玉米水分管理动态知识模型的设计与实现

农田水分管理与模型构建一直是农业生产的一个热点和难点问题。运用知识模型的构建原理，将系统分析方法和数学建模技术应用于玉米水分管理专家知识表达体系中，根据土壤水分平衡原理，分阶段定量灌溉与玉米和环境影响因子之间的关系，建立了具有系统性和适用性的玉米水分管理动态知识模型，可用于设计不同地区不同降雨年型玉米生育期所需的灌溉定额和灌水定额。利用北京昌平、山东泰安、辽宁沈阳3个不同地区的常年气象资料和玉米品种农大108的品种特征资料对不同生态点常年气候条件下玉米水分管理模型进行了检验；利用北京昌平区不同降雨年型气象

Design and implementation of dynamic knowledge model for maize water management

Field irrigation management and model establishment are always a core and difficult content in crop simulation. The research focused on exerting the establishment theory of knowledge model, and applying the systematic analysis method and mathematic modeling technology to knowledge expression system of maize water management, based on soil water balance, a dynamic knowledge model with systematic and wide-application characteristics for maize water management was developed, after quantifying the relationship of irrigation to cultivars' characteristics and environmental factors periodically. Cases were studied on the knowledge model with the data sets of normal year in different eco-sites and those of different rainfall years in the same eco-site. The results show that there is no difference on saving water in normal year under different eco-sites, irrigation ration changes with eco-sites(Table 3); more difference in different rainfall years of the same eco-site, which is 8.6% in more rainfall year and 31.9% in normal rainfall year(Table 4), and irrigation in seeding does not change with year, but in Knurling and Filling they do. Irrigation system designed by the model is coherent to the actual planting system well. This indicates that the model has good decision-making ability and applicability.