陈山红心杉良种造林幼龄期密度效应分析  

Effects of improved varieties and planting densities on the growth of young red-heart Cunninghamia lanceolata plantations

作　　者：宋晓琛[1] 熊彩云[1] 娄永峰[1] 陈兴彬 孙世武 李彬 肖复明[1] SONG Xiaochen;XIONG Caiyun;LOU Yongfeng;CHEN Xingbin;SUN Shiwu;LI Bin;XIAO Fuming(Jiangxi Academy of Forestry,Nanchang 330013,Jiangxi,China;Baiyunshan Forest Farm,Ji’an 343200,Jiangxi,China)

机构地区：[1]江西省林业科学院,江西南昌330013 [2]白云山林场,江西吉安343200

出　　处：《中南林业科技大学学报》2022年第3期1-7,共7页Journal of Central South University of Forestry & Technology

基　　金：国家重点研发计划项目(2021YFD2201301-02,2016YFD0600303-01);江西省重点研发计划项目(20181ACF60011);江西省林业科技创新专项项目([2021]11号);南昌市重点实验室建设计划项目(2020-NCZDSY-011)。

摘　　要：【目的】探讨陈山红心杉不同良种和初植密度对其幼龄期生长的影响及其互作效应,旨在为红心杉良种的初植密度优化提供理论依据。【方法】以2015年在江西省吉安市青原区白云山林场营造的红心杉试验林为研究对象,采用完全随机区组设计,根据连续5年树高、胸径等调查数据,分析2个陈山红心杉种子园良种(1代良种和1.5代良种)和4个初植密度(1667、3333、5000、6666株/hm^(2))控制下的早期生长动态效应。【结果】1)造林初期,不同初植密度对树高和胸径生长差异不显著,但造林6 a,低初植密度(1667株/hm^(2))林分树高、胸径和单株材积显著高于其他3个密度,且低初植密度对1.5代良种影响大于1代良种;2)6年生红心杉早期生长双因素方差分析表明,各密度林分间红心杉树高、胸径、单株材积生长差异达极显著,而良种效应未达显著水平,但林龄越大,良种对红心杉树高、胸径生长的正效应越明显,如造林6 a,低、中密度林分(1667、3333、5000株/hm^(2))1.5代良种树高、胸径、单株材积生长高于1代良种,但高密度林分(6666株/hm^(2))则相反;3)红心杉2个良种密度较大的林分(6666株/hm^(2))多为小径级林木,中密度林分(3333株/hm^(2)和5000株/hm^(2))多为中径阶林木,大径阶林木则集中在低密度林分(1667株/hm^(2)),造林密度越低,大径级林木株数越多,1代和1.5代良种大径级DBH>11 cm,单株出现频率分别达22.22%和23.33%。【结论】1)初植密度1667株/hm^(2)有利于红心杉良种早期生长,且适合大径材培育;2)低、中密度种植对陈山红心杉1.5代种子园良种生长优势更明显。【Objective】The objective of this study was to explore the effect of different improved varieties and planting densities on the growth of young red-heart Cunninghamia lanceolata plantations and their interactions,to provide a theoretical basis for the selection of the optimal planting density.【Method】By taking the red-heart Cunninghamia lanceolata test forest in the state-owned forestry farm of Baiyunshan,Ji’an,Jiangxi Province as the research object,a completely randomized block design method was applied.Based on the 5-year survey data of tree height and diameter at breast height(DBH),the effects of different improved varieties(the 1st and the 1.5th generation seedlings of seed orchard of Chenshan red-heart Cunninghamia lanceolata)and different planting densities(1667,3333,5000,6666 trees/hm^(2))on the dynamic growth of the young red-heart Cunninghamia lanceolata plantations were analyzed.【Results】1)In the early stage of planting,different densities showed no significant effect on tree height and DBH.The tree height,diameter at breast height and volume per plant were significantly higher in stands with a low initial planting density(1667 plants/hm^(2))after 6 years of afforestation in comparison with the other 3 densities.Meanwhile,the low initial planting density had a greater impact on the 1.5th generation of improved varieties than the 1st generation.2)Analysis of variance showed that the difference of the tree height,DBH and stem volume of forests with different planting densities was extremely significant.In the early stage of stand growth,the effect of the improved varieties was not significant.Whereas with the increase of stand age,the improved varieties showed a more obvious positive effect on the tree height and DBH.After 6 years of afforestation,the tree height,DBH and stem volume of the 1.5th generation improved varieties were higher than those of the 1st generation at low or medium planting densities(1667,3333 and 5000 trees/hm^(2)),but the opposite was true in high-density stands(6666 t

关 键 词：陈山红心杉 初植密度 良种 幼龄林 

分 类 号：S791.27[农业科学—林木遗传育种]