不同修枝强度对马尾松幼林生长的影响  

Effects of Different Pruning Intensities on Growths of Pinus massoniana Young Plantations

作　　者：唐生森 尹明善[2] 蒙春江 覃永康 潘政顶 杨章旗[1] Tang Shengsen;Yin Mingshan;Meng Chunjiang;Qin Yongkang;Pan Zhengding;Yang Zhangqi(Guangxi Forestry Research Institute,Nanning,Guangxi 530002,China;Huashan Forest Farm,Huanjiang,Guangxi 547100,China)

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]环江毛南族自治县华山林场,广西环江547100

出　　处：《广西林业科学》2024年第6期763-768,共6页Guangxi Forestry Science

基　　金：广西院士后备人才培育项目(桂AD19254004);广西优良用材林资源培育重点实验室自主课题(22-A-01-04);广西八桂学者专项(2019A026);中央财政林业科技推广示范项目([2022]TG22号)。

摘　　要：为给广西马尾松(Pinus massoniana)无节材培育和优质木材产出提供参考,以6年生马尾松为研究对象,设置不同修枝强度和枝桩保留长度,探讨修枝对马尾松生长的影响。结果表明,修枝后第1年和第2年,不同修枝处理的马尾松枝下高均高于对照。修枝后第1年,不同修枝处理的马尾松胸径、树高和单株材积年生长量均低于对照。修枝后第2年,不同修枝处理的马尾松胸径和单株材积年生长量均低于对照,不同修枝处理的马尾松树高年生长量均高于对照。修枝后2年,不同修枝处理的马尾松胸径和单株材积总生长量均低于对照;除轻度修枝处理外,中度修枝处理和重度修枝处理的马尾松树高总生长量均高于对照。修枝后第1年和第2年,随枝桩保留长度增加,马尾松伤口愈合率均降低;随时间增加,不同枝桩保留长度的马尾松伤口愈合率均升高。修枝后第1年和第2年,随枝桩保留长度增加,马尾松枝桩环剥率均呈先升后降的趋势;随时间增加,不同枝桩保留长度的马尾松枝桩环剥率均降低(2.0 cm除外)。枝桩容易枯死缩水形成环剥死节。在马尾松幼林修枝抚育中,可采用平修法(不保留枝桩),修枝强度为树高的40.0%和50.0%,修枝间隔期为2~3年。To provide references for cultivation of knot-free Pinus massoniana timbers and production of highquality timbers in Guangxi,taking 6-year-old P.massoniana as research objects,effects of pruning on growths of P.massoniana were explored by setting different pruning intensities and branch retention lengths.Results showed that in the first and second year after pruning,clear bole heights of P.massoniana under different pruning treatments were higher than that of control.In the first year after pruning,annual growths of DBHs,tree heights and individual volumes of P.massoniana under different pruning treatments were lower than those of control.In the second year after pruning,annual growths of DBHs and individual volumes of P.massoniana under different pruning treatments were lower than those of control,while annual growths of tree heights of P.massoniana under different pruning treatments were higher than that of control.2 years after pruning,total growths of DBHs and individual volumes of P.massoniana under different pruning treatments were lower than those of control.Except for mild pruning treatment,total growths of tree heights under moderate and severe pruning treatments were higher than that of control.In the first and second year after pruning,wound healing rates of P.massoniana decreased with increase of branch retention length.Wound healing rates of P.massoniana with different branch retention lengths increased with increase of time.In the first and second year after pruning,branch stripping rates of P.massoniana showed trends of first increase and then decrease with increase of branch retention length.Branch stripping rates of P.massoniana with different branch retention lengths decreased with increase of time(except for 2.0 cm).Branches were prone to die and shrink,forming stripping dead knots.In pruning and tending of young P.massoniana plantations,flat pruning method(without retaining branches),pruning intensites at 40.0%and 50.0%of tree height and pruning intervals of 2-3 years were recommended.

关 键 词：修枝 生长影响 枝桩 马尾松 

分 类 号：S753.5[农业科学—森林经理学]