Abstract:
By GPS positioning, 341 tobacco planting soil samples were collected from Luliang County in Yunnan Province. The fractal dimensionality,
D value, of soil particle mass in plow layer was calculated with the fractal model of soil particle mass, the general characteristics, distribution, and its relationships with the texture, particle distribution and nutrients of soil were analyzed. The results indicated that
D values ranged from 2.524 to 2.928 with the mean value of 2.823; soil types in the order of
D value were light clay > heavy loam > medium loam > light loam;
D value extremely significantly positively correlated to the mass percentage of clay particle (diameter < 0.002 mm) in soil, while extremely significantly negatively correlated to the percentages of sand particle (diameter > 0.050 mm) and silt particle (diameter from 0.002 to 0.050 mm) in soil, as the percentage of clay particle increased by 10%,
D values increased by 0.05 units; as the percentage of silt or sand particle increased by 10%,
D value decreased by 0.09 or 0.06 units, respectively.
D value of soil particle mass can directly reflect the constitution of soil particles to a certain extent.
D value extremely significantly positively correlated to the contents of organic matter, total N, total K, total P, alkali-hydrolyzable N and available K, while extremely significantly negatively correlated to the content of available P in soil. The fractal dimensionality of soil particle mass can be used to characterize the nutrient status of soil.