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首页> 外文会议>Symposium on Water Resources Systems - Water Availability and Global Change; Jun 30-Jul 11, 2003; Sapporo, Japan >Modelling nitrogen dynamics in an agricultural-forested catchment
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Modelling nitrogen dynamics in an agricultural-forested catchment

机译：对农业森林流域氮动态的建模

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摘要

A spatially distributed nitrogen simulation (DNS) model has been developed to simulate daily nitrogen concentration variation in an agricultural-forested catchment. The model can simulate hydrological processes and various nitrogen processes at the grid cell level, continuously considering plant uptake, atmospheric wet deposition, fertilizer application, mineralization, nitrification and denitrification. The hydrological component is based on the distributed Xinanjiang (DXAJ) rainfall-runoff model, and the nitrogen component simulates key sources and sinks using a series of first-order kinetic equations. In particular, plant growth indices for land-use classes are incorporated to simulate plant uptake variation in accordance with seasonal vegetation cover variations. Model calibrations showed that there is a reasonable agreement between simulated and observed stream nitrate-nitrogen concentration. Sensitivity analysis showed that plant uptake is the key nitrogen sink, whereas agricultural fertilizer application is the key source of nitrogen.
机译：已经开发了空间分布氮模拟（DNS）模型来模拟农业森林集水区的每日氮浓度变化。该模型可以在网格单元水平上模拟水文过程和各种氮过程，并持续考虑植物吸收，大气湿沉降，肥料施用，矿化，硝化和反硝化作用。水文分量基于分布式新安江（DXAJ）降雨径流模型，而氮分量则使用一系列一阶动力学方程来模拟关键源和汇。特别是，结合了土地利用类别的植物生长指数，以根据季节性植被覆盖变化模拟植物吸收变化。模型校准表明，模拟和观察到的物流硝酸盐-氮浓度之间存在合理的一致性。敏感性分析表明，植物吸收是关键的氮汇，而农业肥料的施用是关键的氮源。

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