针对内陆干旱区滴灌条件下沟垄栽培措施设计不完善等问题,通过研究不同沟垄规格对土壤湿润峰运
移变化规律的影响,旨在为大田沟垄滴灌系统的合理设计提供理论参考价值。采用室内土箱模拟试验,以沟底宽度
和沟底坡度为变量,以计划湿润层为约束条件,分析湿润峰的运移变化规律。在沟底坡度一定的条件下,沟底宽度越
大灌水到达计划湿润层所用时间越长,形成的湿润体体积越大;在沟底宽度一定的条件下,沟底坡度越大灌水到达计
划湿润层所用时间越短,形成的湿润体体积越小;水平、垂直湿润峰运移距离与灌水历时存在幂函数关系。幂函数指
数 b 随沟底宽度及沟底坡度变化差异性较小。水平湿润峰幂函数系数 a 随沟底宽度增加而增加,随沟底坡度增加而
减小。垂直湿润峰幂函数系数 a 随沟底宽度增加而减小,随沟底坡度增加而增加。
其他摘要
In view of the imperfect design of ridge and ditch cultivation measures under drip irrigation in inland arid area,the influence of
different ridge and furrow specifications on the change of soil wetting peak transport is studied,which aims to provide theoretical reference
value for rational design of ridge and ditch drip irrigation system. The indoor soil box simulation test was carried out,and the variation of the
movement of the wetting peak was analyzed by taking the width of the bottom of the ditch and the slope of the ditch as variables and taking the
planned wet layer as the constraint. With a certain slope of the ditch bottom,the greater the width of the ditch bottom,the longer the time it
takes for the irrigation water to reach the planned wetting layer,and the larger the volume of the wetting body. With a certain width of the
ditch bottom,the higher the slope of the ditch bottom,the shorter the time it takes for the irrigation water to reach the planned wetting layer,
and the smaller the volume of the wetting body. The horizontal and vertical wetting peak migration distance has a power function relationship
with the irrigation duration. The power function index b varies little with the width of the ditch bottom and the slope of the ditch bottom. The
horizontal wet power function coefficient a increases with the increase of the width of the bottom of the ditch,and decreases with increase of
the slope of the bottom of the ditch. The vertical wetting peak power function coefficient a decreases with the increase of the width of the
bottom of the ditch,and increases with the increase of the slope of the bottom of the ditch.
修改评论