河塘底泥与岸边土壤粒径分形维数及与其性状关系——以海南岛南渡江下游塘柳塘为例

Fractal Dimension and Characteristics of Soil Particle Size in Pond Sediment and Farmland Soil—An example of Tangliu pond at the lower reach of Nandu River, Hainan Island

以海南省南渡江下游塘柳塘为研究对象,采集52个河塘底泥和6个沿岸农田土壤样品,依据美国制土壤粒级分组与土壤质地分类标准,应用分形理论计算了58个样品的质量分形维数,探讨河塘底泥与邻近农田土壤在粒级组成上的差异,并揭示底泥粒径分形维数与粒级组成及有机质含量之间的相互关系。结果表明:(1)河塘底泥与沿岸农田土壤各粒级组成非常相似,均以极细砂、粉砂为主,土壤质地类型多为壤土;底泥粒径分形维数略高于沿岸农田分形维数,前者均值为2.662,后者为2.591。(2)底泥粒径分形维数与其黏粒和粉粒含量呈显著正相关关系,而与其砂粒含量呈显著负相关关系;底泥粒径分形维数与其有机质含量呈显著正相关关系。(3)塘柳塘底泥理化性状表明,南渡江下游河塘清淤底泥可用于周边土壤改良。

Tangliu pond at the lower reach of Nandu River was taken as the research object, and 52 pond sediment samples and 6 farmland soil samples along the pond were collected. According to the United States Department of Agriculture(USDA) textural soil classification, the mass fractal dimensions of 58 samples were calculated using the fractal theory. This research discussed the differences between the particle structures of pond sediments and farmland soil along the pond, and explored the relationships between sediment particle structure, organic matter content and fractal dimension. The results showed that:(1) The particles were mainly composed of very fine sand and silt and soil texture was loam in the pond sediments and farmland soil. The fractal dimension of pond sediments was slightly higher than that of the farmland soil(2.662 and 2.591).(2)There was a significantly positive correlation between fractal dimension and clay content, silt content and organic matter content, and a significantly negative correlation between the fractal dimension and sand.(3)The physicochemical properties of Tangliu pond sediments implyed the application of dredge sediments would improve soil quality in the downstream of Nandu River.