几种杨树无性系扦插苗苗高年生长规律的研究

以田间调查数据为基本材料，用Logistic方程对欧关杨107号等7个杨树品种的1年生扦插苗的苗高年生长规律进行模拟研究．结果表明：Logistic方程能很好地表达7个杨树品种的苗高年生长动态，相关系数均达0．99以上；苗木生长期可划分为3个阶段，即生长前期、速生期和生长后期，日生长量最大的时间大约出现在第118d左右，速生期出现在第93d到142d，持续时间约50d，占整个生长期的24％左右，但生长量却占年总生长量的58％。

Annual Height Growth Laws of Saplings from Cuttings of Some Poplar Clones

On the basis of data analysis derived from field investigation, a simulation research on height growth law of one-year saplings from cuttings of 7 poplar strains including No.107 Popular euramericana was conducted by means of Logistic equation. The results showed:The annual growth trends of the 7 poplar strains saplings could be well demonstrated by Logistic equation, and the relevant coefficient exceeded 0.99.The growth phase of the cutting saplings could be divided into 3 stages, i.e., the pre-growing stage, the fast-growing stage, and the post-growing stage. The largest daily growth appeared around the 118~(rd) days after the cuttage was done, and the fast-growing stage appeared between the 93~(rd) and the 143~(rd) days, which lasted for about 50 days, accounting for 24% of the whole growth period. However, the growth quantity during the fast-growing stage was about 58% of the annual growth quantity.The results corresponded with the production situation, which might provide theoretical base for the production and management of poplar cuttings.