摘要
通过时域反射仪,对不同灌水定额下土壤含水率的变化进行了试验研究,分析了不同灌水定额下的土壤含水率随深度变化的曲线特征。因灌水量不同,土壤水分曲线从＂3＂型到＂7＂型再到＂2＂型曲线,规律性地揭示了灌水量对不同深度土壤水分变化曲线的渐变影响。同时研究了土壤水分运移的时间效应和垂直分布特征,通过图表规律的汇总将0-180 cm土层按其土壤水分运移规律进行划分。土壤湿度的垂直变化可分为4层：活跃层（0-30 cm）;贮水层（30-60 cm）;缓变层（60-100 cm）;均稳层（100-180 cm）。利用克立格法对各试验小区在N-S方向上进行了空间插值分析。采用多项式拟合与峰值拟合探讨这2种拟合方程在土壤含水率垂直分布上的应用。
Under different irrigation conditions fixed spatial variation of soil moisture characteristics,through the Time Domain Reflectometry,fixed under the water for different soil moisture changes in the pilot study were analyzed under different irrigation fixed soil moisture changes with depth curves.Different because of irrigation,soil moisture curve from the ＂3＂ type to ＂7＂ to ＂2＂ type curve,reveals the regularity of irrigation on soil moisture at different depths of the gradient curve of the impact.At the same time to study soil moisture effects of migration time and the vertical distribution of the characteristics of the law through a summary of the chart will be 0 - 180cm soil layer according to the laws of water movement into,the vertical changes in soil moisture can be divided into 4 layers： active layer（0-30 cm）,storage layer（30-60 cm）,slowly decreasing layer（60-100 cm）,are stable layer（100-180 cm）.Kriging use of the experimental plot in the NS direction to the analysis of spatial interpolation.Polynomial fitting using peak fitting with the fitting of these two equations to explore the vertical distribution of soil moisture on the application.
出处
《节水灌溉》
北大核心
2010年第5期28-30,34,共4页
Water Saving Irrigation
基金
国家教育部外专局"干旱半干旱地区水文生态与水安全学科创新引智基地"(B08039)
关键词
土壤含水率
灌水定额
垂直分布
时空变化
soil moisture content
scale irrigation
vertical distribution
temporal and spatial variation
