【摘要】 对安徽江淮地区松材线虫病的发病率 (或枯死率 )与林分蓄积量损失关系的调查与分析 ,结果表明 :该病害在 1 4年生以上的松林 ,若每年发病率或枯死率保持在 7%以下、并呈均匀状态分布和及时防治的条件下 ,对林分主伐期的蓄积量无不良影响 ;当年枯死率上升至 7%以上时 ,发病林分蓄积量开始下降。此外 ,病株枯死率在林间的不同分布型对蓄积量损失也有很大影响 ,其损失规律是 :片状分布 >块状分布 >簇状分布 >星状分布。对于不同的枯死率或分布型的发病林分 ,在防治上应采取相应的策略。更多还原

【Abstract】 s:The influence of pine nematode on the volume increment percent was researched in Anhui province masson pine (Pinus massoniana Lamb.) plantations.The results showed that there was no diminishment in final stand volume when incidence of the disease was less than 7% each year, and the disease plants had been well distributed and sanitation was made in time. However,loss of stand timber in disease areas occurred when the incidence of disease was more than 7% each year.Furthermore the loss of stand timber varied with the distributing types of disease plants in forest stand.更多还原