为了探讨我省粤北林区各种用材树种的适生条件及速生特性,为今后选择和发展适应性强、经济价值高、生长迅速的造林树种提供科学依据,我们从1973年春开始,在我院粤北乐昌教学基地进行了十四种用材树种与杉木对比的生长速度定位试验。供试验的针阔叶树种有:杉木、柳杉、水杉、池杉、 In order to explore the suitable living conditions and fast-growing characteristics of various timber species in the northern Guangdong forest region, and to provide a scientific basis for future selection and development of afforestation species with high adaptability, high economic value and rapid growth, we started from the spring of 1973 in our hospital Yuechang North Lechang teaching base for fourteen timber species and fir growth rate positioning test. Coniferous and broadleaf species for the test are: Chinese fir, cedar, Metasequoia, Ipomoea,