|
|
|
| Fractal features of soil aggregate and microaggregate under different land use |
| Liu Mengyun, Chang Qingrui, Qi Yanbing |
| College of Resources and Environment, Northwest Sci-Tech University of Agriculture and Forest, 712100, Yangling, Shanxi, China |
|
|
|
|
Abstract For researching the soil aggregate and microaggregate under different land use modes and studying its quantitative description of soil quality and structure, in Shanghuang experimental station, Guyuan city, Ningxia autonomous region, the soil aggregate structure, microaggregate structure, and their fractal features under five different land use modes (bush forest land, farmland, natural meadow, orchard and artificial meadow) were studied in this paper. The results showed that: the order of the total amount of soil aggregate was natural meadow>bush forest land>orchard>farmland>artificial meadow. The fractal dimension of soil granular structure under these five land use modes ranged from 2.36-2.84. The lower total amount of the granular (>0.25mm) was, the fractal dimension of particle diameter distribution was higher. Natural meadow and bush forest land were beneficial to the formation of soil microaggregates, but the other land use modes were inferior to natural meadow and bush forest land. There was very significantly negative correlation between total amount of the microaggregates (>0.005mm) and the fractal dimension, and very significantly positive correlation between total amount of the microaggregates (<0.005mm) and the fractal dimension. The fractal dimension of soil aggregates and microaggregates may indicate that the soil physical properties are good or not. Man-made unreasonable land use is the main cause of soil degradation and eco-environmental deterioration. Rational utilization of land will be imperative.
|
|
Received: 30 August 2005
|
|
|
|
|
|
|
