修枝对连香树林分生长的影响  

Effects of Pruning on the Growth of Cercidiphyllum japonicum

作　　者：戴秀芳 沙红 郭小龙 杜坤 DAI Xiufang;SHA Hong;GUO Xiaolong;DU Kun(Gansu Xiaolongshan Forestry Science Institute,Tianshui Gansu 741022,China;Key Laboratory of Secondary Forest Cultivation GanSu Province,Tianshui Gansu 741022,China;Forest Ecosystem Locational Research Station in Xiaolongshan Tianshui Gansu 741022,China)

机构地区：[1]甘肃省小陇山林业科学研究所,甘肃天水741022 [2]甘肃省次生林培育重点实验室,甘肃天水741022 [3]甘肃小陇山森林生态系统国家定位观测研究站,甘肃天水741022

出　　处：《甘肃林业科技》2021年第3期20-21,78,共3页Journal of Gansu Forestry Science and Technology

基　　金：天水市科技支撑计划项目“珍贵树种连香树种植资源调查与高效栽培技术”(2020-NCK-2322)。

摘　　要：对连香树10龄林分进行不同强度修枝试验,设置固定样地观测,结果表明:保留树冠占1/2树高的重度修枝与保留树冠占2/3树高的轻度修枝较未修枝,修枝年树高生长量分别提高0.60 m、0.52 m,生长率分别提高9.1、8.1百分点;胸径生长量分别降低0.60、0.50 cm,生长率分别降低5.7、4.8百分点;尖削度分别减小8.0、5.9百分点。说明连香树林分修枝促进高生长,减小胸径生长,改进干形。Pruning experiments with different intensities were carried out on 10-year-old stand of Cercidiphyllum japonicum,and fixed sample plots were set up for observation.The results showed that the severe pruning with a retained crown accounting for 1/2 of tree height and the light pruning with a retained crown accounting for 2/3 of tree height were slightly different.The annual tree height growth increased by 0.60 m and 0.52 m respectively,and the growth rate increased by 9.1 and 8.1 percentage points respectively.The growth of DBH decreased by 0.60 and 0.50 cm,the growth rate decreased by 5.7 and 4.8 percentage points,and the taperingnes decreased by 8.0 and 5.9 percentage points respectively.Therefore it showed that pruning of Cercidiphyllum japonicum could promote height growth,reduce DBH growth and improve stem shape.

关 键 词：连香树 修枝 树高 胸径 尖削度 

分 类 号：Q792.189.06[生物学—分子生物学]