测定松树针叶净同化率的双针法研究初报

<正>德人Saehs在1883年创造了测定植物光合作用的半叶法,所需设备简单、能测定自然条件下植株的光合作用,近百年来一直受到重视。在叶面积定量取样和防止同化物外运等方面经过不断的改进,这个方法的精确度显著提高,并应用之于农作物和阔叶树上,最近已有较为详细的介绍。但在针叶树上半叶法的应用一直没有什么进展,主要原因是定量取样问题没有解决。 双针法利用同束针叶干重分布相似的特点,克服了取样的困难,用极简单的设备,测定了松针净同化率,并得到满意的结果。本文系半叶法成功地用之于针叶树的首次报道,兹简介如下。

A Preliminary Study on a Pair-Needle Method for Measuring the Net Assimilation Rate of Pine Needles

Based on the similarity of dry weight distribution of individual needles in a fascicle, a pair-needle method was developed for measuring the net assimilation late of pine treedles and promptly applied to the 2-year old needles of Pinus thumbergii. The results obtained were considerably stable and satisfactory.