青檀一年生播种苗的年生长规律

青檀一年生播种苗苗高、地径的年生长变化及其地上部分生物量组分的分配模式研究结果表明，苗高、地径的生长规律符合S型生长曲线，可用Logistic方程来拟合；同时可把生长期划分为4个阶段，即出苗期（5月1日以前）、生长初期（5月1日～6月15日）、生长盛期（6月16日～8月15日）和生长后期（8月16日～10月30日），其中、生长盛期的生长量占年生长量的60%左右。一年生播种苗地上部分各组分的生物量分配比例为叶：木质部：檀皮=40.1:47.8:12.1；苗高、地径和地上部分总生物量（檀皮）呈线性相关，且地径和地上部分总生物量及檀皮的相关系数分别要大于苗高与两的相关系数。

Studies on Annul Growth Dynamics of One-year Seedlings of Pteroceltis tatarinowii

Annul growth rhythm of height, caliper and distribution of aboveground biomass on one-year seedlings of Pteroceltis tatarinowii were studied in this paper. The results indicated that growth pat- terns of height and caliper are fitted for S curve and can be simulated with Logistic equation. At the same time, the growing period of both height and caliper is divided into 4 stages according to its growth rate: emergence phase of seedling( before May 1), initiation phase of seedling growth(from May 1 to June 15 ), prosperous phase of seedling growth(from June 16 to August 15 ) and later phase of seedling growth( from August 16 to December 30). The production of prosperity period is 60% of gross of whole year. The paper also indicated that the biomass distribution ratio of leaf : xylem : bark was 40. 1 : 47.8 : 12. 1 and height and caliper are linear correlation with aboveground biomass and bark yields, however, two of correlation value of caliper with biomass and bark are higher than height's.