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Simulation of field data by a basic three-dimensional model of interactive root growth

机译：通过基本的交互式根部生长三维模型模拟田间数据

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摘要

Published field data for lupins grown in a deep sandy soil in the wheatbelt of south-western Australia were used to test the predictive ability of a model of three-dimensional root growth. The model has the capacity to simulate the growth of individual root sections in response to the supply and demand for water and nitrate. N mineralisation was not modelled explicitly, but was accounted for through the use of a seasonally variable mineralisation input derived from the field data. Simulated nitrogen and water contents and root length densities in the soil profile agreed well with observed profiles, although all were slightly under-predicted. A sensitivity analysis revealed that model predictions were most sensitive to the drained upper limit values (v/v) and the mineralisation rates (μgN m−3 s−1) incorporated as external inputs to the model, along with the unit rate of N2 fixation (mol nodule−1 s−1) and unit root growth rates (μm mol−1 s−1) which are physiological parameters previously calibrated for lupins. The amount of nitrate leached was predicted well. Spatial plots of nitrate leaching were a close inverse of the root length density plots, with the highest nitrate leaching below the inter-plant zones, and the least nitrate leaching directly below each plant. These results suggest that the root distribution of a legume species such as lupin can have an effect on the leaching of nitrate to depth. It may thus be possible to reduce the total amount of nitrate leached under lupin crops by investigating factors such as the spatial deployment of roots, planting densities and intercropping.
机译：在澳大利亚西南部小麦带的深沙质土壤中生长的羽扇豆的已发布田野数据用于检验三维根系生长模型的预测能力。该模型具有模拟各个根部生长的能力，以响应水和硝酸盐的供需。氮的矿化作用没有明确建模，但是通过使用从田间数据中得出的季节性可变矿化作用来解决。土壤剖面中模拟的氮，水含量和根长密度与观测到的剖面吻合得很好，尽管都略有预测不足。敏感性分析表明，模型预测对作为模型外部输入的排水上限值（v / v）和矿化速率（μgNm-3 s-1 ）最敏感，以及N2 固定的单位速率（mol nodule-1 s-1 ）和单位根生长速率（μmmol-1 s-1 ），这是先前为羽扇豆校准的生理参数。浸出的硝酸盐量可以很好地预测。硝酸盐淋溶的空间图与根长密度图的倒排图相反，在植物间区域下方的硝酸盐淋溶量最高，而在每株植物下方的硝酸盐淋溶量最少。这些结果表明，豆科植物如羽扇豆的根部分布可能对硝酸盐渗滤至深处有影响。因此，有可能通过调查诸如根部的空间分布，种植密度和间作等因素来减少羽扇豆作物下浸出的硝酸盐总量。

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  • 来源
    《Plant and Soil》 |2002年第1期|39-54|共16页
  • 作者

    Vanessa M. Dunbabin; Art J. Diggle; Zdenko Rengel;

  • 作者单位

    Department of Soil Science and Plant Nutrition The University of Western AustraliaCentre for Legumes in Mediterranean Agriculture The University of Western AustraliaWestern Australian Department of Agriculture;

    Centre for Legumes in Mediterranean Agriculture The University of Western AustraliaWestern Australian Department of Agriculture;

    Department of Soil Science and Plant Nutrition The University of Western AustraliaCentre for Legumes in Mediterranean Agriculture The University of Western Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    computer modelling; lupins; nitrate leaching; nitrate uptake; nitrogen fixation; soil water content;

    机译：计算机建模羽扇豆硝酸盐浸出硝酸盐吸收固氮土壤水分;

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