非充分灌溉预报土壤水分下限值的分析研究

Research on Analysis of the Low Limits of Soil Moisture under Insufficient Irrigation Forecasting

根据山西临汾灌溉试验站2009年与2010年冬小麦试验资料,采用田间试验与理论分析相结合的研究方法,利用PS123作物生长模型,计算得出5种水文年型冬小麦潜在蒸发蒸腾量。以产量最大为目标,建立灌溉制度优化模型,确定5种水文年型优化灌溉制度。通过实际应用进行了检验,得出:冬小麦非充分供水条件下灌溉预报土壤水分下限值的理论计算方法,进一步完善了非充分灌溉预报理论,利于灌区动态计划用水与水资源优化配置,对于加强灌区用水管理、提高灌区用水效率具有重大的推动作用。

According to the winter wheat test data in 2009 and 2010,which come from irrigation experiment station in Linfen,Shanxi,the winter wheat potential evaporation in 5 different hydrological year has been calculated by using the method of theoretical analysis combining with field experiment and PS123 crop growth model.By taking maximum production as an object,the model of irrigation system optimization was established.As a result,the optimized irrigation system in 5 different hydrological years was determined.After inspecting in the practical application,the theoretical calculation method of the low limits of soil moisture of winter wheat irrigation prediction under insufficient water supplying conditions was obtained.It further perfected the theory of insufficient irrigation as well as being in favor of dynamic planning water use and optimization water distribution in irrigation district.It has played a great role in strengthening the water using management and improving the water using efficiency in irrigation district.