樟子松人工林在辽东山区的生长评价

辽东山区20世纪80年代开始从内蒙古红花尔基引种樟子松营造人工林。20多年的实践表明,樟子松人工林在15 a生前生长较快;直径、树高连年生长量15 a生后呈下降趋势,20 a生后下降显著;直径、树高平均生长量20 a生后下降明显;15 a生前针叶量正常,而15 a生后针叶量明显下降,生长势弱,保存率低,纬度愈低生长愈差;生长量明显低于同龄的日本落叶松、红松,亦低于冷杉和云杉。因此,樟子松在辽东山区只适宜在较差立地上营造生态公益林,不宜作为培育用材林的树种。

Growth evaluation of Pinus sylvestris var.mongolica platation in East-liaoning mountain area of China

Pinus sylvestris var.mongolica,it had been introduced since the eighth decade of the 20th century from Honghuarji of Inner Mongolia to East-liaoning mountain area of China.Plantation trial over 20 years shows following results: This species had a fast process in stand growth before 15-yr-old;the current annual increment presented a downtrend after then(evidently at 20-yr-old).Also, this had declining mean increments both of diameter and tree height after 20yr-old.The needle amount was normal befor 15-yr-old and then descending clearly.This had weak growth potential and low preserving rate,a poorer growth was getting more and more with the reduction in latitude.Compared with Larix kaempferi, Pinus koraiensis,Abies nephrolepis and Picea koraiensis in same stand age,the growth increment of Pinus sylvestris var.mongolica plantation is low obviously.Therefor,it is only suitable to be used in building ecological commonweal forest,and inadvisable to be used in cultivating timber forest.