Role of water repellency in aggregate stability of cultivated soils under simulated raindrop impact

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• 作者：Lucia Ko?enková ; Peter Matú?
• 关键词：aggregate stability ; agricultural soils ; soil aggregates ; water repellency
• 刊名：Eurasian Soil Science
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：48
• 期：7
• 页码：754-758
• 全文大小：141 KB
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• 作者单位：Lucia Ko?enková (1)
  Peter Matú? (1)
  
  1. Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University, Mlynská dolina G, 84215, Bratislava, Slovak Republic
  
• 刊物主题：Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Springer US
• ISSN：1556-195X

文摘

Soil aggregate stability (AS) is an important indicator of soil physical quality. For the purpose of this research it was hypothesized that particular properties such as water repellency (WR) influence soil aggregation and AS. Directly after sampling, WR was detected for three soils, after a week of air-drying two of these soils still showed some resistance to penetration by a water drop placed on the surface (WDPT test). The study examines AS of air-dried texturally different aggregates of size 0.25-.5 mm taken from surface layers (5-5 cm depth) of six agriculturally used soils. The procedure involves exposure of soil aggregates to direct impact of water drops. Results showed that soil AS increases in order: cutanic Luvisol (siltic) < haplic Chernozem < calcic mollic Fluvisol < mollic grumic Vertisol (pellic) < mollic Fluvisol (calcaric) < gleyic Fluvisol (eutric). Gradual increase in AS can be explained by the increase in soil organic matter content and its hydrophobic properties. Although WR has been most commonly observed in soils under forests and grass cover, the results confirmed that cultivated soils may also create water-stable aggregates, especially in the case when their organic matter induces WR under particular moisture conditions.