Abstract: Some indexes of temporal and spatial niches of rice sheath blight were measured. The results showed that index of temporal niche breadth of rice sheath blight in the flag leaf (n leaf )was the minimum(0.1994), and in the fourth (n-3) leaf was the maximum(0.5463), it increased following the height of the leaf and sheath of rice descended. Index of vertical spatial niche breadth of rice sheath blight was the minimum on 22, June (0.1250), and the maximum on 22, August(0.7759), it increased following the rice growth. Indexes of horizontal spatial niche breadth of rice sheath blight in different dates were similar. Concepts of niche, niche function and niche breadth were discussed.

Key words: rice sheath blight, niche, niche breadth, niche function

摘要： 测定了水稻纹枯病时间、垂直空间和水平面空间生态位的生态位功能指数和生态位宽度指数，结果表明，在倒1叶上水稻纹枯病的时间生态位宽度指数最小，为0.1994，在倒4叶上的生态位宽度指数最大，为0.5463，整体上随着叶（鞘）位的降低，水稻纹枯病的时间生态位宽度指数增大。水稻纹枯病垂直空间生态位宽度指数在6月22日最小，为0.1250，在8月22日最大，为0.7759，整体上随着水稻的生长，水稻纹枯病的垂直空间生态位宽度指数逐渐增大。各调查时期水稻纹枯病的水平空间生态位宽度指数差异不大。讨论了生态位、生态位功能、生态位宽度等概念的内涵。

关键词: 水稻纹枯病, 生态位, 生态位宽度, 生态位功能