| 韩芳芳,刘秀花,马成玉.不同降雨历时梯田和坡耕地的土壤水分入渗特征[J].干旱地区农业研究,2012,30(4):14~19 |
| 不同降雨历时梯田和坡耕地的土壤水分入渗特征 |
| Characteristics of soil water infiltration in sloping land and level terrace under different rainfall duration |
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| DOI：10.7606/j.issn.1000-7601.2012.04.03 |
| 中文关键词: 不同降雨历时 Hydrus-1D模型 土壤水分入渗 径流 |
| 英文关键词:raining duration Hydrus-1D model water infiltration runoff |
| 基金项目:国家创新引智项目“干旱半干旱地区水文生态及水安全研究”；教育部、国家外专局(111引智项目，B08039) |
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| 中文摘要: |
| 以黄土高原丘陵沟壑第三副区庄浪县为例，研究不同降雨历时条件下坡耕地和水平梯田土壤（黄绵土）水分入渗变化特征，应用Hydrus-1D模型对不同降雨条件下的土壤水分入渗进行
定量模拟研究。结果表明：(1) 与实测数据相比,Hydrus-1D模型模拟降雨后土壤水分的运移较合理。(2) 地表层（0～40 cm）土壤含水量变异系数（CV）呈中等变异，即5 d的时间内梯田和坡耕地地表层的土壤含水量变化大，随着土层深度的增加变异系数减小，呈弱变异性。(3) 在1.45 mm/min降雨强度下，在23 min时拔节期的小麦坡耕地产生径流,水平梯田在整个过程中没有产生径流。(4) 降雨历时为10 min时，在土层深度为0～15 cm，梯田土壤含水量比坡耕地多0.13%～1.65%，在土层深度为30～200 cm，梯田和坡地都没有下渗。降雨历时为20 min、30 min时，在土层深度为0～20 cm，梯田的土壤含水量比坡耕地的分别多0.05%～2.22%、0.01%～2%。 |
| 英文摘要: |
| Hydrus-1D model was applied to simulate soil water infiltration under different raining duration in sloping farmland and level terraces. The results showed that HYDRUS-1D proved to be a powerful and useful tool for simulating the water movement of soil in sloping land and level terrace. In the soil depth, the CV of soil moisture at 0～40 cm was in medium variation, it decreased with the depth, while in other depths the CV was in weak variation. Runoff occurred at 23 min in the 1.45 mm/min rainfall intensity in sloping field, however, there was no runoff in the whole process in level terrace. And in the same condition, the infiltration and soil moisture content in level terrace were higher than these in sloping land. When rainfall duration was 10 min, the water content in soil depth of 0～15 cm in level terrace was 0.13%～1.65% more than that in sloping land, and in the soil depth of 30～200 cm, there was no infiltration in either level terrace or sloping land. In soil depth of 0～20 cm, the moisture content in level terrace were 0.05%～2.22% and 0.01%～2% higher than that in sloping land when rainfall duration was 20 min and 30 min respectively. |
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