城市污水不同土地处理条件下土壤-作物系统中氮净化模拟模型与模拟分析

通过温室条件下冬小麦不同种植方式、污水不同土地处理状态下水氮运移吸收和净化过程模拟试验，分析了作物生长、根系生长与分布、根系对水分氮素吸收规律以及根系竞争吸收与土壤中水、氮含量的关系，以及氮净化规律等．在此基础上，建立了作物生长→根系生长与分布→根系吸水、吸氮→土壤中水氮运移转化→作物生长循环计算联合模型．以模拟试验为背景，用数值模拟分析了城市污水不同水氮土地处理条件下作物生长与土壤─作物系统中水氮运移吸收转化过程和土壤中氮净化机理．为建立环境地学工程的分支模型──污水土地处理控制模型提供了基础模拟计算方法．

MODELING NITROGEN REMOVED IN SOIL-CROP SYSTEM UNDER THE CONDITION OF URBAN WASTEWATER LAND THEATMENT

Based on the simulation experiments of nitrogen transport, transformation,uptaking and nitrogen removed under the different condition of wastewater land treatmen in the greenhouse, growth of crop, growth and distribution of roots, uptaking pattern of water by roots, the relationship between competitive uptaking and water, nitrogen content in soil, etc.,was analyzed, and an united computing model of crop growth, distribution of roots, water and nitrogen uptaking by roots and transformation in soil-crop system was developed. According to simulating experiments, numerical modeling and analyzing of crop growth status,root growth condition and water, nitrogen movement, uptaking and transformation, and nitrogen removed process under different watering and nitrogen pollution conditions were made and the model was calibrated by observing data. It provided a primary computing method for selecting an efficient , productive watering and wastewater irrigating plan, namely Urban wastewater land treatment controlling plan.