The Research Of Assessment Index System And Transformation Model Of Low Quality And Low Efficiency Forest

Forest is an important resource for human survival, and stand quality level determines the level of forest social economic value and ecological value, due to improper afforestation decision, effects of human disturbance and unfavorable natural conditions, resulting in low social economic value and ecological value of low quality and low benefit forest, carries on the transformation to the low quality and low benefit forest, to improve forest quality so as to improve the stand of social economic value and ecological value of the task is the focus of current forestry work. This paper by inefficient low-quality, Yueyang City, Hunan Province Fu Shou state-owned forest farm forest as the research object, using FIR low quality and low benefit of pure forest, defective forest of Cunninghamia lanceolata, low quality and low benefit masson pine pure forest of three different Four aspects the types of a total of 18 plots survey data, from the quality of the stand, stand site condition, ecological function of forest, forest community resistance to build low-quality forest evaluation index system, and the evaluation of the state-owned forest farm of longevity and three types of low quality and low benefit forest. Finally, low-quality forest evaluation grade of different grades of low-quality forest proposed transformation model according to the. Research methods include:brainstorming, expert consultation method and will will be outside the law by combining analytic hierarchy process and application of SPSS software, standard deviation and variance analysis method. The main purpose of this paper is to study the conclusions are as follows:(1) Low quality and low benefit forest evaluation index selection. Through brainstorming method, expert consultation method and in the method, several methods of combining the way of low quality and low efficiency forest evaluation index selection, the selection of quality of the stand, stand, stand, forest group drop resistance, a total of four indicators as determination of low quality and low efficiency forest ecological value and quality of the stand level indicators. The criteria layer, select the include stand average DBH, stand average tree height and stand density, number of trees density, slope, soil depth, soil organic matter, forest productivity, forest carbon sequestration capacity, species diversity, water conservation capacity, the soil and water conservation ability, the degree of disease and insect pests, the degree of human disturbance, a total of 14 indicators.(2) Different types of low quality and low benefit forest. The forest quality index in Chinese fir low quality and low efficiency of pure forest of Pinus massoniana low quality and low benefit forest stand average DBH, mean stand height and canopy density of little difference in 2～3 level, fir defective forest seriously low, at a level; at the stand density of Cunninghamia lanceolata on defective forest is much higher than those of Chinese fir low quality and low efficiency of pure forest of Pinus massoniana low quality and low efficiency of pure forest, but three forest in a level state density in a certain extent, affect the stand average DBH, stand average height and canopy density, stand site index of Chinese fir low quality and low efficiency of pure forest of Masson Pine and low quality and low efficiency of pure forest slope Pure and pure Chinese fir and slightly low level in and between degree and thickness of soil indexes had no significant difference in Grade 1 and 2, fir defective forest in a level state, the soil organic matter content, while in Grade 1, but Chinese fir defective forest to lower than that of Chinese fir low quality and low benefit of pure forest of Pinus massoniana low quality and low efficiency of pure forest, soil organic matter content and soil thickness in a certain extent was positively correlated; forest ecological function index of Chinese fir defective forest stand productivity is very low in the 1 state, carbon sequestration capacity in 1～2 grade, but the biological diversity of the high degree of Chinese fir low quality and low efficiency of pure forest in grade 4, and low quality and low efficiency forest of Pinus massoniana low quality and low efficiency Lin Zailin Productivity little difference in Level 3 state, solid carbon in 2 levels, low quality and low benefit masson pine pure forest in species diversity is low in grade 2 and 3, soil and water conservation and water conservation capacity is very low, and Chinese fir low quality and low benefit of pure forest in between grade 1 and 2, indicating that the interaction between the forest ecological function of each index is not. In the forest community resistance force index, three kinds of forest are subject to plant diseases and insect pests and human disturbance serious in grade 3 status, description of plant diseases and insect pests prevention and human disturbance degree has a more obvious effect to reduce the improvement of the whole stand.(3) Low-quality forest evaluation index weight determination and low quality forest with low efficiency evaluation results. By using hierarchical analysis method, so as to obtain the low-quality forest evaluation model for:RI (low quality forest with low efficiency evaluation index)=0.5423* B1 (stand quality) +0.2333* B2 (forest division quality +0.1397* B3 (forest ecological function) +0.0847* B4 (forest community resistance). Plots in forest ecological function evaluation score lowest forest community resistance force evaluation score was the highest, and stand quality scores were between 2 to 4 points. According to the low quality and low benefit forest model calculation of low quality Inefficient forest evaluation results, all the known sample of low-quality inefficient forest evaluation score is generally in the 4～5, low-quality forest low-quality low level is low. Results show that, Chinese fir low quality inefficient pure forest and Pinus massoniana low-quality inefficient pure forest in medium low quality and low grade, defective forest of Chinese fir in severe low quality and low benefit level.(4) Study on the low quality and low benefit forest improvement model. Summarized existing transformation models and evaluation of low-quality and low-benefit forest level, determining low-quality and low-benefit forest improvement model, based on the low indicator to identify causes of low quality and low-benefit forest, concrete reform measures, and the longevity and low-quality and low-benefit forest replanting trees in State-owned forest farm to determine. Which, fir low quality low effect pure forest and Masson low quality low effect pure forest in in the degrees low quality low effect grade, main low score index concentrated in strains number density and forest Division to conditions index Shang, also, trees layer species too single, according to research district live, on two species forest points take local transformation mode and tending transformation mode phase combined of way for transformation, local species select longevity State-owned forest around selected growth State good of goose Catalpa, and sightseeing wood, and Koelreuteria Paniculata, and mountains smiling and South red beans Cedar as fill plant species; In severe errors of levels of low-quality and low-benefit Chinese fir forest in addition to biodiversity indicators, other indicators are at a low level, select full rebuilding mode, after top dressing for the woodlands, select Maple flavor, rhododendron as replanting trees, ultimately to improve the low-quality and low-benefit forest stands quality forest ecological function and purpose.