南疆地区棉花整个生育期内土壤水分空间变异性分析

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,以45m×54m(一根支管控制)范围为试验区,采用网格布点的方式取样(共计64个采样点),测定了各个采样点以及三个不同深度上的土壤含水率.采用经典统计学和地统计学方法,分析了棉花整个生育期内的土壤水分空间变异特性:认为土壤含水率的提高可增强其空间变异能力;影响土壤水分空间变异能力的主要因素是结构性因素;土壤含水率的空间分布格局随着土壤含水率的增大而趋向复杂,由随机因素引起的变异有增大的趋势,这与滴灌带毛管灌水的不均匀性有关.

Analysis on the Spatial Variability of Soil Moisture for Whole Cotton Growing Season in South Xinjiang

Total 64 soil moisture sample points were designed by the grid pattern in an experimental area of 45 m×54 m (approximately a branch pipe control)in a demonstration area of drip irrigation under membrance in Baotouhu Farm of Korla Xinjiang. For each soil sample point, the soil moisture content was measured by three depths. The spatial variability of soil moisture in whole cotton growing period was analyzed by the traditional and geostatistical methods.The result showed that the increase of soil moisture can enhance the spatial variability ability; Main factor to effect the spatial variability is structural factor; The spatial distribution of soil moisture becomes complicated with the soil moisture increment, the variability caused by random factor has an increasing trend which is related to the non uniformity by drip irrigation.