| 摘要: |
| 为探究新疆石河子垦区滴灌棉田粉壤土不同容重地块对土壤水分特征曲线的影响，采用了张力计法来测定3种容重土壤的土壤水分特征曲线，并用vanGenuchten模型进行拟合及分析。结果表明：各容重土壤吸湿与脱湿过程土壤水分特征曲线均符合vanGenuchten模型。随着容重的增加，粉壤土脱湿与吸湿过程曲线表现出渐渐上移的状态。不同容重土壤脱湿与吸湿过程中相同含水率情况下，容重为1.741g/cm3的土壤水吸力在吸湿与脱湿过程滞后值最高，滞后存在性最大，保水性最好，容重1.631g/cm3为次之，而容重1.489g/cm3为最小。表明容重的增大，土壤剖面易吸水，难失水，土壤保水性能越好； |
| 关键词: 土壤水分特征曲线;土壤含水率;土壤水吸力;比水容重 |
| DOI： |
| 分类号:S275.6 |
| 基金项目:南京水利科学研究院水文水资源与水利工程科学国家重点实验室(2018nkms02) |
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| Determination of soil water characteristic curve under different bulk density conditions of drip irrigation cotton field loam |
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mahemujiang·aihemaiti, hudan·tumaerbai
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College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University
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| Abstract: |
| In order to explore the influence of different weight-bearing plots on the soil water characteristic curve of the drip-irrigated cotton field in Shihezi Reclamation Area, Xinjiang, the soil moisture characteristic curves of three bulk-density soils were determined by the tensiometer method, and the vanGenuchten model was used for fitting and analysis. The results showed that the soil moisture characteristic curves of the soil moisture absorption and desorption processes of the bulk density soils were consistent with the vanGenuchten model. With the increase of bulk density, the dehumidification and moisture absorption process curves of silt loam showed a state of gradually moving upward. Under the same water content during dehumidification and moisture absorption in different bulk density soils, the soil water suction with a bulk density of 1.741g/cm3 has the highest hysteresis value in the moisture absorption and desorption process, the maximum hysteresis is present, and the water retention is the best. The bulk density is 1.631g/cm3. Secondly, the bulk density of 1.489g/cm3 is the smallest. It indicates that the bulk density is increased, the soil profile is easy to absorb water, water is difficult to lose, and the soil water retention performance is better; |
| Key words: Soil water characteristic curve; soil water content; soil water suction; specific water weight |
