红壤丘陵区耕层土壤颗粒的分形特征

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区耕层土壤颗粒的分形维数。结果表明,13个耕层土壤颗粒的分形维数D为2.772~2.897,其中紧砂土2.788,砂壤土2.807,中壤土2.814,轻壤土2.817。分形维数随土壤质地的变细而增大;由北向南,逐渐增加;成土母质对土壤颗粒的分形维数影响较大;D与全氮含量达极显著正相关,与有机质含量、全磷含量达显著正相关,D与有机质含量、全氮含量、速效磷含量、速效钾含量的复相关达极显著水平。

Fractal Characteristics of Particle of Arable Layers in Hilly Region of Red Soil

This paper analyzed the fractal dimensions of particle in plow layers of red soil , according to the data of soil particle and fractal model. The results showed that fractal dimensions of particle were 2.772 - 2. 897 in the plowed layers of 13 cropped fields. Among them, tighten sandy soil was 2.788,sandy loam soil was 2.807, medium loam soil was 2. 814 and light loam soil was 2.817. The fractal dimensions of soil particle increased with soil texture fining. From north to south, there was decreasing tendencies. The parental materials had evident influence on the fractal dimensions of particle of soils. The fractal dimensions were in highly significant positive correlation with the contents of total nitrogen, and in very significant positive correlation with the contents of organic matter and the contents of total phosphorus. In addition, in the partial correlation with the contents of organic matter, total nitrogen, total phosphorus, available potassium, available phosphorus was highly significant.