【作者】 王辉； 王全九； 姚帮忪；

【Author】 WANG Hui1, 2, WANG Quanjiu2, 3 ,YAO Bangsong1 (1. College of Engineering, Hunan Agricultural University, Changsha 410128,China;2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China;3. Institute of Water Resource, Xi’an University of Technology, Xi’an 710048,China)

【机构】 湖南农业大学工学院； 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室； 西安理工大学水资源研究所；

【摘要】 聚丙烯酰胺(PAM)是土壤物理性质改良剂重要材料。采用室内一维垂直积水入渗试验,分析了PAM施加用量和施加方式对入渗率、入渗量以及湿润锋的影响。试验结果表明,地表施加PAM是增渗还是减渗与其施加用量有关;与对照处理(PAM用量为0)相比较,表施5种PAM用量水平,其入渗量分别减少为-16.5%、2.21%、38.47%、29.57%和49.12%,湿润锋位移相应减少-3%、0%、30%、43%和60%;在相同历时下,混施5种PAM用量水平,其入渗量相应减少为-11.5%、1.2%、0.88%、12.99%和25.90%,湿润锋位移相应减少10%、10%、12.7%、30%和39.3%;入渗量和湿润锋位移与时间关系均符合幂函数,而且幂函数参数值与施加PAM用量均呈负线性关系,也表明表施PAM对改变土壤入渗特征量比混施更显著。更多还原

【Abstract】 Polyacrylamide (PAM) is one of the important materials for modifying soil physical properties. The influence of PAM dosage and application methods on the vertical infiltration characteristics, such as infiltration rate, cumulative infiltration and wetting front distance, was investigated by some vertical infiltration experiments. The results showed that the effect of increasing infiltration or decrease it was depend on the PAM dosage. Compared with control treatment (PAM dosage is zero), with five different PAM dosage and application on soil surface, their cumulative infiltrations decreased by -16.5%、2.21%、38.47%、29.57% and 49.12%, and their wetting front distances reduced by -3%、 0%、30%、43% and 60%, respectively. When PAM was applied by mixing soil, cumulative infiltrations decreased by -11.5%、1.2%、0.88%、 12.99% and 25.90%, and their wetting front distances reduced by 10%、10%、12.7%、30% and 39.3%, respectively. The variations of cumulative infiltration and wetting front distance with time were best described by a power increasing model with the increasing coefficient negatively linear related to PAM dosage. So PAM application on soil surface was more effect on infiltration than in soil.更多还原