杉木与楠木、鹅掌楸混交林及其纯林的生长差异

以杉木纯林为对照，对同林龄楠木＋杉木、鹅掌楸＋杉木混交林的生长量和经济效益进行了比较，结果表明：造林9年后，鹅掌楸的胸径、树高和材积均高于楠木，混交林中杉木的生长差异不大，但胸径和材积显著小于纯林；2种混交林的经济产出均高于纯林，但差异不大。

Growth Difference in Pure and Mixed Stands of Cunninghamia lanceolata,Phoebe zhennan and Liriodendron chinense

Taking the Cunninghamia lanceolata pure forest as contrast ,the growth and economic efficiency of Phoebe zhennan ＋ Cunninghamia lanceolata and Liriodendron chinense ＋ Cunninghamia lanceolata mixed stands at the same forest age were compared ,the results showed that after 9 years afforestation ,the DBH ,tree height and vol-ume of L iriodendron chinense were higher than those of Phoebe zhennan ;there was no significant difference on the growth of Cunninghamia lanceolata in the two mixed stands ,but the DBH and volume were significant smaller than that in the pure forest ,the economic efficiency of the two mixed stands was higher than the pure forest ,but the difference was not obvious .