Influence of simulated rainfall on physical properties of a conventionally tilled loess soil |
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Authors: | Wouter Schiettecatte Ke Jin Yuqing Yao Wim M. Cornelis Junjie Lu Huijun Wu Koen Verbist Dianxiong Cai Donald Gabriels Roger Hartmann |
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Affiliation: | aDepartment of Soil Management and Soil Care, Ghent University, Coupure links 653, B-9000 Ghent, Belgium;bSoil and Fertiliser Institute, Chinese Academy of Agricultural Sciences, 30 Baishiqiao Road, Beijing 100081, PR China;cLuoyang Institute of Agricultural Sciences, 5 Jun Min Road, Anle, Luoyang, PR China |
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Abstract: | Rainfall simulations were conducted on a loess derived silt loam soil (Henan province, P.R. China) under conventional tillage. This tillage practice is widespread and involves the turning of the plough layer and the wheat stubble in July (primary tillage), followed by a secondary tillage operation in October. Soil samples were collected and in situ measurements were done before each rainfall simulation in order to analyse soil physical properties after successive simulated rainfall events. The purpose of this study was to determine rainfall induced changes in saturated hydraulic conductivity, bulk density, penetration resistance, water retention and soil erodibility. The results only showed significant differences in soil bulk density and erodibility when applying successive rainfall events. Penetration resistance and water retention (at matric potentials ≤ − 3 kPa) were not significantly affected and soil surface sealing was not observed. This was also confirmed by the infiltration measurements, where no significant differences in saturated hydraulic conductivity were found. From a soil conservation point of view, this study indicated that the primary tillage operation (i.e. ploughing at the beginning of July) is rather disadvantageous: the saturated hydraulic conductivity is not significantly affected, but the soil erodibility is considerably higher in comparison to a consolidated soil. Furthermore, the beneficial effects of the wheat stubble on soil and water conservation are lost by the tillage operation. |
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Keywords: | Field rainfall simulation Loess soil Conventional tillage Soil properties Consolidation |
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