不同土地利用方式下土壤粒径分布的分维特征

Fractal Characteristics of Particle Size Distribution in Soils Different in Land Use

西安市临潼区杏园、桑园和农田土壤粒径分布的体积分形维数分析结果表明：（1）杏园和农田土壤颗粒的体积分形维数与〈0．002mm和0．002～0．05mm颗粒含量呈极显著正相关关系，与0．05—0．1mm、0．1～0．25mm颗粒含量呈极显著负相关关系，与0．25—0．5mm颗粒含量不相关。桑园土壤颗粒的体积分形维数与〈0．002mm和0．002～0．05mm颗粒含量呈极显著正相关关系，与0．05～0．1mm、0．1～0．25mm和0．25—0．5mm颗粒含量不相关。（2）桑园和杏园土壤颗粒体积分形维数与土壤有机质含量和pH值复相关达显著水平，而农田土壤颗粒体积分形维数与土壤有机质含量和pH值复相关不显著。

Analysis of the fractal dimensions of soil particle size distribution in soils of an apricot orchard, a mulberry garden, and a crop field in Lintong revealed that in the apricot orchard, and the crop field, the volumetric fractal dimensions of the soils had extremely significant positive correlations with the contents of soil particles, 〈 0. 002 mm and 0. 002 - 0. 05 mm in size, and extremely significant negative correlations with the contents of soil particles, 0.05 -0. 1 mm and 0. 1 -0.25 mm in size, but nothing with the content of soil particles, 0.25 -0.5 mm in size. However, in the soil of the mulberry garden, they had strongly significant positive correlation with the content of soil particles, 〈 0. 002 mm and 0. 002 -0. 05 mm in size and nothing with the contents of soil particles, 0.05 -0.1 mm, 0.1 -0.25 mm and 0.25 -0. 5 mm in size. The soil particle size fractal dimensions of the soils in the mulberry garden and the apricot orchard showed significant multiple correlations with soil pH and content of soil organic matter, but in the crop field they did not show any.