兰考泡桐是鲁西地区林粮间作和营造速生丰产林的主要树种。为做到科学营林,提高生产管理水平,摸清胸径年生长规律是非常必要的。为此,我们在4年中观测了泡桐胸径生长的变化规律,现将观测结果介绍如下。 Paulownia paulownia is a staple of forest-grain intercropping and the creation of fast-growing and high-yield forests in Luxi area. In order to achieve scientific management of forests and improve the level of production management, it is necessary to find out the law of annual growth of diameter at breast height. To this end, we observed in 4 years the growth of DBH growth rules, the observations are as follows.