CAJ | 학술논문

在大兴安岭用材林建立20个不同采伐强度的样地，然后采集样地的土壤并对其理化性质进行测定，以土壤pH 、有机质、全氮、全磷、全钾、水解氮、有效磷、速效钾、密度、含水率、最大持水量、毛管持水量、毛管孔隙度、非毛管孔隙度等14个土壤理化因子作为分类指标，采用模糊聚类分析法对20个样地的土壤进行分类，再用F－统计量确定最佳阈值（λ）。结果表明：当阈值λ为0．8483时，20个样地的土壤被分为3类，此种分类较为合理，分类结果与实际情况比较相符。其中：第一类土壤的有机质和全氮质量分数较低，土壤物理性质较差；第二类土壤的全磷和全钾质量分数较低，土壤物理性质较好；第三类土壤的有效磷和速效钾质量分数较低。采用模糊聚类分析法，对大兴安岭不同强度采伐后的样地土壤进行分类行之有效。
재대흥안령용재림건립20개불동채벌강도적양지，연후채집양지적토양병대기이화성질진행측정，이토양pH 、유궤질、전담、전린、전갑、수해담、유효린、속효갑、밀도、함수솔、최대지수량、모관지수량、모관공극도、비모관공극도등14개토양이화인자작위분류지표，채용모호취류분석법대20개양지적토양진행분류，재용F－통계량학정최가역치（λ）。결과표명：당역치λ위0．8483시，20개양지적토양피분위3류，차충분류교위합리，분류결과여실제정황비교상부。기중：제일류토양적유궤질화전담질량분수교저，토양물이성질교차；제이류토양적전린화전갑질량분수교저，토양물이성질교호；제삼류토양적유효린화속효갑질량분수교저。채용모호취류분석법，대대흥안령불동강도채벌후적양지토양진행분류행지유효。
We set up 20 plots in Daxing ’ an Mountains with different cutting intensity , collected the soil of each plot , determined their physical and chemical properties , and took 14 kinds of soil chemical and physical factors including the soil pH , the organic matter, the total N, the total P, the total K, the hydrolysis N, the available P, the available K, the bulk density, the moisture content , the maximum capacity , the capillary capacity , the capillary porosity and the non-capillary porosity . Then, we used the fuzzy clustering analysis method to classify the soil of 20 plots, and the F-statistic to determine the opti-mal threshold value of λ.When λis 0.848 3, 20 plots can be divided into three categories .The classification is the most reasonable , and the classification result is consistent with the actual situation .The organic matter and the total N in the first kind of soil are low , and their soil physical properties are poor , the total N and the total K in the second kind of soil are low, but their soil physical properties are better , and the available P and the available K in the third kind of soil are low.It is an effective approach to use fuzzy clustering analysis method for classifying the soil of the timber forest with differ -ent cutting intensities in Daxing ’ an Mountains .