杉木是中庸树种,在气候温暖,空气湿润和肥沃的沙质壤土上生长比较迅速,而在气温高、空气湿度小及干旱贫瘠的粘质土壤上生长不良.过去在造林时,有的地方选地不当,经营较粗放,至使部分形成“小老树”林,不能成林成材.为了摸索使小老树林返老还童,复其长势的改造办法,于七二、七 Cunninghamia lanceolata is a moderate tree that grows rapidly on warm, airy and fertile sandy loam and grows poorly on clayey soils with high temperatures, low air humidity, and poor arid conditions. To improperly managed, more extensive operation, so that part of the formation of “little old tree”, can not become a success .In order to explore the old rejuvenation of the little old tree, the recovery of its growing approach to reform, in seven two, seven