兰考泡桐不定芽自然接干规律研究

在相同立地条件下，分别对兰考泡桐林分、四旁树和孤立木样木（包括依靠不定芽自然接干的１５０株和人工接干的３０株）与接干有关的生长因子进行实测，并建立兰考泡桐接干形率与主要生长因子的数学模型；不同栽植方式对接干形率、第一接干高均有显著影响；第一接干高与苗高呈负相关，但相关性不显著；第一接干发生时的树龄以３～４ａ对接干形率的影响最佳，５ａ以后接干效果较差．同时对兰考泡桐不定芽接干各种树形图谱及其在各栽植条件下所占的比例、兰考泡桐第一接干发生时的树龄分布及林分、四旁树、孤立木条件下的相应接干方式等问题进行了探讨．

Study on the Law of Natural Trunk Extension by Adventitious Buds of Paulownia elongata

By respectively real surveying on 150 Paulownia elongata along sample trees of natural trunk extension by adventitious in stand, along roadside and single tree with the same site type, the quantitative model between form quotient of natural trunk extension of \%Paulownia elongata\% and main tree growth factors is established. Different plant patterns, influence markedly on the form quotient of trunk extension and the height of first trunk extension. The correlation between the height of first trunk extension and height of trunkbase is minus correlation, but the correlation is not marked. The relationship between the age when first trunk extension occurs and the form quotient of trunk extension is that, trunk extension is fine when the age is 34 years, and it is not fine afterwards. Meanwhile, the shape atlas of natural trunk extension of \%Paulownia elongata\% by adventitious and their respective proportion, the proportion of the age when first trunk extension occurs in three plant patterns and the appropriate cultivation of their stem form are studied as well.