| Forest as the most important natural resources, is one of nature has a tremendous and valuable "green wealth", affectionately known as the "lungs of the earth." Forests play a variety of functions, including the provision of forest and forest products, fixing carbon and releasing oxygen, soil conservation, forest recreation, maintenance of biodiversity, water conservation, clean environment eight categories. Daxing’an Mountains forest area as an important barrier to the northeast, it is the state-owned forest resources, natural forest protection project, research area forest multifunction evaluation system, to achieve maximum benefit multifunctional forest has important practical significance. Geographic Information System (GIS) with a powerful spatial analysis and processing functions, Based on GIS platform to 2008 Pangu forest farm II survey database and graph data base, the 6059 study area into four small class forest species, respectively, for general timber, water and soil conservation forests, road protective forests and environmental protection forests. Based on scientific and operability, for different kinds of forest tree species affected by the filter multifunction evaluation factors, determines the weight factor calculated evaluation value with improved radar, the establishment of forest in sub-compartment evaluation system level by Analytic Hierarchy Process. The main conclusions are as follows:1) In this paper, multifunction evaluation value calculation improved radar chart, unique, namely the use of improved radar chart area and perimeter established evaluation function, obtained function value does not vary with change in the order of factors, making the evaluation results more versatile scientific, better than ordinary radar map.2) Timber study area generally have sub-compartment 1612, screening the main evaluation factors have accumulated sub-compartment’s stock volume C1, skidding distance C2, an area of sub-compartment C3, gradient C4, status level C5, diversity C6, naturalness C7. 1612 sub-compartment evaluation value calculated by the improved radar and the value of the statistical analysis, the mean of 0.5279, indicating that at the middle level of the tree species in small classes on the average development factor.3) Study on Water Conservation Forest has sub-compartment 4279, mainly screening evaluation factors are species composition C1, gradient C2, soil thickness C3, undergrowth vegetation coverage C4, diversity C5, naturalness C6, protection level C7, sub-compartment’s stock volume C8, skidding distance C9, small class area C10. Computed using advanced radar chart 4279 in small evaluation value, and the value of the statistical analysis, the mean of 0.5051, indicating that at the middle level of the tree species in small classes on the average development factor, which is consistent with the general evaluation of the results of timber.4) Road protective forests in small study area 118, the main road from the screening evaluation factors as distance C1, species composition C2, dominant tree species C3, undergrowth vegetation coverage C4, diversity C5, naturalness C6, protection level C7. Evaluation value calculation 118 small classes with improved radar, and the value of statistical analysis, frequency distribution chart shows three peaks, concentrated in the 0.3-0.6, on the whole is not very normal distribution, mean of 0.4664, indicating that the forest species in small classes factor in the development of middle level slightly below the average. Environmental protection forest tree species in small classes, a total of 50, located in the surrounding towns and villages, the kind of multi-purpose forest research only forest types, a simple analysis of dominant tree species, canopy density, age group and past measures.GIS technology and improve radar map references to forest evaluation, to provide a new platform and calculation methods for the evaluation of multifunctional forest, make the image clearer expression of the results, more scientific. |
PDF Full Text Request