论文部分内容阅读
定量描述农田土壤-作物系统中水氮迁移转化规律,对水氮资源高效利用和水土环境保护具有重要的意义。以土壤水、热和溶质迁移转化动力过程为基础,综合考虑气象因素变化和土壤水氮动态变化及其对作物生长的影响,构建了土壤水、热、氮迁移转化与作物生长耦合模拟模型。并应用该模型对2007-2008年冬小麦生育期内的土壤水分、氮素转化运移以及冬小麦产量、生物量、腾发量(ET)进行模拟,模拟结果与实测数据均吻合良好。可应用该模型模拟不同作物种类、不同灌水施肥条件下土壤水分与氮素动态变化过程和作物生长状况,进而获得农田水肥优化管理模式。
Quantitative description of farmland soil - crop water and nitrogen migration and transformation rules, the efficient use of water and nitrogen resources and the protection of water and soil environment is of great significance. Based on the dynamic processes of soil water, heat and solute transfer and transformation, a coupled simulation model of soil water, heat, nitrogen migration and transformation and crop growth was constructed considering the change of meteorological factors and the dynamic changes of soil water and nitrogen and their effects on crop growth. The model was applied to simulate soil water and nitrogen translocation and winter wheat yield, biomass and evapotranspiration (ET) during the growth period of winter wheat in 2007-2008. The simulation results are in good agreement with the measured data. This model can be used to simulate the dynamic process of soil moisture and nitrogen dynamics and crop growth under different types of crops and under different irrigation and fertilization conditions, and then obtain the optimal management mode of water and fertilizer on farmland.