摘要
通过对31个土壤样品的测定,研究了不同质地耕层土壤颗粒表面的分形维数(D),结果表明D介于2.7060~2.9968之间,并且同一质地类型的土壤分形维数D差异不大,但有随土壤质地由紧砂土、砂壤土、轻壤土、中壤土、重壤土到轻粘土,分形维数D呈递增趋势。统计分析结果表明:土壤颗粒表面的分形维数D与10个粒级颗粒含量之间存在极显著的线性回归关系;4个粒级对分形维数D的直接贡献由大到小依次为:粘粒〉细粉〉粗粉〉中粉,无论哪一个粒级的颗粒含量增加,通过其它三个粒级的颗粒含量的间接效应都将使分形维数D增大;土壤有机质、土壤阳离子交换量分别与D有极显著正相关,可以用OM=-229.1113+86.5400D和CEC=-84.6456+32.1086D的直线回归方程来描述它们间的数量关系。
The fractal dimensions (D) of soil particle surface were studied by determining 31 soil samples from plowed layers with different texture. The results indicated that the D value was 2. 7060 to 2. 9968 in those soils, and the difference was not significant in the soils with the same soil texture, but the D value increased with the soil particle size from sand to clay. The statistical analysis results showed that: there was a linear regression relationship between the fractal dimensions of particle surface and soil particle contents. The importance of direct contribution of four smallest soil particle size to D value was clay 〉 fine silt 〉 coarse silt 〉 medium silt, and the increase of any kind of soil partial size content would result in the increase of D value by the indirect change of other soil particle contents. The relationship between the soil organic matter, CEC value and D value was positively correlated, and the correlation between soil organic matter content and D value could be described as O. M = -229. 1113 +86.5400D and CEC = -84.6456 + 32. 1086D.
出处
《土壤通报》
CAS
CSCD
北大核心
2007年第3期439-442,共4页
Chinese Journal of Soil Science
关键词
土壤质地
分形维数特征
有机质
Soil texture
Fractal dimensions
Organic matter