花岗岩崩岗崩积体颗粒组成及分形特征  

Soil Particle Size Distribution and Fractal Dimensions of Colluvial Deposits in Granite Benggang

作　　者：蒋芳市[1] 黄炎和[1] 林金石[1] 赵淦[1] 葛宏力[1] 

机构地区：[1]福建农林大学资源与环境学院,福州350002

出　　处：《水土保持研究》2014年第6期175-180,共6页Research of Soil and Water Conservation

基　　金：国家自然科学基金资助项目(41001169;40671113);国家科技支撑项目(2014BAD15B03)

摘　　要：崩岗崩积体土质疏松，抗侵蚀能力弱，其颗粒组成及分形维数有其自身的特性。采用激光粒度分布仪对花岗岩崩岗崩积体及崩壁土样的颗粒进行测定，对其土壤颗粒组成及分形特征进行比较分析。结果如下：崩积体土壤以砾石、砂粒、粉粒含量为主，黏粒含量极低，土壤质地主要为砾石土；崩积体各层次土壤颗粒分形维数均值为2．61～2．70，分形维数值较低，反映了其细颗粒损失情况；黏粒含量是影响土壤颗粒分形维数的主要因素；崩壁土体的颗粒分形维数大小能够表征土壤的理化特征，而崩积体土壤颗粒分形维数无法真实反映崩积体的理化性质。Colluvial deposit, as a part of hill, has high contents of loose materials and high erodibility, and the particle composition and the fractal dimensions of colluvial soil have its own characteristics. Soil particle size distribution of colluvial deposits and clasping wall in granite hill were analyzed by using the laser article size distribution instrument. The results indicated that colluvial deposits were given priority with gravel, sand and silt contents, clay content was extremely low, the gravel soil was the dominated soil texture; the average fractal dimensions of soil particles of colluvial deposits were less than the range between 2.61 to 2.70, which reflected the characteristic of fine particle loss; clay content was the major factor of the fractal dimension; the fraetal dimension could reflect the soil physical and chemical properties of collapsing wall, but it couldn＇t re- flect the soil properties of colluvial deposits.

关 键 词：崩岗 崩积体 颗粒分布 分形维数 

分 类 号：S152.3[农业科学—土壤学]