摘要
针对沙土地地区降雨少、蒸发大、田间持水量小的特点,在王杨兴沙土地进行了地埋滴灌试验,在测坑剖面测量了湿润峰在横向和纵向上的变化幅度,利用TDR测量了含水率随时间的变化,分析了不同灌水量、不同埋管间距对水分在沙土地中运移的影响。结果表明:湿润峰在相同灌水量下,埋管间距越小、湿润峰越大、交汇面积越大,形成的湿润层越厚;在相同间距下,灌溉水量越大、湿润峰纵面上扩散面积越大、湿润层越厚。土壤水分的变化在垂向上呈近似二次曲线分布,且随时间的推移水分的变化逐渐趋于水平。本研究初步了解了沙土地地埋滴灌条件下水分的运移规律,为在沙土地区推广节水灌溉提供依据。
Aiming at the characteristics of less precipitation, large evaporation and few amount of keeping water in sand soil areas, subsurface drip irrigation experiment was carried out in sand soil field of Wang Yangxing village. Water content was measured over time by TDR,and the changes of moist peaks were measured in horizontal and vertical directions by moist box. The impacts of different water quantity and the different pipe pitch on water movement were analyzed the in the same sand field. Results showed that under the same water irrigation amount, moist peaks, the intersection area and the moist layer thickness were inversely related to the laying pipe distance, while under the same distance, the distribution area of vertical section and the moist layer thickness were positively related to the irrigation amount. Soil water content change was distributed normally in the vertical direction, and tended to become level state over time. This study preliminarily analyzed the law of water movement under subsurface drip irrigation and could provide the basis for the promotion of water-saving irrigation in sandy areas.
出处
《南水北调与水利科技》
CAS
CSCD
2011年第4期117-119,共3页
South-to-North Water Transfers and Water Science & Technology
基金
国土资源部公益性行业经费项目"华北平原典型地区水资源约束下的土地合理利用与管制技术研究"(2008334072)
关键词
地埋滴灌
水分运移
湿润峰
含水率变化
沙土地
试验研究
subsurface drip irrigation
water movement
moist peaks
moisture content changes
sandy soil area
experimental study
