| Physical properties in soil profile of farmlands in Central Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2014.04.026 |
| Key Words: bulk density compactness saturated hydraulic conductivity Central Shaanxi farmland soil |
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| Abstract: |
| In order to reveal the effects of intensive production and cultivation model on the variation of soil quality, the physical properties were determined in 0～60 cm soil profile of farmlands in Central Shaanxi. The results showed: (1) The bulk density in 0～60 cm soil profile showed an initial increase followed by a steady decrease with the increase of depth. The bulk density was lowest in 0～10 cm layer (a mean of 1.34 g·cm-3) and highest in 20～40 cm layer (1.67 g·cm-3). (2) The compactness in 0～60 cm soil profile increased with the increase of depth, and the average compactness in 0～15 cm, 15～25 cm and 25～45 cm layers was 482 kPa, 1 647 kPa and 2 268 kPa, respect
ively. (3) The saturated hydraulic conductivity (Ksat) showed a sharp decrease with the increase of soil depth, and the highest Ksat was 0.968 mm·min-1 in 0～10 cm layer. There was a statistically significant difference in Ksat among soil layers. In conclusion, the soil structure was relatively ideal only in 0～10 cm layer, and the subsurface layers were universally degenerated, which limited severely root extension, gas exchange and water infiltration. Therefore, great attentions should be paid to the improvement of soil physical properties. |
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