松黄叶蜂对油松生长发育的影响

松黄叶蜂 (N eodiprion sertif er)危害油松后 ,油松生长量随着叶蜂种群数量增大而降低。即随着食叶量由 0 .0 0 %～ 1 0 0 % ,年高生长量降低 9.76%～ 41 .71 % ;径生长量减少 1 2 .91 %～ 3 1 .3 2 % ;木材蓄积量减少2 1 .99%～ 5 4.98%。该叶蜂在树冠下枯落物中结茧量分别与食叶量和年高生长量、径生长量、木材蓄积量的损失量有下列线性关系 :食叶量 W=2 1 .5 5 1 8 0 .3 43 2 X,年高生长损失量 Y=-5 .91 3 2 0 .1 3 85 X,径生长损失量 Z=3 .2 881 0 .0 777X,材积损失量 P=4.2 2 48 0 .1 471 X

The Effect of European Pine Sawfly on Chinese Pine Increment

Based on results of the research, Chinese pine was endangered by European pine sawfly( Neodiprion sertifer ), the increment reduced with the increasing of population of the sawfly.When the foliar feeding increment of the sawtly increased from 0.00% to 100%, annual height increment of the pine reduced from 9.76% to 41.76%; diameter breast height increment droped from 12.91% to 31.32%; and stand increment from 21.99% to 54.98%.The linear relations between foliar feeding increment,annual height increment,diameter breast height and stand dincrement were as follows: W (foliar feeding increment)= 21.5518 0.3432 X;Y (annual height increment)=-5.9132 0.1385 X;Z (diameter breast height increment)=3.2881 0.0777 X;P (stand increment)=4.2248 0.1471 X .