泡桐枝叶相关关系的研究

为确定泡桐修枝强度的适宜表示方法，对４年生泡桐枝叶相关关系进行了研究．结果表明：①泡桐侧枝的长度（ＢＬ）与基径（ＢＤ）间具有极显著的回归关系，随着泡桐侧枝ＢＤ的增大，其ＢＬ的增长幅度逐渐减小．②在侧枝干重（ＢＤＷ）与其ＢＤ，ＢＬ，ＢＤ２ＢＬ间的回归关系中，以ＢＤＷ与ＢＤ关系最为显著，因此ＢＤ适用于建立ＢＤＷ的预测模型．③泡桐侧枝的叶柄干重（ＰＤＷ）和叶片干重（ＬＤＷ）的比值为常数０．１４００，泡桐叶片单位干重的叶面积（ＬＡ）为常数１２２．９１ｃｍ２·ｇ－１．④ＬＤＷ或ＬＡ与侧枝参数之间关系的趋势是完全一致的．泡桐侧枝ＬＡ与各侧枝参数间回归关系紧密的顺序为ＢＤＷ与ＬＡ＞ＢＤ２ＢＬ与ＬＡ＞ＢＤ与ＬＡ＞ＢＬ与ＬＡ．考虑到在实际生产中应用的可行性，建立ＬＡ与ＢＤ的乘幂函数模型预测ＬＡ以间接表示泡桐的修枝强度是适宜的．

Study on Branch Leaf Correlation of Paulownia Trees

In order to determine the suitable expressing method of pruning strength,the branch leaf correlation of 4 years old Paulownia trees is studied.The results are as follows:① The regression relation of B L (length of branch) with B D ( diameter at the base end)is extremely significant. ② The regression relation of B DW (the dry weight of branch ) with B D can be expressed by B DW = 15 141 B D 2.873 7 , being closer than that of B DW with B L or B D 2B L. It is optimum to use B D for establishing B DW prediction model.③The ratio of P DW ( dry weight of petioles ) to L DW (dry weight of leaves ) is 0.140 0. The L A of unit weight leaves is 122.91 cm 2·g -1 . ④The trends of the correlation of L DW and L A with B D, B L, or B D 2B L are correspondent thoroughly. The sequence by the closeness of these correlation is L A B DW > L A B D 2B L > L A B D > L A B L. Accounting for the feasibility in practice,it is optimum to use B D for establishing L A B D power function model to predict L A and then proceed to express pruning strength of Paulownia trees indirectly.