The Dynamic Change Of Forest Resources And Timber Forest At Dongmen Forestry In Guangxi

Based on Dongmen forestry in Guangxi four (1998,2004,2004 and 2013) forest resources planning and design results for material, analysis of Dongmen forestry in Guangxi land resources, forest resources, timber forest status quo and dynamic change. Combination of the actual production conditions, in order to yield of timber forest, age structure, plantation proportion, recoverable resources structure, age structure and tree species such as six evaluation index, establishing evaluation system and criteria, to evaluate the quality of the timber forest resources. From timber forest sustainable management, give full play to the perspective of forest comprehensive benefits, according to the situation of the amateur timber forest, is put forward from the timber stands the optimization goal, optimization, optimization approaches and measures, put forward the proposal. The main results were as follows:2. Forest value eucalyptus management, which leads to the unreasonable structure of tree species, and other native tree species management to reduce; Young and middle aged forests small proportion, unreasonable structure of age group; Timber yield is low, the low level of overall quality.3. Timber quality score for 60 minutes, each year were 45.93 points, 46.62points,29.95 points,31.86 points. In 2013 than in 1998,2004 for timber quality dropped substantially, but increased than in 2009. Causes Dongmen forestry in Guangxi will most high quality land leased to stora enso company operation, reduces woodland, timber forest decline in quality.4. Timber structure rationality total score of 30 points, the annual scores were 20.32 points,18.55 points,12.9 points,11.79 points, and the rationality of structure score is on the decline. Among them,1998,2004 for timber rationality structure up to a reasonable level, basic reasonable level of 2009,2013 is not reasonable.5.2013 years, unreasonable structure of tree species, timber forest is given priority to with eucalyptus, eucalyptus accounted for 92.69% of timber forest area per unit area yield of eucalyptus 114.4 m after/hm2. Age group structure is unreasonable, timber stands nearly into overmature forest area, mid-maturation forest area, sapling forest area of timber stands with a total area of 65.66%, 13.36% and 65.66%.6. Timber structure to be optimized, from the group layout, variety structure, age structure adjustment after optimization, eucalyptus, pine:precious tree species:other hardwood proportion should be 5:2:2:1. When reach distribution method is Lin, eucalyptus, pine tree and rare tree species and other hardwood, needed to adjust the age of 11 years,41,81,51 years.7. In view of the existing problems, and suggested strengthening tending management, adjust the structure of tree species, more precious tree species and native species,20% is given priority to with formula fertilization, improve the quality of timber forest. Tree species structure adjustment, precious tree species and native species accounted for 20%.