营林措施对马尾松幼树阶段生长的影响

Effects of Silviculture Measures on Growth of Young Pinus massoniana Plantation

在相同的立地条件下,通过比较不同营林措施下马尾松(Pinus massoniana)幼树阶段林分保存率、郁闭度、生长量和蓄积量的差异,探讨适宜的营林措施。结果表明,在传统营林措施管理下,马尾松林分保存率在造林后第2年快速下降,林分平均胸径、树高、蓄积量生长缓慢,5年生时未能郁闭;使用速生营林措施的林分则维持较高的保存率,林分平均胸径、树高、蓄积量生长迅速,3年生时基本郁闭。3年的持续养分供应、土壤管理和杂草抑制能有效促进马尾松幼树快速生长,加速幼林郁闭,利于形成相对稳定的群落。

In the same site condition,forest preserving rate,canopy density,increment and volume of young Pinus massoniana plantation were compared by different silviculture measures to find out suitable measures.Results showed that preserving rate of P.massoniana forest decreased rapidly in the second year after afforestation by traditional silviculture measures.Average DBH,tree height and volume of stands increased slowly,which failed to close when they were five years old.Stands could maintain high preserving rate by fast-growing silviculture measures.Average DBH,tree height and volume of stands growed rapidly,which basically closed when they were three years old.Nutrient supply for three years,soil management and weeding could effectively promote rapid growth of P.massoniana saplings,accelerate closure of young forests,and facilitate formation of relatively stable communities.