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作 者 ：张振珏；林锦仪；陈忠仁；张永田

期 刊 ：云南植物研究 1997年 19卷 03期 页码：1-3

关键词：余甘子；杨梅；黑荆树；细枝木麻黄；形成层；韧皮部；

Keywords:Phyllanthus emblica,

摘 要 ：余甘子 Phyllanthus emblica L.杨梅 Myrica rubra（Lour.）Sieb.et Zucc．黑剂树 Acacia mearnsii De Wilde形成层的活动有明显的季节性。形成层活动期分别为5～11月，3～12月，2～10月。其他时间休眠。细枝木麻黄 Casuarina cunninghamiana Miq的形成层周年都在活动，l，2月的材料中也见到成膜体。4种树木在冬季都保留相当数量的具功能韧皮部，其宽度为0.2～0.3 mm。

Abstract:There is definitely seasonal activity in cambial growthes in the Phyllanthus emblica, Myrica rubra, Acacia mearnsii, The periods of cambial activity are respectively from May to No-vember, March to December and February to October. These cambia are dormant in other time in a year. The cambium of Casuarina cunninghamiana is active all year round. There are phragmoplasts in tangential sections of cambium in January and February. During dormancy of cambia, every species retains rather wide functional phloem (0.2- 0.3 mm in width).

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