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| DOI： |
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| Soil Repellency and the Factors that Affect It in Typical Soils in Central-southern China |
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WANG Jie, YU Bing, WANG Junguang, YANG Wei, LUO Ya, CAI Chongfa
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College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; . Hubei Water Resources Research Institue, Wuhan 430070, China
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| Abstract: |
| This paper measured the repellency (SWR) of typical soils under different weathering conditions in central-south China using the water drop penetration time (WDPT) method. We also examined the spatial variation of SWR and its dependence on soil physicochemical properties. The main results are: ①With the increase in moisture and temperature from the center to the south, soil pH gradually decreased while the free iron (Fed) and aluminum (Ald) oxides increased. The amorphous iron (Feo) and aluminum (Alo) oxides did not show noticeable change over space as the free oxides did. Soil organic matter was higher in top soil than in subsurface soil, and higher in forest soil than in arable soil. ② All soils studied were hydrophilic with the WDPT ranging from 0.47 to 4.00 s; the SWR generally decreased from the center to the south (p<0.05). ③WDPT was positivelyrelated to pH, cation exchange capacity, silt content (r>0.54, p<0.05), but negatively related to sand content, Feo, Fed and Ald (r<-0.56, p<0.05). Stepwise regression showed that Fed and Feo affected soil repellency most (R2=0.71，p<0.01). The results in this paper provide reference for improving soil water management. |
| Key words: mineral soil; soil water repellency; water drop penetration time; Fe and Al oxides |
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