| 引用本文: | 马己安,冯克鹏,李王成,等.基于水面蒸发量的宁夏中部干旱带土壤蒸发量估算研究[J].灌溉排水学报,0,():-. |
| majian,fengkepeng,liwangcheng,et al.基于水面蒸发量的宁夏中部干旱带土壤蒸发量估算研究[J].灌溉排水学报,0,():-. |
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| 基于水面蒸发量的宁夏中部干旱带土壤蒸发量估算研究 |
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马己安1,2,3,3, 冯克鹏1, 李王成1, 郝璐1, 李于坤1, 高海燕1
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1.宁夏大学土木与水利工程学院;2.西北退化生态系统恢复与重建教育部重点实验室;3.旱区现代农业水资源高效利用教育部工程研究中心
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| 摘要: |
| 【目的】为探究宁夏中部干旱地区土壤蒸发与水面蒸发及含水率的关系，并以此划分宁夏中部干旱地区土壤蒸发过程各个阶段，分段拟合该地区基于水面蒸发量和含水率的土壤蒸发量计算经验公式。【方法】采用室外土柱试验，通过分析压砂地和裸地土壤蒸发量与水面蒸发量之间的关系，依据土壤蒸发量与水面蒸发量的比值随时间和含水率的变化趋势划分当地土壤蒸发各个阶段。【结果】根据实验数据可将裸地蒸发过程分为3个阶段，将压砂地蒸发过程分为两个阶段。在该试验条件下测得蒸发过程中含水率变化临界值为范围值，其中裸地蒸发过程3个阶段存在两个临界值，分别为0.214 8 g/g＜θb1＜0.209 6 g/g和0.114 0 g/g＜θb2＜0.115 4 g/g，压砂地蒸发过程两个阶段存在1个临界值为0.208 1 g/g＜θg＜0.214 7 g/g。【结论】依据以上含水率临界值将压砂地和裸地土壤蒸发和水面蒸发之间的关系分段建立了经验公式，根据水面蒸发量和土壤含水率推求土壤蒸发量，精度较高，可为当地水资源管理提供参考依据。 |
| 关键词: 压砂地;土壤含水率;土壤蒸发;水面蒸发 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:(51569022,51869023) |
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| Estimation of Soil Evaporation in Arid Zone of Central Ningxia Based on Water Surface Evaporation |
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majian,fengkepeng,liwangcheng,et al
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School of Civil and Hydraulic Engineering, Ningxia University
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| Abstract: |
| [Background] In the arid regions of central Ningxia, there is little annual precipitation and severe evaporation, Water shortage is the main factor restricting the agricultural development in the region. As the main component of field water consumption, to calculate soil evaporation is of great significance for field water management. Planting on gravel-mulched land as the main local planting mode,it is very important to figure out the differences of soil evaporation between bare land and gravel-mulched land. [Objective] In order to investigate the relationship between soil evaporation and water surface evaporation and water content in the arid area of central Ningxia, as well as to find the critical soil water contents that controll soil evaporation process. [Method]Soil evaporations under gravel-mulched and bare soil surface were measured to analyze the relationships between soil evaporation, water surface evaporation and soil water content. [Result] According to the experimental data, the evaporation process of bare land can be divided into three stages, and that in sand mulching is two. The two critical values that discriminate the three stages of the bare land evaporation process were0.214 8 g/g <θb1<0.209 6 g/g and 0.1140 g/g <θb2<0.115 4 g/g. And the critical value that discriminate the two stages of the evaporation process of gravel-mulched land was 0.208 1 g/g<θg<0.214 7 g/g. [Conclusion] Based on the above critical moisture content values, the empirical formula was established for the relationship between soil evaporation and water surface evaporation in the gravel-mulched and bare land. Local water resources management provides a reference. |
| Key words: sand compacted land; soil moisture content; soil evaporation; water surface evaporation |
