修枝强度对杉木人工林节子属性的影响  

Effects of pruning intensity on the knot attributes in Cunninghamia lanceolata plantations

作　　者：阮颖超 何宗明[1,2] 范少辉 陈志云 马祥庆 董强[1] RUAN Yingchao;HE Zongming;FAN Shaohui;CHEN Zhiyun;MA Xiangqing;DONG Qiang(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Chinese Fir Engineering Technology Research Center,National Forestry and Grassland Administration,Fuzhou,Fujian 350002,China;International Centre for Bamboo and Rattan,Beijing 100102,China;Shaowu Weimin State-owned Forest Farm,Fujian Province,Shaowu,Fujian 354006,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业草原杉木工程技术研究中心,福建福州350002 [3]国际竹藤中心,北京100102 [4]福建省邵武卫闽国有林场,福建邵武354006

出　　处：《森林与环境学报》2024年第4期423-430,共8页Journal of Forest and Environment

基　　金：“十四五”国家重点研发计划项目“杉木大径级无节良材培育技术”(2021YFD2201302)。

摘　　要：研究不同修枝强度对杉木节子属性的影响,对指导提高木材质量、优化林业经营管理等修枝措施具有重要作用。采用随机区组设计,对4年生杉木人工林实施不同修枝强度试验(即每年修枝至树干直径6、8、10、12 cm,直至树干修枝净高度达7 m,未修枝木为对照CK)。修枝22 a后,选取不同修枝强度的平均标准木15株并砍倒,截取7 m以下树干运回实验室,切割了105个节子解析圆盘进行剖析,对节子的长度、直径、角度及健全节和疏松节的长度进行测量并比较其差异。结果表明,节子长度和健全节长度排序均为修枝强度6 cm<8 cm<10 cm<12 cm<CK;节子直径排序为修枝强度8 cm<6 cm<10 cm<12 cm<CK;疏松节长度排序为修枝强度6 cm<12 cm<10 cm<8 cm<CK;节子角度排序为修枝强度8 cm<12 cm<10 cm<6 cm<CK。节子长度和健全节长度均有随修枝强度增加而显著降低的趋势。修枝强度6 cm的节子长度几乎为CK的1/2,其疏松节长度仅为CK的1/4。修枝强度对节子属性的显著影响已持续22 a,4个强度修枝均可有效改善节子属性,修枝强度6、8 cm的修枝效果更佳。因此,在杉木培育过程中,为了获得更小的节子长度、节子直径、健全节长度,可采用修枝强度6、8 cm,且修枝强度6 cm的疏松节长度最小,修枝强度8 cm的节子角度最小。Studying the effects of different pruning intensities on the knot properties of Cunninghamia lanceolata(hereafter called C.lanceolata for short)is crucial for guiding pruning measures to improve wood quality and optimize forestry management.An experiment was conducted on a 4-year-old C.lanceolata plantation using a randomized block design.The trees were subjected to different pruning intensities,with annual pruning until the stems reached diameters of 6,8,10 cm,and 12 cm,and the pruning clear bole height of the stems reached 7 m.Unpruned trees served as the control check.After 22 years of pruning,a total of 15 average standard trees with different pruning intensities were selected and cut down.The stems below 7 m were removed and brought back to the laboratory.A total of 105 knot analysis discs were cut and dissected.The length,diameter,and angle of the knots,as well as the lengths of sound and loose knots,were measured and compared for differences.The results showed that knot and sound knot lengths with pruning intensities were ranked in the following sequence:6 cm<8 cm<10 cm<12 cm<CK.The knot diameter with pruning intensity was ranked in the following order:8 cm<6 cm<10 cm<12 cm<CK.The loose knot length with pruning intensity was ranked in the following order:6 cm<12 cm<10 cm<8 cm<CK.The knot angle with pruning intensity was ranked as follows:8 cm<12 cm<10 cm<6 cm<CK.Both the knot and sound knot lengths tended to decrease significantly with increasing pruning intensity.The knot length with a pruning intensity of 6 cm was almost half that of the control CK,and its loose knot length was only one-fourth that of the control CK.The significant effect of pruning intensity on knot attributes lasted for 22 years,and all four pruning intensities were significant in improving knot attributes,with pruning intensities of 6 cm and 8 cm being the most effective.Therefore,in the process of C.lanceolata cultivation,to obtain a smaller knot length,knot diameter,and sound knot length,pruning intensities of 6 cm and 8 cm can be u

关 键 词：杉木 修枝强度 节子长度 节子直径 节子角度 健全节长度 疏松节长度 

分 类 号：S791.27[农业科学—林木遗传育种] S725[农业科学—林学]