Study On Aggregate Fractal Characteristics And Fertility Of Purple Soil Under Different Land-Use

Soil is a self-similar structure of the porous medium, has a fractal characteristics, using the weight of soil particles can directly calculate the distribution of soil aggregates fractal dimension. Soil Aggregate structural conditions that affect the nature of the soil one of the important factors. Has a good reunion of the structure of the soil, not only has a high degree of the gap and water holding capacity, but also a good permeability. Soil Aggregate structure of soil nutrients is also the centre of fertility regulation, the size distribution and stability of the porosity of the soil, water holding capacity, permeability and corrosion resistance, especially at home and abroad in recent years on domestic soil clear Aggregates in an important role in soil fertility. How to quantify the aggregate characteristics of its soil fertility and the relationship between the soil must first reunion of quantitative description of the structure, the use of fractal model for the soil aggregates for the fractal dimension for research is one of the ways.In this study, to investigate the home of the purple soil in different land use under the reunion of fractal characteristics and the nature of physical and chemical characteristics of the purple soil in a different rock of the soil for the study, will be selected as a study area Feixianguan group, Shaximiao Formation, Suining group of three purple soil soil rock the region and in each region select a typical representation of five kinds of land use (woodlands, shrubs, natural grassland, agricultural land , Orchards), respectively, a cloth sampling, and through laboratory test analysis of their physical and chemical properties, the use of fractal dimension calculation formula purple soil aggregates distribution and fractal dimension, the composition of its aggregate and fractal characteristics Research, hope to explore different land use patterns on the rock formation of the purple soil and the soil micro-aggregate aggregate impact, and to look for the purple soil soil quality and structure of a quantitative description of the ways to improve the physical and chemical properties of soil, Fertilization provide the basis for guiding grip.The main research results:(1) Of different land use patterns on the purple soil reunion of fractal characteristics of the impact of research in the following conclusions: In the five kinds of land use, forest fractal dimension of the smallest and that its high content of the soil aggregates, and the forest coverage is relatively high, a large number of litters a year of return to the soil; natural grassland, shrubs Fractal dimension is also high, and a natural grass and shrub community structure complex, a multi-layer distribution, a large number of herbal undergrowth and litter, and other factors.Overall, woodland, shrubs and natural grassland soil aggregates 1-0.01 mm-high levels, orchards low, will be integrated with soil profiles from top to bottom to see woodland, the biggest changes in natural grassland, shrub land followed that woodland, shrubs Natural grassland and woodland soil micro-structure for the formation of a catalytic role.Land use different soil micro-aggregates of fractal dimension will have a greater change, which on the surface soil, and its basic trend of a reunion, and the surface soil can be precisely reflect the change in the human nature of the change in soil, Soil micro-aggregates of fractal dimension can also be characterized quality of the soil structure.Micro-reunion of the larger particle can show that the content of the soil micro-structure of the aggregate good or bad, the better the structure of its larger tablets of class-reunion of the higher levels, and the fractal dimension of the lower clay content of soil-the higher the aggregate The poorer the structure, performance for the fractal dimension higher.(2) The purple soil in different soil and rock the reunion of micro-aggregates fractal characteristics of the following conclusions:Soil fractal dimension is reflected soil structure geometry of the parameters in the performance dimension to the higher clay content, the higher the fractal dimension. Soil aggregate size distribution of the fractal dimension reflects the soil micro-aggregates and micro-aggregate content on the soil structure and stability of the trend, that is, aggregate size distribution of the fractal dimension of the smaller, with the soil Good structure and stability.The mother of three from the purple of the purple soil micro-aggregates are fractal dimension, red-brown-purple mud