兴国县红壤颗粒分形及其与环境因子的关系

以土壤颗粒组成数据为基础，运用分形模型，分析了红壤丘陵山区林地土壤颗粒的分形维数。结果表明：84个耕层土壤颗粒的分形维数D为2．568～2．828，其中紫色土2．722，红壤2．700，棕红壤2．693，黄红壤2．670，黄壤2．713。D随土壤质地的变细而增大。从空间分布上看，研究区域的西部和东南部D值较大，而西南部和北部D值较小，D在2．7～2．8的面积最大，为1171km^2，占总面积的47．0％，D在2．8以上的面积最小，为48km。，占总面积的1．9％。土壤分维数和坡向、海拔之间呈显著正相关关系，而与坡度、平面曲率、剖面曲率之间无明显的相关关系。

Fractal dimension of red soil particle and relationship with environmental factors in Xingguo County, China

Base on the data of soil particle composition and fractal model, soil particle fractal dimension(D) had been analyzed in forestland of hilly region. Results show that 84 topsoil particle dimensions are between 2.568 and 2.828, fractal dimension of purple soil is 2.772, red soil 2.700, brown red soil 2.693, yellow red soil 2.670, yellow soil 2.713. Fractal dimension increases along with the soil texture fine. From the spatial distribution, fractal dimension is bigger in the west and southeast of study area, but smaller in the northwest and north; D between 2.7 and 2.8 is predominant, accounting for 1171 km² or 47.0% of total area of study region, while D above 2.8 is the least represented, covering 48 km² or 1.9%. The fractal dimension are in highly significant positive correlation with aspect and elevation, while no significant correlation with slope, profile curvature, plane curvature.