西南桦红椎混交林的生长动态及林木形质分析  

Growth dynamics and tree form quality of mixed Betula alnoides-Castanopsis hystrix plantation

作　　者：唐继新[1,2] 朱雪萍 贾宏炎 曾冀[1] 郭文福[1] 黄德卫[1] TANG Jixin;ZHU Xueping;JIA Hongyan;ZENG Ji;GUO Wenfu;HUANG Dewei(Experimental Center of Tropical Forestry,Chinese Academy of Forestry,Pingxiang 532600,China;Guangxi Youyiguan Forest Ecosystem Research Station,Pingxiang 532600,China)

机构地区：[1]中国林业科学研究院热带林业实验中心,广西凭祥532600 [2]广西友谊关森林生态系统国家定位观测研究站,广西凭祥532600

出　　处：《南京林业大学学报（自然科学版）》2022年第1期97-105,共9页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家重点研发计划(2016YFD0600604-01)。

摘　　要：【目的】探索西南桦与红椎"丛状行间"同龄混交林的生长动态和树干形质特征,为其大径材培育提供参考。【方法】以11年生西南桦与红椎"丛状行间"同龄混交林为对象,选取9株西南桦和10株红椎样木进行树干解析,分析混交林不同树种的生长动态、径阶蓄积构成、干形、冠高比和树干分杈率等。【结果】西南桦平均木和优势木的胸径生长速生期(连年生长量>1.0 cm)分别在第3~7年和第3~9年;红椎平均木的胸径生长速生期在第4~8年,优势木胸径生长速生期从第3年开始,直至第11年仍未结束。西南桦平均木和优势木的树高生长速生期(连年生长量>1.0 cm),分别在第1~7年和第1~8年;红椎平均木的树高生长速生期主要在第3~7年,优势木树高的生长速生期在第1~7年。西南桦平均木和优势木单株材积的生长速生期(连年生长量>0.01 m;)起始时间分别在第6年和第5年,二者直到第11年仍未结束。在造林后11年内,红椎平均木单株材积的生长量仍处于缓慢增长期。从第4年起,西南桦平均木胸径、树高和单株材积的总生长量开始显著高于红椎平均木对应生长量(P<0.05);西南桦优势木胸径、树高和单株材积的总生长量分别从第5、8、5年开始显著高于红椎优势木对应总生长量(P<0.05)。二元材积模型(V=a×10^(-4)×D^(b)×H^(c))对西南桦与红椎的单株材积拟合及预测效果较好。在11年生混交林中,西南桦和红椎的径阶蓄积分布近似正态分布,西南桦和红椎优良级干形的林木比率分别为67.71%和97.31%,两树种树干分杈率均低于6.0%。【结论】在中幼龄期,西南桦处于混交林上层。西南桦与红椎的"丛状行间"同龄混交经营,有利于塑造西南桦与红椎的优良树干形质和林木生活力。西南桦与红椎优势木的胸径和树高生长速生期比其平均木的速生期长。【Objective】This study explored the growth dynamics and tree form quality of a mixed Betula alnoides-Castanopsis hystrix plantation with row cluster and the same age.This was carried out to provide management reference for large-diameter timber cultivation of the mixed plantation.【Method】An 11-year-old mixed plantation was adopted as the research object.Nine and ten sample trees of species B.alnoides and C.hystrix,respectively,were selected for stem analysis.The growth dynamics,diameter class accumulation composition,stem form,crown height ratio and stem branching ratio of different tree species in the plantation were analyzed.【Result】The rapid stage of diameter at breast height(DBH)growth(annual growth amount>1.0 cm,the same below)of average and dominant trees of B.alnoides occurred in the 3 rd to 7 th and 3 rd to 9 th years,respectively.The DBH rapid-growth period of the average trees of C.hystrix occurred in the 4 th to 8 th year,and the DBH of dominant trees of C.hystrix occurred from the 3 rd year;in the 11 th year,this was still on going.Tree height rapid-growth period of average and dominant trees of B.alnoides occurred during the 1 st to 7 th and 1 st to 8 th years.The rapid-growth period of tree height of average trees of C.hystrix mainly occurred in the 3 rd to 7 th year,while for the dominant trees of this species occurred in the 1 st to 7 th year.For B.alnoides,the rapid-growth periods of a single volume of average and dominant trees commenced in the 6 th and 5 th year,respectively;in the 11 th year,this was still on going.For C.hystrix,in the first 11 years of afforestation,the growth of the single volume of average trees was still in the slow stage.From the 4 th year,the total growth of DBH,tree height,and single volume of average trees for B.alnoides were significantly higher than the total growth of the average trees of C.hystrix(P<0.05).The total growth of the DBH,tree height,and single volume of the dominant trees for B.alnoides were significantly higher than the counterparts for C.hy

关 键 词：西南桦 红椎 混交林 生长动态 林木形质 

分 类 号：S757[农业科学—森林经理学]