| 张国祥,申丽霞,郭云梅.压力水头与土壤容重对微润灌溉水分入渗的影响[J].干旱地区农业研究,2017,35(4):67~73 |
| 压力水头与土壤容重对微润灌溉水分入渗的影响 |
| Effect of pressure heads and soil bulk density on water infiltration under moistube irrigation |
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| DOI：10.7606/j.issn.1000-7601.2017.04.11 |
| 中文关键词: 微润灌溉 压力水头 土壤容重 水分入渗 |
| 英文关键词:moistube irrigation pressure heads soil bulk density water infiltration |
| 基金项目:国家自然科学基金(31271645)；山西省农业科技攻关项目(20140311007-4) |
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| 中文摘要: |
| 为探究微润灌溉条件下水分在不同压力水头、不同容重土壤中的入渗情况，通过室内土箱模拟试验，分别设置h=2.0、1.5、1.0 m的压力水头，土壤容重γ分别为1.20、1.30、1.40 g·cm-3，测定累计入渗量、湿润锋及土壤含水率3个指标。结果发现，水分累计入渗量与压力水头为正相关关系，与土壤容重为负相关关系；微润管在空气和地埋出流情况下的流量与压力水头均为线性增函数关系，相同压力下，微润管的空气出流量明显大于地埋流量,微润灌溉系统更适宜采用地下埋管方式；湿润锋是以微润管为中心的近似圆形，水平运移距离与垂直向下运移距离均大于垂直向上运移距离，重力对微润灌条件下水分运移有一定的作用，但该作用随着土壤容重的增加逐渐减小；湿润锋运移距离与时间的关系近似为幂函数关系,入渗指数约为0.5；土壤容重越大，水分在土壤中的入渗速率越小，土壤对水分的蓄持能力越弱；经计算，微润灌溉的灌水均匀性符合要求。 |
| 英文摘要: |
| In order to investigate the relationship between water's infiltration and different pressure heads and bulk density under moistube irrigation, treatmenst of three pressure heads (2.0、1.5、1.0 m) and three bulk density (1.20, 1.30,1.40 g·cm-3) were conducted by soil culture experiments. Three indicators, accumulative infiltration, wetting front and soil water content were measured. The result revealed that the accumulative infiltration of water was positively related with pressure heads, but negatively with soil bulk density. The discharge of moistube was linearly related with pressure heads under air and burying. The wetting front was an approximate circle with a moistube centre. The horizontal movement distance and the vertical upward movement distance were larger than the vertical downward movement, and gravity had certain effect on water movement under moistube irrigation. However, the effect was weaker and weaker with the increasing soil bulk density. |
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