摘要
为了探明保水剂对土壤水分入渗性能及变化过程的影响,该文通过室内积水入渗试验,比较分析了保水剂作用下土壤水分的入渗率、累积入渗量及湿润锋等的动态变化。结果表明:保水剂对入渗率的影响具有稳定性和一致性。上层混施(0～10 cm)和层施(5 cm)保水剂会限制土壤水分向下运移,30 min后累积入渗量分别比对照显著减少了17.3%～ 36.6%和5.5%～46.6%;而且随着保水剂用量增加,抑制效应增大。相比较而言,这种减缓入渗的程度在保水剂层施,且用量为0.1%时更为明显。下层(10～20 cm)混施和层施(10 cm和15 cm)保水剂对土壤水分入渗的抑制是有限的,约比对照降低了4.9%～11.9%;但当保水剂层施量为0.1%时,土壤水分入渗反而会随着入渗进程而增加,累积入渗量可达到对照的1.1倍。层施保水剂后,保水剂层及保水剂下层土壤含水率会普遍增加1.1～1.9倍。
In order to determine the effects of super absorbent polymer on characteristics and dynamic changes of soil water infiltration,the dynamic changes of infiltration rates,cumulative infiltration,and wetting front of soil water under super absorbent polymer were analyzed through the lab experiments.The results showed that the influences of super absorbent polymer on infiltration rate were stable and consistent.Mixed(0-10 cm)and layered(5 cm)application of super absorbent polymer in upper soil layer would restr...
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第2期18-23,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家“十一五”863计划项目(2006AA100215)
国家科技支撑计划项目(2006BAD04B07)
关键词
积水入渗
入渗率
土壤含水率
保水剂
湿润锋
ponding infiltration
infiltration rate
soil water content
super absorbent polymer
wetting front
