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Fractal Dimension Features of Soil Aggregates Distribution with the Different Reclamation Years on Loess Plateau

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Fractal dimension of soil aggregates size distributions (ASD) is often used to estimate some soil properties, such as texture and moisture characteristics. Land use patterns largely influence the ASD of soil, but influence on how vegetation destruction for soil properties variation is very limited. Based on the fractal theory, the fractal dimension of ASD under the forest land and farm land with different reclaiming years on Loess Plateau of China was studied in this paper. Various soil samples of forest land and farm land with different reclaimed years (3 years, 6 years, 10 years, 15 years, 20 years, 25 years, and 30 years) were obtained. The results show that the fractal dimension of ASD of forest land and farm land with different reclaiming years is between 2.32∼2.91, and there exists a significantly linear relationship between fractal dimension of ASD and water-stable aggregates content. The less the fractal dimension is, the more the contents of water stable aggregate (>0.25 mm) are, the less the soil bulk density is, and the better the capacity of water-holding and water-supplying for crop growth is, and vice versa. These results indicate that artificial unreasonable land use pattern is the main cause of soil degradation and eco-environmental deterioration. Land use had considerable influences on the fractal dimension of ASD and various other soil properties. Fractal dimensions of ASD can be a useful parameter to monitor soil degradation induced by land use change.
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Keywords: DIFFERENT RECLAMATION YEARS; FRACTAL FEATURES; LOESS PLATEAU; SOIL AGGREGATES SIZE DISTRIBUTION

Document Type: Research Article

Publication date: 2012-01-01

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