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In this study, Japanese larch plantation in the mountains of northern subtropical site type classification and forest land with a unified evaluation Forest site. A variety of benefits to the northern subtropical mountainous Japan the larch plantation scientific silviculture reasonable business and reduce the cost of timber production and forest management investment, improve forest management, and provide theoretical support. The results are as follows: 1, site classification of the use of quantitative theory Ⅰ, partial correlation coefficients, variance ratio and score range three indicators as the main basis for determining the size of the factor contribution rate, to determine the growth of the northern subtropical mountainous Japanese larch in The Main Site Factors elevation, slope and soil thickness, aspect and slope position. Hierarchical combination of integrated multi-factor analysis and the dominant factor, divided northern subtropical mountainous Japanese larch in the 48 site type. 2, the number of site quality score table score sheet prepared using the theory of quantification I established a number of site index equations. The number of site index equations into the quantitative site quality score table, and based on the preparation of a number of site quality ratings table. Both by χ2 test that can be used in practice. The use quantitative site quality ratings table can achieve forest and non-forest land (barren land) for integrated assessment. And 48 site type classification as excellent, good, fair, poor of 4 site level, respectively Ⅰ, Ⅱ, Ⅲ, IV. The northern subtropical mountainous Japanese larch plantation site most of the quality level is above average. , Preparation of site index table using the latest forest managers two types of survey data, the use of 51 fixed standard as the samples tested, stand average tree height and the stand dominant trees average tree height regression equation between. Use of the regression equation, the stand average tree height value is converted to an average height of stand dominant trees, and then use the value of the the stand dominant trees average tree height, fitting oriented site index curve equation; Scaling method, the raw index is incorporated curve cluster and site index table. 4, the application of soil nutrients in the Site Evaluation After correlation analysis, site index, with available N, available P, available K, total N, P, K and organic matter were positively correlated, while the PH negatively correlated with site index. To do with the site index dependent variable, elevation, soil depth, slope, aspect, slope, slope position and other physical environmental factors, as well as the available nitrogen, available phosphorus, available potassium, total nitrogen, total phosphorus, total potassium, organic matter and PH value chemical factor to do independent variable, regression analysis, regression equations derived site index and the Site Factors. The regression equation, site index a site can be easily calculated.
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