不同种植密度卷荚相思在饶平的生长表现

Growth Performance of Acacia cincinnata with different Planting Density in Raoping

4种不同种植密度的卷荚相思Acacia cincinnata在种植4 a、12 a后的观测结果显示:卷荚相思不同种植密度对林木高生长无显著影响,但对其胸径、生长和保存率有显著影响;密度对林木材积生长具有一定影响,它与林分单株材积呈负相关,其关系式可用V=a x-b来表示。4 a生林分材积与密度呈正相关,在密度1.5 m×3 m时达到最高。12 a生林分因显著的林分效应与保存率变化,低密度(3 m×3 m)林分材积达到最高,最低林分密度与最高林分密度保存率相差15.54个百分点;试验证明卷荚相思在饶平培育小径材可考虑选用1.5 m×3 m株行距,而培育中、大径材选用3 m×3 m株行距更为适宜。

The observation results of 4 different planting densities of Acacia cincinnata showed that:planting densities of Acacia cincinnata had no significant influence on the growth of tree height,but had significant influence on its’DBH,growth and survival rate.The planting density had a certain influence on the growth of timber volume,it was negatively correlated to the individual volume of stand and the relationship could be expressed by V=a x-b.There was a positive correlation between stand density and stand volume for 4-year plantations,reaching the highest at the density 1.5 m×3 m.The stand volume reached the highest at the density 3 m×3 m for 12-year plantations owing to the distinct stand effect and changes in conservation rate,and generate a 15.54%difference between the lowest and highest stand density.The research proved that the 1.5 m×3 m row spacing could be considered for cultivation of small-diameter timber,while 3 m×3 m row spacing was more suitable for medium diameter and large-diameter timber in Raoping.