田面无水层条件下渠灌稻田土壤水分影响因素及预测模型研究

Research on Influence Factors and Prediction Model of Soil Moisture at None-water Layer of Canal Irrigation Paddy

通过田间试验,研究了在田面无水层条件下拔节孕穗期、抽穗开花期及乳熟期等3个主要生育阶段渠灌稻田土壤水分的影响因子及预测模型。相关分析及多元逐步回归分析表明,田间小气候因子中,气温、空气相对湿度及风速对渠灌稻田土壤水分影响较大。误差分析结果也表明,对气温、相对湿度及风速等逐步回归建立的多元线性模型,最大测量误差分别为5.38%、3.35%和3.84%,拟合效果满意。研究成果为田面无水层条件下渠灌稻田土壤水分的预报奠定了基础。

A field experiment was conducted to study influence factors and prediction models of soil moisture at three different growth stages（including jointing booting,heading to flowering and milk stage） at none-water layer of canal irrigation paddy.Correlation analysis and stepping multi-regression analysis suggested that atmospheric temperature in the field,relative humidity and wind were the three main microclimate factors affecting the soil moisture of canal irrigation paddy.Error analysis also showed that the stepping multi-linear regression models of soil moisture established based on major meteorological factors at three different growth stages were satisfying,and the maximum relative errors are 5.38%,3.35% and 3.84% respectively.Research results establish a basis for soil moisture forecast at none-water layer of paddy.