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| Effect of bulk density on red loam horizontal infiltration and Cl- transport characteristics |
| ZHAO Xinyu, GAO Jinlong, GU Pengfei |
| Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China |
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Abstract In order to study the one-dimensional infiltration and Cl- transport characteristics at different bulk density of red loam, indoor horizontal one-dimensional infiltration experiment was carried out.The infiltration solution was the KCl solution WHOSE concentration was 0.1 mol/L,the experimental soil was red loam and the soil bulk density was set to five different levels of 1.20,1.25,1.30,1.35,1.40 g/cm3.And the theoretical analysis was done after experiment.The results showed that bulk density affects significantly red loam water infiltration and Cl- migration. Furthermore,infiltration rate, cumulative infiltration volume and wetting front decreased with the increase of soil bulk density. After infiltration,the content of Cl- in the soil had a negative correlation with soil bulk density. Philip infiltration model or Kostiakov infiltration model can accurately reflects the relationship between cumulative infiltration and time of different bulk density red soil under one-dimensional infiltration condition(R2>0.98).The coefficient S and K of two models decrease with the increase of soil bulk density,it shows cumulative infiltration and red soil bulk density is negatively correlated.The results can provide theore-tical support for cotton irrigation and fertilization in red loam areas.
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Received: 31 March 2015
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