<正>对松属８个树种的净光合速率（Ｐｎ），蒸腾速率（Ｅ），气孔阻力（Ｒｓ）和叶温（Ｔｅ）等生理指标进行了测定。结果表明，某些树种存在相似的生理特性；具有相似生理特性的树种对环境有相同的生理需求。采用模糊聚类分析对参试树种按生理特性分成三类：第一类，Ｐｎ和Ｒｓ较大，Ｅ较小，宜生长于光照强，二氧化碳浓度高，水分要求不高的立地；第二类与第一类相反，第三类为居间类型。据此，在造林生产中根据树种的生理特性，适地适树，创造良好的经济效益。

Based on measurements of net photosyn thesis (NP),stomatal resistence (RS) and transpiration (TR),the vesults showed that there existed similar physiological characteristics among some species of conifer. This implied that physiological requirements for environmental conditions, in which some species of conifer were grown, are identical. By the analysis of fuzzy cluster,eight species were divided into three groups. The first group was characterized by high NS and RS.and low TR,and correspondingly fit for a site with high light intensity, greater CO2 concentration and low water demand; the second was opposite in characters and the last median. so it is necnssary to choose trees suited to the site to get more economical benefit.