| Spatial variability of soil saturated hydraulic conductivity and its influencing factors in the gravel mulched field of Ningxia |
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| DOI：10.7606/j.issn.1000-7601.2016.04.09 |
| Key Words: gravel mulched field soil saturated hydraulic conductivity geostatistical statistics kriging interpolation |
| Author Name | Affiliation | | BAI Yi-ru | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG You-qi | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Fei | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | WANG Jian-yu | College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Spatial variability of soil saturated hydraulic conductivity and its influencing factors could lay the scientific basis for soil water and soil desiccation management in mulched field. The classical and geological statistics were combined to identify the spatial variability of soil saturated hydraulic conductivity and its influencing factors at 0～10 cm and 10～20 cm depths with 10 m×10 m grids. The classical statistics indicated that at the 0～10 cm and 10～20 cm depths the soil bulk density, total porosity and capillary porosity showed light variation, saturation moisture content, soil organic matter showed moderate variation, while soil saturated hydraulic conductivity had moderate and wide variation at the 0～10 cm and 10～20 cm depths, respectively. The capillary porosity was the key factors influencing saturated hydraulic conductivity by Pearson correlation analysis, followed by bulk density, total porosity, saturation moisture content and soil organic matter content. The geological statistics indicated that saturated hydraulic conductivity at the 0～10 cm depths was basically affected by random factors with pure nugget variograms, while at the 10～20 cm depths primarily affected by structural factors. At the 0～10 cm and 10～20 cm depths, the spatial variability of soil bulk density was mainly affected by random factors. According to the spatial distribution patterns, saturated hydraulic conductivity was highly negative correlated with bulk density, while was high positively related to saturation moisture content, total porosity and capillary porosity. |
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