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地下滴灌条件下土壤水分运动研究
引用本文:张和喜,袁友波,舒贤坤,方小宇,房军.地下滴灌条件下土壤水分运动研究[J].安徽农业科学,2008,36(8):3277-3279.
作者姓名:张和喜  袁友波  舒贤坤  方小宇  房军
作者单位:1. 贵州省水利科学研究院,贵州,贵阳,550002
2. 贵州省烟草科学研究所,贵州,贵阳,550003
摘    要:目的]研究地下滴灌条件下土壤水分的运动规律。方法]利用TDR测定土壤含水率,连续观测得到地下滴灌灌水过程中湿润锋的运移动态、灌水完毕时及24h后的土壤含水率分布情况。结果]随着时间的延长,湿润锋的进展速度逐渐减小。灌水完毕时含水率等值线的整体分布近似为椭圆形,与壤土水分分布的一般特征相吻合。由于蒸发因素的存在,接近地表部分的土壤含水率为9.2%,小于土壤初始含水率,停止灌溉24h后,除土壤内部的含水率重新分布之外,土壤湿润体的形状和范围也有了较大的改变,水分达到了地表下70cm处,但湿润体在水平方向的运移却不很明显。结论]该研究初步了解了地下滴灌条件下土壤水分入渗的特征。

关 键 词:地下滴灌  土壤水分运动  湿润锋
文章编号:0517-6611(2008)08-03277-03
修稿时间:2007年12月1日

Experimental Study on Soil-water Movement under Subsurface Drip Irrigation
ZHANG He-xi.Experimental Study on Soil-water Movement under Subsurface Drip Irrigation[J].Journal of Anhui Agricultural Sciences,2008,36(8):3277-3279.
Authors:ZHANG He-xi
Abstract:Objective] The purpose was to study the movement law of soil-water under subsurface drip irrigation. Method] The soil water content was determined by TDR. The movement dynamic of wetting front in the irrigation course of subsurface drip irrigation was observed continuously and the distribution status of soil water content when the irrigation ended and after 24 h were observed. Result] As time extended, the development speed of wetting front reduced gradually. The overall distribution of isolines of water contents was approximate ellipse when the irrigation ended, which accorded with the common character of water distribution in loam soil. Due to evaporation factor, the soil water content was 9.2% in the part close to ground surface, smaller than the initial soil water content. After 24 h since stopping irrigation, besides that the water content in soil interior was distributed newly, the shape and scope of wetted soil body had bigger change and the water reached the underground depth of 70 cm, but the movement of wetted body in horizontal direction was not significant. Conclusion] The infiltration characters of soil water under subsurface drip irrigation were learnt about preliminarily in the research.
Keywords:Subsurface drip irrigation  Soil-water movement  Wetting front
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