• 论文 •

### 黄土高原植被破坏前后土壤团粒结构分形特征

1. 南京大学城市与资源学系,南京210093
• 收稿日期:2002-05-10 修回日期:2002-08-21 出版日期:2002-12-15 发布日期:2002-12-15
• 作者简介:丁文锋(1975-),男,河南汝州人,在读博士生。主要从事土地资源与环境方面的研究。
• 基金资助:

国家自然科学基金资助项目(40025102)

### The fractal features of soil granule structure before and after vegetation destruction on Loess Plateau

DING Wen-feng, DING Deng-shan

1. 1Department of Urban and Resources Science, Nanjing University,Nanjing 210093, China
• Received:2002-05-10 Revised:2002-08-21 Online:2002-12-15 Published:2002-12-15

Abstract:

The fractal theory, a new study tool, has been widely applied in soil sciences in recent years. The fractal features of soil granule as well as progress made in soil science research on grain distribution, soil moisture, soil bulk capacity variance and so on are discussed. Based on the fractal theory and relative model, the fractal features of soil granule structure of forest land and different reclaimed farmland were studied in this paper. The results show that the fractal dimension of soil granule structure of forest land and different reclaimed farmland are between 2.32～2.91. The less the contents of the granule >0.25 mm and the water-stable granule, the more the fractal dimension of soil granule and the higher the soil fertility are. There exists close relationship between fractal dimension of soil granule and the contents of soil granule or water-stable granule composition in all kinds of land. The soil physical properties of forest land and different reclaimed farmland vary with the variations of the fractal dimension. The less the fractal dimension, the more the contents of >0.25 mm soil granule and the less the soil bulk density, the better the soil self-restraint capacity. The more the fractal dimension, the less the contents of >0.25 mm soil granule and the greater the soil bulk capacity, the less the soil self-restraint capacity. The results show to certain extent that man-made unreasonable land use is the main cause of soil degradation and eco-environmental deterioration.Vegetation recovery and vehabilitation as well as increase ground coverage are principal countermeasures to reduce the Yellow River sedimentation and accelerate comprehensive control of the Loess Plateau.