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借助自行设计的直管型和弯管型渗漏计,研究水稻生长期间不同施氮水平下稻田犁底层渗漏水中铵态氮和硝态氮的动态变化,以探寻氮素的渗漏损失规律;利用系统动力学模拟软件Vensim构建氮素转化、循环模型,模拟了氮素在水稻、土壤和水中的迁移转化过程,用2003年杭州余杭区稻田0、75、150、225、300、375kg N·hm-2氮素水平试验结果来校准模型系数,并用2007年相同氮素水平下试验田大田数据来验证模型.从稻田不同供氮水平分次施肥后渗漏水中氮浓度的模拟结果与实测值的比较可知,直管和弯管型渗漏计的模拟数据与实测值的拟合程度较好,说明模型模拟结果可靠,具有应用价值.
Aiming at the dynamic changes of ammonium nitrogen and nitrate nitrogen in the leaking water of paddy plow bottom under different nitrogen levels during rice growth period by using straight tube and elbow leakage meters designed by ourselves, the law of leakage loss of nitrogen ; Using system dynamics simulation software Vensim to construct nitrogen transformation and circulation model to simulate the process of nitrogen transfer and transformation in rice, soil and water. Using 2003, Yuhang District Hangzhou rice paddy 0,75,150,225,300,375kg N · The model coefficients were calibrated using the results of the nitrogen level test of hm-2, and the field data were used to validate the model with field-field data of the same nitrogen level in 2007. Simulation results and observed values of nitrogen concentration in leachate after different levels of nitrogen fertilization Comparison shows that the simulation data of the straight pipe and elbow leakage meter fit well with the measured value, indicating that the model simulation result is reliable and has application value.