呼吸作用是植物体内物质代谢和能量转换的主要过程之一。它是许多生理过程的基础。例如:水份和矿质的主动吸收、盐类的积累、硝酸根的还原、有机物质的转化和运输、抗病等等都是与呼吸作用有直接或间接联系的。因此,呼吸作用是树种生物学特性的重要的指标之一。我们于1963年对红松、落叶松和油松的呼吸作用进行测定和比较。结果如下。一、方法 Breathing is one of the main processes of material metabolism and energy conversion in plants. It is the foundation of many physiological processes. For example: the active absorption of water and minerals, the accumulation of salts, the reduction of nitrate, the conversion and transport of organic matter, disease resistance, and so on, are directly or indirectly related to respiration. Therefore, respiration is one of the important indicators of the biological characteristics of tree species. In 1963 we measured and compared the respiration of Korean pine, larch and Chinese pine. The result is as follows. First, the method