| This article takes the object of study by the Western Sichuan Miyaluo area's forest, to research the forest sustainability and fir forest community features.(1) The article builds a state evaluation index system of sustainable forest by forest resources quality, forest resources utilization and forest interference divided into the object, category object, rule, category, and indicator five hierarchies, rule hierarchy contain naturility of forest, maintenance ability of forest productivity, structure integrity and stability of forestry community three rules, category hierarchy contain naturility of forest, status of stand growth, site quality et al.9 categories, indicator hierarchy contains a total of 22 indicators, then proposes evaluation method, and carries on the confirmation by the Miyaluo area NO.301 forest farm as well as NO.303 forest farm to assessment method's feasibility. The results indicate that, in general, both forests are classified as Classl in sustainability. The score of sustainability in the No.303 forest fam is 0.69, slightly better than the No.301 forest farm, which scores 0.67. The No.303 farm is better in resource quality, while the two farms get similar results in the resources utilization and interference aspects. In addition, the application process shows that, the evaluating indicators are simple, the data is easy to collect, the computing method is simple and direct, and the scientific approach is well founded. As a result, the proposed evaluation system and the assessment method are feasible and applicable.(2) The study also researches the relationship between community characteristics and ecological factors of fir forest, on the basis of sub-compartment data, to seek for the suitable habitat of fir forest community and to sort the ecological factors by their influence on fir tree forest community. Results show that, there were significant dynamic variations of the height, DBH and the volume versus different altitudes. A single peak occurred in the curve of the height versus the altitude, so did the curve of the DBH versus the altitude. However, the dynamic variation of the volume versus altitude fluctuated significantly. The characteristics of the micro-environment and the human disturbance would be responsible for such variations. The suitable habitat of the fir forest was at an altitude ranged from 3500 to 4000 m a.s.l, with a soil depth from 50 to 79 cm, and a slope degree from 40°to 49°. At the same time, the fir trees preferred the half shady side of the slope, or the superior shady side of the mid-slope or top-slope. A significantly large proportion of the fir forests concentrated within an altitude range from 3800 to 3900 m a.s.l. In addition, slope position was the most fundamental ecological factor that affects the fir forest community characteristic in this region, followed by soil depth, slope, and aspect. This study reveals the relationship between ecological factor and forestry community through the analysis on plants distribution and growth condition of forest cover, which contributes to the scientific approach of forest management.
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