桂西南2种更新方式尾巨桉人工林生长特性的比较

Comparison on Growth Characteristics in Two Regeneration Patterns of Eucalyptus urophylla × E. grandis Plantation in Southwest Guangxi

采用固定标准地法对广西宁明县2种不同更新方式(植苗更新和萌芽更新)的尾巨桉(Eucalyptus urophylla×E.grandis)生长特性进行分析比较。结果表明:2种更新方式的尾巨桉人工林均表现出快速生长的特性,4年生植苗林的平均胸径、树高和材积分别为11.7 cm、17.0 m、0.090 7 m^3,4年生萌芽林的平均胸径、树高和材积分别为12.0 cm、17.7 m、0.097 4 m^3,均表现出快速生长的特性。1~4年生桉树萌芽林的平均树高、胸径和材积平均生长量均明显高于桉树植苗林。因此,萌芽更新更能是一种比植苗更新发挥尾巨桉速生特性的经营方式。

The growth characteristics of Eucalyptus urophylla×E.grandis plantations in two regeneration modes(planting regeneration and sprout regeneration)were investigated by permanent plots method in Ningming county of Guangxi.Results showed that the growth of E.urophylla×E.grandis was rapid.The average diameter at breast height(DBH),height and volume of 4-year-old planting stand were 11.7 cm,17.0 m,0.090 7 m3,respectively,and the average DBH,height and volume of 4-year-old coppice were 12.0 cm,17.7 m and 0.097 4 m3,respectively.The average height,DBH and volume of 1-year-old to 4-year-old coppices were significantly higher than those of planting stand.Therefore,sprout regeneration was a kind of management method which was easier to expound fast-growing characteristics than planting regeneration.