Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (3): 507-515 .

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Fractal Features of Rhizosphere Soil Microaggregate and Particle-Size Distribution Under Different Vegetation Types in the Hilly-Gully Region of Loess Plateau

ZHANG Chao, LIU Guo-bin, XUE Sha, SONG Zi-lin, ZHANG Chang-sheng
   

  1. （中国科学院水利部水土保持研究所）
  • Received:2010-06-29 Revised:2010-08-07 Online:2011-02-01 Published:2011-02-01
  • Contact: LIU Guo-bin

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Abstract:

【Objective】The research was made to provide scientific guidance for the sustainable development of ecological restoration and the evaluation of soil quality by studying fractal features of rhizosphere soil microaggregate and particle-size distribution under different vegetation types on abandoned slope cropland in the hilly-gully region of Loess Plateau. 【Method】In this paper, the fractal theory was applied to analyze the fractal features of rhizosphere soil microaggregate and particle-size distribution under natural grassland, artificial grassland and artificial shrubland in Dunshan watershed through experimental analysis. 【Result】The results showed that the effect of different plants on the soil microaggregate and particles was different after slope cropland was abandoned. Whatever in rhizosphere or non-rhizosphere soil, 0.25-0.05 mm, 0.05-0.01 mm class size microaggregate, aggregate state and aggregate degree in natural grassland was higher than that in artificial shrubland and artificial grassland, the content of 0.25-0.05 mm, 0.05-0.01 mm particle, dispersion coefficient and dispersion rate was lower than that in artificial shrubland and artificial grassland. With the exception of Panicum virgatum, a higher aggregate state and aggregate degree was found in rhizosphere compared with non-rhizosphere soil where the dispersion coefficient and dispersion rate was observed. Microaggregate and particle fractal dimension in rhizosphere was lower than that in non-rhizosphere soil. Correlation analysis indicated a more significant correlation between rhizosphere microaggregate, particle fractal dimension and soil physico-chemical properties than non-rhizosphere soil.【Conclusion】In the hilly-gully region of Loess Plateau, the improvement of natural grassland of soil microaggregate is more significant than artificial shrubland and artificial grassland after slope cropland was abandoned. Compared to the non-rhizosphere soil, the aggregate structure in rhizosphere is more favorable and the fractal feature can better reflect the change of soil properties, thus it can be used for evaluating the soil quality during the revegetation in this region.

Key words: hilly-gully region of Loess Plateau, rhizosphere, microaggregate, fractal dimension

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