| Study on farmland soil physical status in Guanzhong area of Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2011.01.14 |
| Key Words: Guanzhong farmland soil bulk density soil compactness soil physical status |
| Author Name | Affiliation | | ZHANG Yulin | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | WANG Yiquan | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | HU Haiyan | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | SUN Lei | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | XU Hai | College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to reveal the variation tendency of farmland soil quality under the influence of human activity, we investigated the soil bulk density and soil compactness in different districts in Guanzhong area. The results showed that the soil bulk density in deep layers was significantly higher than that in top soils, with an average of 1.00 g/cm3. However, in the 10～20 cm layer the samples exceeding 1.30 g/cm3 accounted for 88% of the overall, with an average of 1.40 g/cm3. In the 20～30 cm layer the values averaged 1.61 g/cm3, and the samples exceeding 1.40 g/cm3 accounted for 96% of the overall. So, this layer was defined to confine plant roots in a large extent. Similarly, the average value of soil bulk density was 1.60 g/cm3, and 44% of the samples were higher than the standard(1.60 g/cm3). In the 0～25 cm layer the soil compactness increased sharply, however it kept at 1 600 kPa under 25cm in the soil, probably having restricted the growth of plants. Through partial correlation analysis, it was clear that soil compactness, significantly, was positively related to soil bulk density, negatively related to soil water content. It indicated the reason why soil compactness increased was due to soil bulk density. In this experiment only the top 10cm-layer soil was fit for planting, and deep layers were universally compacted, which posted a severe problem in root extending. What’s more, the problem under deep soil layers was invisible, thus we must pay great attention to it. It seemed that deep plough and scarification were useful methods for improving farmland soil physical status in Guanzhong. |
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