速生杨不同修枝强度对胸径和树高生长量的影响
2016-01-06李强
速生杨不同修枝强度对胸径和树高生长量的影响
李强
(凤城市边沟林场,辽宁 丹东 118100)
摘要基于速生杨中黑防经营技术,进行了不同修枝强度对胸径和树高生长量的影响试验,结果表明:采用中度修枝强度有利于提高速生杨胸径生长量和立木蓄积量,而弱度修枝和重度修枝强度与中度修枝相比,无论树高还是胸径,均相对减少,冠幅随修枝强度的变大而减小,冠幅面积依次为未修枝>轻度修枝>中度修枝>重度修枝。掌握适宜的修枝强度在提高树干圆满度的同时,能够提高立木蓄积量及优质木材率。
关键词速生杨;不同修枝强度;胸径生长量;树高生长量
收稿日期:2015-05-22
作者简介:李强(1960-),男,辽宁凤城人,助理工程师,从事林业管理工作.
中图分类号:S792.11
文献标识码:A
doi:10.13601/j.issn.1005-5215.2015.07.020
AbstractThe effects of different pruning intensities on DBH and height growth of Populus deltoides×P. cathayana based on its silviculture technology were studied. Result shows that using moderate intensity pruning is in favor of improving DBH growth and growing stock; compared with moderate pruning intensity, tree height & DBH of weak & severe pruning all reduce; crown decrease with the increase of the pruning intensity; the descending order of crown area is no pruning> mild pruning> moderate pruning> severe pruning. Therefore, optimal pruning intensity can not only improve the trunk crown, but also increase the volume of standing tree and the quality of wood.
EffectsofDifferentPruningIntensitiesonDiameterand
HeightIncrementofFast-GrowingPoplar
LiQiang
(BiangouForestFarm,FengchengCity,Dandong118100,China)
Keywordsfast-growingpoplar;differentpruningintensities;DBHgrowth;heightgrowth
速生杨生长速度快,轮生枝量大,树冠和树高相对慢生树种占据树高的比例较高。在自然整枝的情况下,轮生枝不易枯萎脱落,且随着树冠的生长,轮生枝也在加粗生长,如果不及时采取人工修枝措施,在轮生枝处随着树干生长会形成较大的死节,直接影响到树干通直度、圆满度和木材质量。除此之外,在不采取修枝条件下,由于树冠枝量过密,影响透风透光度,产生衰弱枝,不仅不能有效地进行光合作用,反而会争夺和消耗树体养分。合理的修枝要求是要正确掌握速生杨修枝生理节奏,促进树干的圆满度、增加林分质量和优质材的蓄积量。所以速生杨修枝强度是速生杨营林研究的重点,也是目前林业研究的一项重要内容。……p>
