樟子松枯梢病损失估测与防治指标

在黑龙江省尚志国有林场管理局樟子松枯梢病发病区内，分别病情率级和立地条件，采用均匀分布、典型整群抽西半球的样地调查和树干解析的方法，明确了各病情等级对高生长、径生长、材积生长的影响，从而确定了病情指数与材积损失量、损失率的相关数律，建立了樟子松枯梢病对材积损失的估测模型。并以此推导出了相应的经济危害允许水平和防治指标。

Determination of the Loss and Control Index of Shoot-blight of Pinus slyvestris var. mongolica

The representative plots were chosen and established in the areas where shoot-blight of Pinus sylvestris var. mongolica Litv. occurred in Shangzhi City of Heilongjiang Province, according to different disease grades and sites. By the methods of uniform distribution, typical population sampling and stem analysis, the influences of different disease grades on height growth, diameter growth and volume growth were determined, and the correlation law between volume loss amount, loss rate and disease index were confirmed. The loss assessment model was set up by regression analysis of different type of curves and the corresponding models of economic injury and control index were also calculated.