膜下滴灌棉田土壤水分空间变异规律研究

2009年,在新疆库尔勒包头湖农场智能化棉花膜下滴灌工程示范区,选择典型的一膜一管4行种植的棉花为试验区(共计20个测点),测定了各个采样点以及3个不同深度的土壤含水率。运用地统计学和经典统计学方法,分析了棉花4个生育期内土壤水分的空间变异特性。结果表明,土壤质地为砂壤土时,土壤含水率的空间变异性属于弱变异;随着棉花的生长,土壤水分的分布越来越趋于均匀化;在棉田主要生育期内,研究土壤含水率空间分布最好的半方差函数模型是球形模型;土壤含水率的大小基本上和该点与滴灌带的垂直间距成反比例关系;棉花行对棉田土壤水分的再分布起到了很大的影响,距离棉花行越远,受到的影响就越小。

Spatial Variability of Soil Moisture on Cotton Field under Mulched Drip Irrigation

In the year 2009,20 soil moisture sample points were measured and for each point,the soil moisture content was measured by three depth in a demonstration area of drip irrigation under membrance in Baotou-lake Farm of Korla Xinjiang Region.The temporal and spatial variability of soil moisture in cotton growing period was analyzed by traditional and geostatistical methods.The result showed that when soil texture was sandy loam,spatial variability of soil moisture belonged to weak variation;as cotton growed,the distribution of soil moisture tend to homogenize;in the main growing period,the best semivariogram model used to study the distribution of soil moisture was spherical model;the relationship between the soil moisture and the distance of one point to the drip irrigation pipe was negative;the effect of cotton lines to soil moisture redistribution was great and the longer the distance was,the weaker the effect was.