不同强度修枝对杉木木材密度、硬度及无节材比例的影响  

Effect of Pruning with Different Intensity on Wood Density,Hardness and the Ratio of Knot-free Wood in Cunninghamia lanceolata Plantation

作　　者：陈明旭 沙子舟 范少辉 叶代全 马祥庆[1] 何宗明[1] Chen Mingxu;Sha Zizhou;Fan Shaohui;Ye Daiquan;Ma Xiangqing;He Zongming(Chinese fir Engineering Technology Research Center,National Forestry and Grass Bureau,Fujian Agriculture and Forestry University,Fuzhou 350002,P.R.China;Key Laboratory for Bamboo and Rattan,International Center for Bamboo and Rattan;Fujian Yangkou State owned Forest Farm)

机构地区：[1]国家林草局杉木工程技术研究中心(福建农林大学),福州350002 [2]国际竹藤中心竹藤科学与技术重点实验室 [3]福建省洋口国有林场

出　　处：《东北林业大学学报》2023年第8期108-112,共5页Journal of Northeast Forestry University

基　　金：“十四五”国家重点研发项目(2021YFD2201302)。

摘　　要：为揭示修枝对杉木木材密度、硬度及无节材比例的影响规律,采用随机区组设计,在4年生杉木林中开展4种不同修枝强度(分别修除树干直径6、8、10、12 cm位置以下的枝条)处理试验。在修枝后20 a,按照平均标准木法选择不同修枝强度和对照处理标准木进行不同指标测定,研究修枝强度对杉木木材密度、硬度、干形、无节材比例等指标的长期影响。结果表明:修枝强度对杉木木材尖削度有显著影响,未修枝杉木木材尖削度为1.05%,修枝杉木尖削度均小于0.92%,修枝后杉木干形更趋于通直,树干形率增大。不同修枝强度处理杉木木材指标存在差异,修枝降低了杉木木材密度、硬度,但显著提高杉木无节材的比例,不同修枝处理无节材比例比未修枝提高5%~15%。10 cm修枝强度能明显增加无节材比例,但对杉木生长的影响不明显,是值得杉木无节材培育中推广的修枝强度。In order to reveal the effect of pruning on the wood density,hardness and the proportion of knot-free timer of Cunninghamia lanceolata,a randomized block design was used to carry out four different pruning intensities(pruning branches below the trunk diameter of 6,8,10 and 12 cm,respectively)in a 4-a C.lanceolata plantation.After 20-a pruning,according to the average standard wood method,standard woods of different pruning intensity and control treatment were selected for different index measurement.The long-term effects of pruning intensity on the wood density,hardness,stem form and knot-freeratio of C.lanceolata were studied.The results showed that the pruning intensity had a significant effect on the woodtaper of C.lanceolata.The wood taper without pruning was 1.05%,and the wood taper with pruning was less than 0.92%.After pruning,the stem shape of C.lanceolata tended to be straighter and the stem shape rate increased.The wood properties of C.lanceolata with different pruning intensities were different.Pruning decreased the wood density and hardness,but significantly increased the proportion of knot-free wood.The proportion of knot-free wood with different pruning intensities was 5%-15%higher than that of the control.A 10-cm pruning intensity did not significantly affect the growth of C.lanceolata,significantly increased the proportion of knot-free wood,which is popularized model of knot-free wood cultivation for C.lanceolata plantation.

关 键 词：杉木人工林 修枝强度 干形 木材密度 木材硬度 无节材 

分 类 号：S791.27[农业科学—林木遗传育种]