Study On Sustainable Management Of Spruce-fir Mixed Stands Of Coniferous And Broad-leaved Trees

Based on stands-level forest ecosystem, referring intensive management method of natural mixed uneven-aged stands—control method, the mixed stands of coniferous and broad-leaved trees, in which spruce and fir are dominant species, were studied in this thesis;and explored sustainable management model on forest ecosystem level about economy, ecological environment and society.Control method were applied to natural mixed uneven-aged stands at the first time in China, and its inventory method were improved. Through analyzing management regulation results, it put forward the optimal species composition of spruce-fir mixed stands, and then research problem about the optimal stand structure and the maximum stand volume increment. At the same time, compared to dahurian Lanch pure plantation on economical value and ecological value. Finally, the sustainable problem of ecological and environment were analyzed, include forest ecosystem productivity, soil condition, biodiversity, conserving water head, water and soil conservation and maintaining ecological balance etc.The research results showed: spruce-fir mixed uneven-aged ecosystem managed in intensive method, its productive power and dominance were developed, the economic needs were met, environment and social effect were assured, so sustainable management of stands-level forest ecosystem were realized. This research not only provided management technology and method for the mixed uneven-aged stands of coniferous and broad-leaved trees in Changbai mountains, also it have important referring value on the mixed uneven-aged stands management in other area.