贵州省林科所树木园,在贵阳市郊东南方向八公里,地势较平坦,是高原丘陵地貌,海拔1105.1米,东经106°42′,北纬26°38′。这里冬无严寒,夏无酷暑,年平均温度15.2℃,最高35.4℃,最低-7.8℃,年降雨量1128.3毫米,属中亚热带气候。土壤为石灰岩发育的山地黄壤,结构粘重,PH5～5.5左右,土层厚约一米以上,肥力条件差,水源不足,少部份 Arboretum of Guizhou Province, with an elevation of 1105.1 meters above sea level, longitude 106 ° 42 ’and latitude 26 ° 38’ north latitude, is eight kilometers southeast of Guiyang. There is no winter cold, no summer heat, the annual average temperature of 15.2 ℃, the highest 35.4 ℃, the lowest -7.8 ℃, the annual rainfall of 1128.3 mm, is a sub-tropical climate. The soil is mountainous yellow soil with developed limestone. The structure is heavy, with a PH value of about 5.5 to 5.5, the soil layer is about one meter thick, poor fertility, insufficient water resources and a small part