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还田秸秆的分解与氮素释放动态是作物养分管理的重要依据 ,建立了秸秆分解氮素释放动态的“整吞”式动态模拟模型。模型由秸秆有机质分解和残余有机质含氮率动态模拟两部分组成。有机质分解的温度效应用指数函数描述 ,水分效应用分段线性函数描述 ,用“标准天”反映温度与水分的综合影响。残余有机质含氮率动态变化用“标准天”为变量的函数模拟 ,初始秸秆含氮量与残余秸秆含氮量之差即为秸秆分解的氮素净释放。“整吞”式较之“吃馅饼”式建模构思 ,所需参数少且易通过实验获得 ,增加了模型的可用性。利用在淮北滨海地区小麦的试验资料对模型的有效性进行了验证
Straw decomposition and nitrogen release dynamic is an important basis for crop nutrient management. A dynamic model of “whole swallow” dynamic model of straw decomposition nitrogen release was established. The model consists of straw organic matter decomposition and residual organic matter nitrogen dynamic simulation of two parts. The temperature effect of organic matter decomposition is described by an exponential function, and the water effect is described by a piecewise linear function. The “standard day” is used to reflect the combined effects of temperature and moisture. The dynamic change of nitrogen content in residual organic matter was simulated by the function of “standard day” as a variable. The difference between the initial nitrogen content in the straw and the residual nitrogen content in the residual straw was the net nitrogen release from straw decomposition. Compared with the modeling idea of “eating pie”, “swallowing” style requires less parameters and can be obtained experimentally, increasing the usability of the model. The validity of the model was verified by using the experimental data of wheat in the coastal area of Huaibei