| 摘要: |
| 【目的】研究林隙大小对土沉香人工更新幼树生长发育的影响，为我国南亚热带地区马尾松林下人工更新提供参考。【方法】以广西凭祥市中国林业科学研究院热带林业实验中心人工马尾松大(83~109 m2)、中(52~76 m2)、小(18~43 m2) 林隙以及林冠下栽植的4年生和12年生土沉香幼树为研究对象，采取典型抽样法，对土沉香幼树生长、叶片形态和一级枝条特征进行系统调查，并测定2种年龄幼树的生物量及其分配特征。【结果】随林隙面积的增大，2种年龄土沉香幼树的胸径、树高、冠幅和树冠长度均有一定程度的增长；叶片长度、宽度、平均单叶面积和比叶面积随林隙增大而减小，叶片长宽比则逐渐增加，且均存在显著性差异(P＜0.05)；一级分枝的枝条基径、枝条长度和枝条数量均随林隙面积的增大而增加，分枝角度则逐渐减小；叶片、枝条、根、树干以及全株生物量均随林隙面积增大而增加，表明大林隙有利于促进幼树生长发育，林冠下的光照严重不足，抑制幼树生长而影响生物量积累。【结论】林隙对人工更新苗木的影响长期存在，大林隙有利于土沉香幼树生长和生物量积累，小林隙及林冠下其生长受到严重抑制。 |
| 关键词: 林隙 更新苗木 土沉香 生物量积累 |
| DOI： |
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| 基金项目:中国林业科学研究院基本业务费项目(CAFYBB2017MB020) |
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| Effects of gap size on growth of transplanted saplings of Aquilaria sinensis |
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PANG Shengjiang,ZHANG Pei,YANG Baoguo,et al
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| Abstract: |
| 【Objective】This study investigated the long-term effects of gap size on growth of Aquilaria sinensis saplings to provide support for artificial regeneration of masson pine plantation in South Subtropical Area of China.【Method】The random sampling method was used in forest region of the Experimental Center of Tropical in Guangxi to survey growth,leaf and first-order-branches morphological characteristics as well as biomass allocation in planted young trees at the ages of 4 years and 12 years with different gap sizes of large (83-109 m2),intermediate (52-76 m2),small gaps (18-43 m2) and closed canopy.【Result】With the increase of gap area,the DBH,tree height,crown width and crown length of 4-year-old and 12-year-old sapling trees of A.sinensis increased,leaf length,width,average single leaf area and specific leaf area decreased,while ratio of length to breadth increased gradually with significant differences (P<0.05).The basal diameter,length and branch number of first-order branches of both saplings were increased with increasing gap area,while the branching angles of first-order-branches were decreased.The biomasses of leaves,branches,trunks,root and whole-plant increased with the increase of gap area,indicating that large gaps were conducive to promote the growth and development of sapling trees.The insufficient light under canopy inhibited the growth of sapling trees and biomass accumulation.【Conclusion】The effects of gap size on planted saplings can last for a long period.Large gap size is beneficial to growth and biomass accumulation of A.sinensis saplings,while small gap size and under canopy inhibit growth. |
| Key words: gap artificial regeneration Aquilaria sinensis biomass accumulation |
