油茶主要病害空间分布格局规律的研究

Spatial distribution pattern of major diseases in Camellia oleifera

应用聚集度指标法、Iwao sM*与M回归模型分析法研究了油茶Camellia oleifera主要病害的空间分布格局。结果表明,油茶叶枯病Pestalotiopsis microspora、炭疽病Colletotrichum gloeospori-oides、煤污病Neocapnodium sp.在油茶林中呈均匀分布;软腐病Agaricodochium camelliae、藻斑病Cephaleuros virescens为聚集分布,聚集原因是由软腐病和藻斑病的生物学特性及环境因素共同作用引起的。Iwao’s回归分析表明叶枯病的分布为均匀分布且病株个体间相互排斥,在油茶林中呈扩散性危害趋势;炭疽病、煤污病、软腐病和藻斑病空间分布的基本成分是个体群,病株个体之间相互吸引,个体群在林中呈均匀分布格局。

Based on aggregation index method and Iwao＇s regressive model analysis（M＊-M regressions）,the spatial distribution patterns of major diseases in Camellia oleifera were examined.It was found that Pestalotiopsis microspora,Colletotrichum gloeosporioides and Neocapnodium sp.distributed uniformly.However,Agaricodochium camelliae and Cephaleuros virescens were of aggregated distribution which might be caused by their biological characteristics and environmental conditions.Moreover,according to Iwao＇s regressions,P.microspora distributed uniformly with spreading trends,and the diseased plants were mutually exclusive.Individual colonies distributed uniformly and were the basic elements for the distributions of Colletotrichum gloeosporioides,Neocapnodium sp.,A.camelliae and C.virescens and the plants infected with these four diseases attracted with each other.