修枝对欧美107杨木材生长量的短期影响  

Short Effects of Pruning on Growth of Poplar(Populus×euramericana cv. ‘74/76')

作　　者：陈森锟[1] 尹伟伦[1] 刘晓东[1] 夏新莉[2] 孙尚伟[1] 

机构地区：[1]北京林业大学教育部森林培育与保护重点实验室,北京100083 [2]北京林业大学生物与技术学院,北京100083

出　　处：《林业科学》2008年第7期130-135,共6页Scientia Silvae Sinicae

基　　金：农业部科技成果转化项目(05EFN217100430)

摘　　要：As a basic measure for forest management,pruning has an important impact on the tree trunk shape,wood qulity,etc. At present,in the process of growing fast-growing and high-yielding plantation,afforestation was took into account,whereas management after planting was ignored,which had much detrimental effect on woodland’s quality and productivity. The paper studied the topic to find a scientific pruning model that could provide a guideline for the management in forest production. The plantation and the intercropping of poplar-crop were pruned in four different levels in Hebei and Shandong province. The levels were respectively light p1 (1/6 crown was pruned),medium p2 (2/6 crown was pruned),strong p3 (3/6 crown was pruned),heavy p4 (4/6 crown was pruned) and the control (unpruned). Heights and diameters at breast height(DBH) were measured. Diameter growth and cutting-area increment in one year from ten parsed trees were counted. The volume growth of trunk (below 9 m) was calculated. The results were:1) the difference of relative growth rate for different pruning treatment was not significant (P<0.05),which demonstrated the nutrition for height growth came from the branches and leaves of the top crown; 2) The difference of relative growth rate of DBH was significant(P<0.01). That is,the greater of pruning intensity,the smaller relative growth in the DBH. 3) The stem growth of parsed disk at different height was fluctuant among the different treatments. From stem base (0.0 m) to 9 m height of the trunk,the stem increase of the lower half reduced along with the increase of pruning intensity,while the growth of the upper half in pruning trees was bigger than that of non-pruning ones. 4) The difference of volume growth rate for different treatments was significant,all of the pruning treatments were bigger than the control. The medium p2 had the biggest growth,and the order was CK<p4<p1<p3<p2,which suggested that reasonable pruning can improve the growth of volume. However an excessive pruning reduced volume growth. 5As a basic measure for forest management,pruning has an important impact on the tree trunk shape, wood qulity, etc. At present, in the process of growing fast-growing and high-yielding plantation, afforestation was took into account, whereas management after planting was ignored, which had much detrimental effect on woodland＇ s quality and productivity. The paper studied the topic to find a scientific pruning model that could provide a guideline for the management in forest production. The plantation and the intereropping of poplar-crop were pruned in four different levels in Hebei and Shandong province. The levels were respectively light pl （1/6 crown was pruned）, medium p2 （2/6 crown was pruned）, strong p3 （3/6 crown was pruned）, heavy p4 （4/6 crown was pruned） and the control （unpruned）. Heights and diameters at breast height（DBH） were measured. Diameter growth and cutting-area increment in one year from ten parsed trees were counted. The volume growth of trunk （below 9 m） was calculated. The results were ： 1 ） the difference of relative growth rate for different pruning treatment was not significant （P 〈 0.05）, which demonstrated the nutrition for height growth came from the branches and leaves of the top crown; 2） The difference of relative growth rate of DBH was significant（ P 〈 0.01 ）. That is, the greater of pruning intensity, the smaller relative growth in the DBH. 3） The stem growth of parsed disk at different height was fluctuant among the different treatments. From stem base （0.0 m） to 9 m height of the trunk , the stem increase of the lower half reduced along with the increase of pruning intensity, while the growth of the upper half in pruning trees was bigger than that of non-pruning ones. 4） The difference of volume growth rate for different treatments was significant, all of the pruning treatments were bigger than the control. The medium p2 had the biggest growth, and the order was CK 〈 p4 〈 p1 〈 p3 〈 p2, which suggested that reasonab

关 键 词：修枝 杨树 生长率 材积 尖削度 

分 类 号：S753.51[农业科学—森林经理学]