为了解北亚热带林植物叶水平生态化学计量特征和季节变化规律,以安徽石台常绿阔叶林三种优势乔木(甜槠、树参和老鼠矢)为研究对象,通过不同季节采集其成熟叶片进行分析。结果显示,3树种叶片C含量全年变化规律一致,呈先减后增趋势。区域中N元素相对充足,而P元素成为植物生长受限元素。C/P与C/N比值之间比较发现,甜槠对N、P的利用效率最高,其次为老鼠矢,树参的养分利用效率最低。3树种叶片N、P含量及C/N、C/P和N/P周年变化规律各不相同,N、P含量呈现高度正相关,叶片C/N和C/P的季节变化趋势与叶片N、P含量的变化规律相反,叶片N/P的季节变化趋势与叶片P含量的变化规律相反,表明了叶片N、P含量对叶片C/N与C/P的主导作用以及叶片N/P主要受P含量决定。本实验中,各指标全年变异系数大小为:P>C/P>N/P>N>C/N>C。C、P、C/N、C/P以及N/P的变异来源均表现为植物种类影响最大,月份间差异次之,月份和植物种类交互作用的影响最小。 In order to understand the ecological stomatal characteristics and seasonal variation of leaf level in the north subtropical forests, the three dominant trees (sweet shrimps, tree ginseng and rodent saplings) of evergreen broad-leaved forests in Shitai of Anhui Province were selected as the research objects and their maturity Leaf for analysis. The results showed that the content of C in leaves of three species varied regularly throughout the year, decreasing first and then increasing. The N element in the area is relatively abundant, while the P element becomes the plant growth limited element. The comparison between C / P and C / N ratio found that sweet 槠 had the highest utilization efficiency of N and P, followed by the mouse vector, and the lowest utilization efficiency of tree ginseng. The content of N, P and the C / N, C / P and N / P of tree species vary greatly in each year, and the content of N and P is highly positively correlated. The seasonal trend of leaf C / N and C / , But the change trend of P content was opposite. The seasonal variation trend of leaf N / P was opposite to that of leaf P content, which indicated the leading role of N and P content on leaf C / N and C / P and leaf N / P main By the P content decision. In this experiment, the annual variation coefficient of each index is: P> C / P> N / P> N> C / N> C. The sources of variation of C, P, C / N, C / P and N / P all showed the greatest impact on plant species, followed by the difference between months, and the interaction between months and plant species had the least impact.