叶是植物体进行光合作用的主要器官，又是凋落物及林分养分归还的主要来源，叶量的任何改变直接影响到林木生长的进程，而其增减，又是与林分养分归还状况紧密相关。但什么时候养分吸收与归还处在平衡状态呢？林分叶生物量峰值是一个关键值（盛炜彤，2014）。因此，研究林分叶生物量变化及其与生长和地力维护的关系及林分叶生物量峰值出现的时间节点对于做好人工林的培育管理很有意义。杉木（Cunninghamia lanceolata）是我国南方主要的速生丰产林树种，在我国人工林中占有重要的地位。本研究拟以亚热带不同气候区杉木人工林为研究对象，基于自然稀疏规律构建杉木人工林林分叶生物量模型，分析杉木林分叶生物量的动态变化及其峰值时间节点，并解析峰值时间节点与数量成熟龄的关系以及达到峰值时杉木人工林的地力维护能力情况，为合理经营不同气候梯度杉木人工林提供理论依据。

Leaf is the main organ of photosynthesis in plants, and the main source of nutrients returning to soils. The leaf amounts directly affect the growth process of trees, and its changes are closely related to the nutrient return to soils. But when the nutrient uptakes and returns are in equilibrium? The maximum value of stand leaf biomass is a key point (Sheng, 2014). Therefore, it is of great significance to study the changes of stand leaf biomass, its relationship with growth and site quality maintenance, as well as knowing when the stand leaf biomass is largest (peak time), which will be helpful for the cultivation and management of plantations. Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) is the most important conifer species for timber production with huge distribution area in southern China. Here, in this project the stand leaf biomass model of Chinese fir plantation in different climatic zones in subtropical was established according to self-thinning law. Then the dynamic changes of stand leaf biomass and its peak time during the forest succession was analyzed. Also the relationships between peak time and the quantitative mature age and the soil quality maintenance of Chinese fir plantation at the peak time were explored. The results will provide the insights into managing Chinese fir plantations distributed in subtropical climate gradients.