杨树是我县四旁绿化和营造农田林网的主要树种。近年来,北京杨等杨树品种相继在我县大面积种植,一些外来品种也开始引进种植。为了选择适于本地的速生优种,我们从1978年夏季开始,对顺中大队不同品种的杨树生长情况,进行了观察,1979年冬季和1981年10月16日又连续进行了观察,并调查了其他地方的一些杨树品种的生长情况,现总结如下: Poplar is the afforestation around my county and create the main species of farmland forest network. In recent years, Beijing Yang and other poplar species have been planted in large areas in our county, some foreign species have also begun to introduce cultivation. In order to choose the best fast-growing and best-suited local species, we started from the summer of 1978 and observed the growth of different varieties of poplar trees in the Shunzhong Brigade. The observation was continued in the winter of 1979 and October 16, 1981, Investigated the growth of some poplar varieties elsewhere, are summarized as follows: