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在陕西省宁陕县火地塘教学实验林场设置固定标准地，研究了华山松（ＰｉｎｕｓａｒｍａｎｄｉＦｒａｎｃｈ．）针叶的动态变化。研究结果表明华山松１龄针叶总生物量在全年持续增加，而２、３龄针对则慢慢减少。１龄针叶总生物量在５月下旬到８月初增加最快。各龄针叶的理论死亡率可用于估算林分全年叶量及落叶量。华山松针叶叶长和叶重高度相关。华山松林一年有两个落叶高峰期：５～６月和９～１０月。华山松枝长与叶痕数紧密相关。
A fixed standard was set up in Huoditang Teaching Experimental Forest Farm, Ningshan County, Shaanxi Province to study the dynamic changes of needles in Pinus armandi Franch. The results showed that the total biomass of Pinus armandii in the first instar increased continuously throughout the year, while the second and second instars gradually decreased. The total biomass of the first instar increased fastest from late May to early August. The theoretical mortality of needles at each age can be used to estimate the amount of annual leaves and deciduous foliage. Pinus armandii needle leaf length and leaf height related. Huashan pine forest has two deciduous peaks during the year: May to June and September to October. Pinus armandi is closely related to the number of leaf marks.