[1]TONG Haotian,HAN Yanlai,LI Peipei,et al.Effects of Application of Water-Retaining Materials on Water Infiltration and Water Retention Characteristics of Sandy Soil[J].Research of Soil and Water Conservation,2019,26(04):116-122.
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Effects of Application of Water-Retaining Materials on Water Infiltration and Water Retention Characteristics of Sandy Soil
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 04
Page number:
116-122
Column:
Public date:
2019-06-11
- Title:
- Effects of Application of Water-Retaining Materials on Water Infiltration and Water Retention Characteristics of Sandy Soil
- Keywords:
- biochar; wheat straw; water retaining agent; infiltration rate; water content; water holding capacity
- CLC:
- S157.9
- DOI:
- -
- Abstract:
- In order to improve the water parameters of sandy soil with low water capacity, poor water holding capacity and strong permeability, a soil column experiment was used to compare the improvement of sand soil water parameters of application of different water-retaining materials before and after incubation. There are three water-retaining materials: 2% biochar, 2% straw and 0.1% water-retaining agent, and two application methods: mixing with soil and layering at 25 cm of the soil column, six soil column treatments, and a control without water-retaining material (CK); some of the above treatments were selected to incubate at 25℃ for 30 d. The radial motion parameters of water in different treatments were studied, including wetting front infiltration time, infiltration rate, saturated hydraulic conductivity and soil water content in different soil layers. The results showed that the infiltration time of the mixture treatments of 2% biochar and 2% straw were 1.88 times and 1.66 times than the corresponding layering treatments, respectively, and the infiltration rate decreased when the infiltration was completed; in the 0.1% water retention agent columns, on the contrary, the layering treatment was 1.82 times than the mixing treatment; the infiltration durations of different soil columns decreased in the order: layering with 0.1% water retention > mixing with 0.1% water retention agent > mixing with 2% straw > mixing with 2% biochar > CK = layering with 2% straw > layering with 2% biochar; after incubation of the mixing columns at suitable condition, the infiltration time of each material was higher than that before, and the total infiltration time of 2% biochar and 2% straw increased by 2.88 times and 1.50 times, respectively, which showed significant decline of the leakage of sandy soil; compared with CK, the saturated hydraulic conductivity of the treatments of biochar, straw and water retention agent decreased by 6.1%, 22.3% and 82.4%, respectively, before incubation, and decreased by 77.2%, 10.5% and 7.91%, respectively, after column incubation. In conclusion, the effect of layering with water-retaining agent was better than that of mixing treatments, while mixing biochar and straw with soil showed better for improvement of soil water parameters. With the extension of the application time, the improvement of sandy soil parameters affect by biochar and straw greatly increased, especially the biochar application. The results can provide method and data reference for the improvement of sandy soil infiltration and water-retaining.
- References:
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1900-01-01