摘要
在新疆林业科学院枣树示范基地进行原状土的滴灌入渗试验,研究砂壤土在不同滴头流量条件下地表滴灌湿润体特征值的变化规律。结果表明:地表滴灌条件下,当滴头流量增加时,湿润体的形状大小会随着滴头流量的增大而增大,水平、垂直方向上湿润锋的运移距离随着滴头流量的增加而不断增大;湿润锋的运移速率、入渗距离比值与水分入渗时间符合幂函数关系;湿润锋水平方向的运移速率比垂直方向上的要大,但是持续的运移时间没有垂直方向上的长;土壤含水率的变化随着滴头流量的增加而增加,距离滴头距离越近含水率变化幅度也越大,当q≥8 L·h-1时,滴头正下方约40 cm左右的土层含水率达到最大值。
This study aimes to investigate the effect of drip discharge on the characteristic value of wetting soil in Jujube demonstration base of Xinjiang Academy of Forestry Sciences,and elucidate the fruit industry in daily management of drip flow. The result shows that the size of wetting soil increased with increasing of drip flow,the wetting front distance in direction of horizontal and vertical increased as well; wetting front migration rate,infiltration distance and water infiltration time followed power function relationship; the wetting front migration rate in horizontal is larger than vertical while migration time is shorter than that in vertical; soil moisture content increased with increasing of drip flow,drip distance influenced moisture content,the moisture content reached maximum below drip 40 cm and q≥8 L·h-1.
出处
《干旱地区农业研究》
CSCD
北大核心
2014年第4期53-58,84,共7页
Agricultural Research in the Arid Areas
基金
国家林业公益性行业重大专项项目"新疆特色林果提质增效关键技术研究与示范"(201304701-2)
关键词
滴灌
湿润体特征值
入渗距离比
土壤含水率
drip irrigation
characteristic value of wetting soil
moist ratio
moisture content of soil
