文献类型：期刊文献

中文题名：不同林窗大小对杉木林下闽楠个体生长和植株构型的影响

英文题名：Effects of different gap sizes on individual growth and plant configuration of Phoebe bournei under Chinese fir forest

作者：丁业新[1,2] 李家彧[1,2] 厉月桥[1,2] 王丽云[1,2] 喻龙华[1,2] 陈家堂[1,2] 宋连生[1,2] 邓煌蔚[1,2]

第一作者：丁业新

机构：[1]中国林业科学研究院亚热带林业实验中心,江西新余336600;[2]生物多样性保护与资源利用江西省重点实验室,江西新余336600

年份：2025

卷号：47

期号：6

起止页码：1549-1558

中文期刊名：江西农业大学学报

外文期刊名：Acta Agriculturae Universitatis Jiangxiensis

收录：;北大核心:【北大核心2023】；

基金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020MB004);“十四五”国家重点研发计划项目(2022YFF1303003-02)。

语种：中文

中文关键词：闽楠;杉木;林窗;构型

外文关键词：Phoebe bournei;Chinese fir;forest gap;structural shape

分类号：S792.24

摘要：【目的】林窗会调控林分环境中光、温度、水分等资源的再分配,从而影响林下幼苗的生长。为揭示林窗面积调控对杉木(Cunninghamia lanceolata)林下套种闽楠(Phoebe bournei)生长发育的影响。【方法】以2年生闽楠幼苗为研究对象,设置4 m×4 m(T1)、8 m×8 m(T2)、12 m×12 m(T3)杉木皆伐样地,另以8 m×8 m(CK)不处理林分作为对照,进行林下闽楠补植试验,4年后测量并分析闽楠生长、枝叶根生物量、分枝构型和根系构型指标。【结果】(1)不同大小林窗处理下闽楠在树高和胸径方面表现出极显著差异(P<0.01),在枝下高方面表现出显著差异(P<0.05),其中树高、胸径、冠幅均在T2处理下达到最高,分别比对照组提升了44.9%、51.3%和15.2%;(2)T2处理下,林冠上层和中层枝叶生物量、土层0~20 cm和20~40 cm深度根生物量达到峰值,分别较对照提升了109.3%、67.4%、30.0%、56.7%、206.9%和331.3%,且在土层0~20 cm和20~40 cm深度根系生物量分别表现出显著(P<0.05)和极显著差异(P<0.01);(3)T2处理下,林冠上层的基径,中层和下层的二级枝分枝数达到峰值,分别比对照提升了9.1%、30.5%和55.3%,其中上层二级枝基径和中层二级枝分枝数表现出显著差异(P<0.05);T3处理下,林冠上层分枝数、一级枝基径、中层分枝数、下层分枝数和枝长分别比对照组提升了79.7%、10.6%、68.2%、58.3%、12.0%和28.7%;(4)T2处理下,0~20 cm土层深度内根表面积,20~40 cm土层深度内根长、根尖数,40~60 cm土层深度内根长、根尖数分别较对照提升了92.7%、136.0%、79.2%、61.0%和44.6%。T3处理下,0~20 cm土层深度内根长、根尖数,20~40 cm土层深度内根体积,分别较对照提升了80.5%、127.4%和231.8%。【结论】T2处理下,杉木林下闽楠的树高、胸径、冠幅、枝下高、一二级分枝数、分枝角、基径、枝长、叶生物量、枝生物量以及根系各指标综合表现最佳。林窗处理可有效提升闽楠幼苗期的生长发育,能够显著促进闽楠的生长和构型建成。
[Objective]Gap will regulate the redistribution of light,temperature,water and other resources in the forest environment,thus affecting the growth of seedlings under the forest.This study aims to reveal the influence of gap area regulation on the growth and development of Phoebe bournei interplanting under Chinese fir.[Method]Taking 2-year-old Phoebe bournei seedlings as the research object,three clear-cut Chinese fir sample plots with spacing configurations of 4 m×4 m(T1),8 m×8 m(T2),and 12 m×12 m(T3)were established.Additionally,an untreated 8 m×8 m stand(CK)was set as the control group to conduct an understory Phoebe bournei supplementary planting experiment.After 4 years,the growth,branch and root biomass,branching configuration,root configuration of Phoebe bournei were measured and analyzed.[Result](1)There were extremely significant differences in tree height and breast diameter of Phoebe bournei under different gap sizes(P<0.01),and significant differences in branch height(P<0.05),among which the tree height,breast diameter and crown width reached the highest under T2 treatment,which were 44.9%,51.3%,and 15.2%higher than those of the control group,respectively;(2)Under T2 treatment,the biomass of branches and leaves in the upper and middle layers of the canopy,and the biomass of roots in the depth of 0-20 cm and 20-40 cm reached the peak,which were 109.3%,67.4%,30.0%,56.7%,206.9%and 331.3%higher than those of the control,and the root biomass showed significant(P<0.05)and extremely significant difference(P<0.01)at the depth of 0-20 cm and 20-40 cm,respectively;(3)Under T2 treatment,the basal diameter of the upper layer,the number of secondary branches in the middle layer and the lower layer of the canopy reached the peak,which were 9.1%,30.5%and 55.3%higher than those of the control,and the basal diameter of the secondary branches in the upper layer and the number of secondary branches in the middle layer showed significant differences(P<0.05);Under T3 treatment,the number of upper branches,primary branch base diameter,middle branch number,lower branch number,primary branch base diameter and branch length of the canopy were 79.7%,10.6%,68.2%,58.3%,12.0%and 28.7%higher than those of the control group;(4)Under T2 treatment,the root surface area in 0-20 cm soil depth,root length and root tip number in 20-40 cm soil depth,root length and root tip number in 40-60 cm soil depth were 92.7%,136.0%,79.2%,61.0%and 44.6%higher than those of the control;Under T3 treatment,the root length,root tip number in 0-20 cm soil depth and root volume in 20-40 cm soil depth increased by 80.5%,127.4%and 231.8%respectively compared with the control.[Conclusion]Under T2 treatment,the comprehensive performance of tree height,breast diameter,crown width,height under branches,number of primary and secondary branches,branch angle,basal diameter,branch length,leaf biomass,branch biomass and root system was the optimal.Gap treatment can effectively promote the growth and development of Phoebe bournei in seedling stage,and can significantly promote the growth and configuration of Phoebe bournei.