 《植物学通报》 CSCD 1999年第3期 304-309,共6页 Chinese Bulletin of Botany
关键词 森林次生演替 苗木 光可塑性 树种 适应能力 Forest secondary succession, The photo plasticity of tree, The adaptability of plant population
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