不同栽培条件下南方红豆杉生长特性研究

Growth characteristics of Taxus chinensis var.mairei under different cultivation conditions

关键词:  南方红豆杉  栽培条件  生长特性

Key words:  Taxus chinensis var.mairei  cultivation conditions  growth characteristics

摘要:

以4～6年生南方红豆杉为材料，对其不同栽培条件下地径、冠幅、株高、当年抽高、当年侧枝数及总侧枝数等生长特性进行了研究。结果表明：南方红豆杉4～6年生幼林生长量随年龄增大而增加，但其增加的趋势变缓，生长速度变慢；耕作农田中南方红豆杉生长最好，土壤板结未耕作农田生长较差，去除上层20 cm耕作土的农田最差；南方红豆杉纯林生长好于落叶阔叶林下（林分郁闭度0.6～0.7），且种植密度越大差异越明显；南方红豆杉落叶阔叶林下套种及纯林生长量均随栽培密度减小而增大，不同栽培密度相差越大，生长量差异越明显。

Abstract:

Growth characteristics of 4-6 year old Taxus chinensis var.mairei under different cultivation conditions were studied，including collar diameter，crown diameter，plant height，sprouting height in current year，branch number in current year and total branch number. The results indicated that the growth of 4-6 year old seedlings increased with growing ages，but the tendency and growth rate became slower；seedlings manifested respectively the best，the worse and the worst growth in cultivation farmland，uncultivated farmland with soil hardening and farmland get rid of 20 cm cultivation soil. The plant growth of pure forest was better than that in deciduous broad leaved forest with canopy density of 0.6-0.7，which was much remarkable with bigger cultivation density，and they both increased as cultivation density reduced；the difference in plant growth was more significant when there were greater differences in cultivation density.