华山松腐烂病发生与林分条件的关系

Study on the Relationship between Stand Condition and Occurrence of Pinus armandi Canker

华山松腐烂病是华山松林的主要病害，据调查，会泽县华山松林分平均受害率高达７１５％。为了及时防治该病害，对林分所处的海拔高度、坡向、坡位、林分结构、林分郁闭度、树龄、树皮含水率等因子下的感病情况开展了研究。结果表明：处于海拔２７００ｍ以上地段的林分发病重；西坡比东坡发病重；丫口比山脚严重；纯林比混交林发病率高；林分郁闭度在０６以上的发病重；树龄在１０年以上发病严重，受其他病虫危害的比未受危害的严重。

Pinus armandi canker caused by Cytospora pini Ehrenb.was the main disease in Pinus armandi forests, 715% of the whole Pinus armandi forests in Huize county was damaged by Cytospora pini Ehrenb.The relationships between elevation,exposure, slope site ,stand structure, shade density, tree age,water content of bark and occurrence of Pinus armandi canker have been studied.The results of study indicated as following aspects:The disease occurrence in Pinus armandi stand with the elevation higher than 2 700m was severe.The disease occurred in west slope, mountain-gap,pure forests was severer than east slope, the foot of mountain and mixed forests respectively.The disease occurrence in Pinus armandi stand with shade density higher than 06,tree age higher than 10 years and damaged by other disease and pests was severe.