杉木炭疽病空间格局及其变化研究

Spatial pattern and variance of the Chinese fir anthracnose Glomerella cingualta

对杉木炭疽病空间格局类型及其变化规律研究结果表明 ,杉木炭疽病在林间呈聚集分布 ,林间小生境异质性是其空间聚集分布的主要原因 ;随林龄增长 ,其聚集程度下降 ,7～ 8年生林分与 5～ 6年生林分聚集程度差异显著 ,大量病原孢子存在及林分生长不良等导致林分中该病大发生 ;不同立地条件由于林分生长势不同导致抗病性差异 ,这是杉木炭疽病空间分布类型不同的主要原因 ;不同坡位杉木炭疽病种群均为聚集分布 。

The spatial pattern and variance of Chinese fir anthracnose Glomerella cingualta were studied. The results show that the Chinese fir anthracnose is distributed in aggregate pattern and the environment heterogeneity is the reason for its aggregation. The aggregation decreases with the increase of stands age. The stands at 7～8 years of age is different from those at 5～6 years of age by the reason that the disease occurred severely owing to the existing mass bore and forest ill growth. Different anti infections in different site classes for their different growths is the major factor for different spatial patterns of the disease, but the aggregation indexes are nearly in different positions on slope.