| Effect of attapulgite to soil aggregate structure and hydraulic parameters |
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| DOI：10.7606/j.issn.1000-7601.2017.06.07 |
| Key Words: attapulgite fractal dimension soil aggregate structure hydraulic parameters water stable aggregates soil moisture characteristi |
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| Abstract: |
| Through adding different amounts (0、10、20、30、40 g·kg-1) of attapulgite (ATP) into the silty loam, carried out the soil moisture characteristic curve test, soil grain size test and soil aggregate structure test, to study the effects of different amounts of ATP to soil aggregate structure and soil hydraulic parameters. The results showed that: The clay particles (<0.002 mm) decreased from 9.28% to 7.06%, silt particle (0.002～0.02 mm) decreased from 50.21% to 26.8%, and the sand particle (0.02～2 mm) increased from 40.52% to 41.49%. With increasing ATP content, the fractal dimension of soil water characteristic curve increased from 2.859 to 2.876, the fractal dimension of soil particle size decreased from 2.645 to 2.628, and when the ATP content was 30 g·kg-1, the two fractal dimensions total appeared the inflection point. When the test over and after the soil natural dry, the big soil particle content was increased. With increasing ATP content, the soil aggregate >0.25 mm was increased from 0 to 2. After using the fractal model of soil moisture characteristic curve to simulate the soil moisture content, the root-mean-square error RMSE between calculated values and measured values was within 10%. Using the unsaturated soil hydraulic conductivity fractal model to predict the unsaturated hydraulic conductivity by different ATP content, its predictive value assumed decrease trend with increasing ATP content. Through comprehensive analysis can be known that: After adding the ATP, the soil water holding capacity was enhanced, has possessed the function to ameliorate the soil, and when the ATP content was 30 g·kg-1, the ameliorated effect will be optimum. |
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