Abstract: In this study, the changes of soil habitat factors of the severely burned forest lands and the unburned forest lands in Greater Xing’an Mountains were monitored for three years to assess soil habitat quality. The corresponding soil quality indices (SQI) were obtained by calculating the memberships and weight values of soil habitat factors. The results showed that, SQI could visually reflect the effect of forest fire on soil quality. However, the obtained assessment results were not consistent due to the different soil habitat factors applied. The results obtained from 12 soil habitat factors showed that the soil habitat quality of burned lands was gradually increased over time. The results obtained from 7 soil functional factors showed that the soil habitat quality decreased slightly after fire, and then increased over time. When 3 obstacle factors were applied, the assessment results showed that soil habitat quality decreased obviously after fire and sharply increased late. Therefore, the obstacle factors should be chosen to assess the quality of forest soil habitat suffering from fire both instantly and after long time (more than 3 years). Such assessment method could reduce the workload for obtaining information of soil habitat factors, and also avoid overestimating the soil habitat quality of burned soil due to the hidden constraint factors. The results of this study could provide useful reference for the management and restoration of burned forest land.

Key words: offshore water of southern Zhejiang, environmental factor., Larimichthys polyactis, resource distribution