不同修枝强度对杉木无节材生长的影响  

Effects of Different Pruning Intensities of Stems on Growth of Knot-free Timber of Cunninghamia lanceolata

作　　者：张钦 

机构地区：[1]福建省松溪国有林场,福建南平353500

出　　处：《防护林科技》2013年第10期13-16,共4页Protection Forest Science and Technology

摘　　要：对不同修枝强度下杉木林的生长及其与时间的相关性进行了研究,结果表明:修枝后4a,杉木林的平均树高、平均胸径以及平均单株材积均随着修枝强度的增大而下降,枝下高随着修枝强度的增大而升高,修枝后7a至13a,杉木林的平均树高、平均胸径以及平均单株材积均随着修枝强度的增大先升高后下降,13年后,修枝强度为1/2的处理,平均树高为14.733±0.208m,平均胸径为17.733±0.289cm,平均单株材积为0.178±0.008cm3,为最佳修枝强度;其平均树高与时间的相关模型为y=0.014 2 x-0.017 1,R2=0.946 5,平均胸径与时间的相关模型为y=1.138 7 x+3.816 7,R2=0.967 2,平均单株材积与时间的相关模型为y=0.848 9 x+4.099 1,R2=0.970 7,平均枝下高与时间的相关模型为y=0.530 8 x+0.752 2,R2=0.975 1;各项指标与处理时间的相关性均达到极显著水平(P<0.01)。The growth of Cunninghamia lanceolata under different pruning intensities of stems and its correlation with time were studied. Result shows that ： the average tree height,average DBH ＆ average individual volume of Cunninghamia lanceolata decrease with the increase of pruning intensity four years after pruning;the under branch height rise with the increase of pruning intensities. The average tree height,average DBH ＆ average individual volume of Cunninghamia lanceolata show a downward trend after the first rise with the increase of pruning intensity from 7 to 13 years after pruning ＆ 13 years after pruning,in the treatment with pruning intensity for 1/2, the average tree height is 14. 733±0. 208 m;the average DBH is 17. 733±0. 289 cm;the average individual volume is 0. 178±0. 008 cm3 ,which is the optimal pruning treatment;the correlation model of average tree height ＆ time is y=0. 014 2 x=0. 017 1,R2 =0. 946 5;the correlation model of average DBH ＆ time is y=1. 138 7 x＋3. 816 7,R^2 =0. 967 2; the correlation model of individual volume ＆ time is y= 0. 848 9 x±4. 099 1 ,R2 = 0. 970 7;the correlation model of under branch height ＆ time is y=0. 530 8 x＋0. 752 2,R2^ =0. 975 1;the correlation of all indexes ＆ treating time reach extremely significant level（P〈0.01）.

关 键 词：杉木 修枝强度 生长 无节材 

分 类 号：S753.518[农业科学—森林经理学]