Abstract: By using the principles and methods of niche, the microclimatic niche of rice sheath blight fungus was analyzed. The results showed that the integrative effect of ecological factors light intensity, air temperature, and humidity was higher than the effect of each of the factors, and the combination of light intensity and air temperature had higher effect than the other combinations of the three factors. At the tillering, booting, heading, and waxing stages of rice, the microclimatic niche breadth of the fungus was 0.3112, 0.4012, 0.4326, and 0.7365, respectively, i.e., increased with rice growth, and the microclimatic niche occupied by the fungus was mainly with the low light intensity, low air temperature and high humidity as the prior microclimate type.

Key words: climate warming, phenophase, response, northern China