Abstract:

Abstract: The analytic hierarchy process and the delphi method were used to set up an index system of forest community health. The methods consist of object hierarchy, rule hierarchy and index hierarchy. The rule hierarchy contains integrity of community structure, stand stability and condition of stand growth, the index hierarchy contains nine indexes, which include canopy density, total coverage of undergrowth and average DBH of constructive species, and so on. Based on the system, the spruce and fir forests were evaluated in 301 forest stations of the western Sichuan forestry bureau with the forest subcompartment as evaluation unit. The results showed that the area proportion of the sub\|health stands was the largest, that of the health stands took the second place, and that of the poor health stands was the smallest. In the spruce forests, area proportion of the healthy stands was 13.82%, and proportion of the sub\|healthy stands was 83.46%, but the poor healthy stands only accounted for 2.71%. In the fir forest, area proportion of the healthy stands, the sub\|healthy stands and the poor healthy stands accounted for 1.46%, 76.03% and 22.51% respectively. At last, the reasons were analyzed for the present forest community health status.

Key words: Key words: forest, health, evaluation