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The papers a Western. Region-based forest inventory data, based on a model of the relationship between the forest stock volume and forest biomass, the Western. Forest 301 and 303 forest forest biomass and productivity estimates estimated average productivity of forest productivity, forest biomass and research different stand age, site conditions and forest types were estimated. Target constructed based on the of forest subcompartment level of forest productivity evaluation index system, the index system to the status of forest productivity goals, including from the two aspects of the status of forest growth and forest natural conditions, contains a total of five indicators, for the first time in the forest in small classes level forest productivity evaluation index system, to determine the reference value, weights and the index worth calculation method, evaluation of the 301 and 303 dominant trees of the forest stand growth. The results show that the study forest stand total biomass 5136417t, total net productivity 662,726.60 t / a the the stand unit area average biomass 87.84t/hm2, the unit area average productivity 1.69t/hm2 · a, which as cloud fir forests of the dominant tree species per unit area biomass below the national level and the level of Sichuan Province, the research forest age structure and site conditions are not ideal. The calculation method to eliminate the forest type, age, site conditions, stand density, and many other factors, the data sources are easier to obtain and less authoritative. The research results show that the dominant tree species in 301 forest productivity evaluation index was 0.59 points, the dominant tree species in 303 forest productivity evaluation index was 0.7 points, both in the level of productivity in general. 301 forest growth is not good the dominant tree species stand most of the mature forest and mature forest, and these stand site conditions are not ideal, should strengthen forest saplings planted sanitation felling of existing trees, to improve productivity. 301 forest advantage of the species small class productivity situation is not ideal, mostly in productivity generally and poor grades, compared with 301 of the 303 forest level of productivity of the dominant tree species in small classes slightly better, although the forest anthropogenic interference with the situation is more serious, but due to the forest the degree of accessibility than 301 forest by anthropogenic interference with the situation is not serious. The research results show that the forest productivity evaluation index system and evaluation method is simple to understand, easy access to data, easily and quickly.
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