羟丙基甲基纤维素作土壤改良剂对土壤溶质运移的影响
S153.5; 羟丙基甲基纤维素(hydroxypropyl methyl cellulose,HPMC)是一种潜在的土壤改良剂,加入土壤中后具有明显的减渗效果,对缓解黄土高原水土养分的流失具有重要意义.该文通过在土壤中施加不同含量的HPMC,研究HPMC对土壤溶质迁移特性的影响.结果表明:1)HPMC质量分数在0～0.5 g/kg范围内,饱和导水率随HPMC添加量增大而逐渐减小,0.5 g/kg组相比未添加HPMC的空白组降低37.3％;土壤中保守性溶质的运移速度显著降低;随HPMC添加量增加,溶质的初始和完全穿透时间明显推迟,穿透总历时延长;2)CDE方程和两区模型均能较好地模拟在土壤中添...
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| Published in | 农业工程学报 Vol. 35; no. 5; pp. 141 - 147 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Chinese |
| Published |
西安理工大学西北旱区生态水利国家重点实验室,西安,710048
01.03.2019
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2019.05.017 |
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| Abstract | S153.5; 羟丙基甲基纤维素(hydroxypropyl methyl cellulose,HPMC)是一种潜在的土壤改良剂,加入土壤中后具有明显的减渗效果,对缓解黄土高原水土养分的流失具有重要意义.该文通过在土壤中施加不同含量的HPMC,研究HPMC对土壤溶质迁移特性的影响.结果表明:1)HPMC质量分数在0～0.5 g/kg范围内,饱和导水率随HPMC添加量增大而逐渐减小,0.5 g/kg组相比未添加HPMC的空白组降低37.3％;土壤中保守性溶质的运移速度显著降低;随HPMC添加量增加,溶质的初始和完全穿透时间明显推迟,穿透总历时延长;2)CDE方程和两区模型均能较好地模拟在土壤中添加不同含量HPMC时溶质的运移状况,2种模型的拟合曲线也均能与实测曲线较好吻合,但两区模型的模拟精度更高.3)基于两区模型的参数拟合结果,随HPMC添加量的增加,平均孔隙水流速越小,水动力弥散系数、弥散度和质量交换系数均增加,而土壤可动水体的含水量比率逐渐减少. |
|---|---|
| AbstractList | S153.5; 羟丙基甲基纤维素(hydroxypropyl methyl cellulose,HPMC)是一种潜在的土壤改良剂,加入土壤中后具有明显的减渗效果,对缓解黄土高原水土养分的流失具有重要意义.该文通过在土壤中施加不同含量的HPMC,研究HPMC对土壤溶质迁移特性的影响.结果表明:1)HPMC质量分数在0～0.5 g/kg范围内,饱和导水率随HPMC添加量增大而逐渐减小,0.5 g/kg组相比未添加HPMC的空白组降低37.3％;土壤中保守性溶质的运移速度显著降低;随HPMC添加量增加,溶质的初始和完全穿透时间明显推迟,穿透总历时延长;2)CDE方程和两区模型均能较好地模拟在土壤中添加不同含量HPMC时溶质的运移状况,2种模型的拟合曲线也均能与实测曲线较好吻合,但两区模型的模拟精度更高.3)基于两区模型的参数拟合结果,随HPMC添加量的增加,平均孔隙水流速越小,水动力弥散系数、弥散度和质量交换系数均增加,而土壤可动水体的含水量比率逐渐减少. |
| Author | 吴军虎 任敏 |
| AuthorAffiliation | 西安理工大学西北旱区生态水利国家重点实验室,西安,710048 |
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| Author_FL | Wu Junhu Ren Min |
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| DocumentTitle_FL | Effect of hydroxypropyl methyl cellulose as soil modifier on solute migration in soil |
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| Keywords | 羟丙基甲基纤维素 穿透曲线 模型 饱和导水率 对流弥散方程 溶质 土壤 |
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| Title | 羟丙基甲基纤维素作土壤改良剂对土壤溶质运移的影响 |
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