This study focused on the photosynthetic characteristics of Thuja sutchuenensis seedlings and its relationship with environmental factors under three light levels (full light, 50% full light, and 25% full light). The results showed that under different light environments, the maximum value of net photosynthetic rate Pn appeared at the 8:00 with the sizes were 6.48, 4.59, and 2.67 μmol·m-2·s-1. There existed "midday-depression" in the diurnal photosynthesis of T. sutchuenensis, which mostly contributed by non-stomatal factors. The results of path analysis demonstrated that among the environmental factors affecting the photosynthesis of T. sutchuenensis under different light environments, the photosynthetically active radiation and air CO2 concentration were the main decision factors, while the main limiting factor was the air temperature.

目的 为了从细胞学角度探讨崖柏属植物分类与进化问题， 方法 采用根尖压片法对崖柏属5种植物进行核型研究。 结果 表明：崖柏和日本香柏的核型公式为2n=2x=22=18m（2SAT）+4sm，朝鲜崖柏、北美乔柏和北美香柏的核型公式为2n=2x=22=20m（2SAT）+2sm，5种植物的核型均属于1A类型。 结论 该属在柏科中可能处于比较进步的进化地位；通过进化趋势图分析发现，崖柏在该属中分化最晚，而朝鲜崖柏则较原始。