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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。
Taking Tongyutang in the lower reaches of Nandu River of Hainan Province as the research object, 52 sediments of river and ponds and 6 samples of coastal farmland were collected. Based on the classification criteria of soil grading and soil classification in the United States, the fractal theory was used to calculate the quality of 58 samples The fractal dimension was used to investigate the differences in grain-size composition of the sediments between the ponds and the adjacent farmland. The correlation between fractal dimension of sediment and grain-size composition and organic matter content was revealed. The results showed that: (1) The sediments of the river ponds and the farmland soil in the coastal area are very similar in grain-size composition, with very fine sand and silt mainly, and the soil texture types are mostly loam. The fractal dimension of the sediment diameter is slightly higher than that along the coast The fractal dimension of farmland, the former averaged 2.662 and the latter 2.591. (2) There is a significant positive correlation between the fractal dimension of sediment and its clay and silt content, but negatively correlated with the sand content. The fractal dimension of sediment has a significant positive correlation with the organic matter content. (3) The physical and chemical properties of Tangliu pond sediments indicate that the sediments of the river banks in the lower reaches of Nandu River can be used for soil improvement.