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Use of modelling to understand nutrient acquisition by plants

机译：使用建模了解植物的养分吸收

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The definition, testing and uses of explanatory models in plant nutrition are discussed and contrasted with descriptive, predictive models. Two examples are given. First a model of phosphorus acquisition by rice plants growing in soils that undergo flooding and drainage, in which changes in the soil induced by roots are important. The changes are, in flooded anaerobic soil, oxidation of mobile reductants and consequent production of H+ ions in the soil as well as direct release of H+ ions from the roots to balance excess intake of cations over anions; and in non-flooded aerobic soil, release of organic anions from the roots. The model's predictions are tested against experimental data. Second a model of N acquisition by rice plants in flooded anaerobic soil, in which the uptake properties of the roots are important. The contribution to N uptake of NO3- formed in the rhizosphere of rice in flooded soil is compared with that of NH4+ from the bulk soil using a model and absorption properties of rice roots measured in nutrient culture. The models' uses and limitations are discussed.
机译：讨论了植物营养中解释性模型的定义，测试和使用，并与描述性，预测性模型进行了对比。给出两个例子。首先，水稻在生长于洪水和排水条件下的土壤中吸收磷的模型非常重要，其中根系引起的土壤变化很重要。在淹没的厌氧土壤中，这些变化是可移动还原剂的氧化和随之而来的土壤中H +离子的产生，以及H +离子从根部的直接释放，以平衡阳离子与阴离子的过量摄入。在非淹没的需氧土壤中，从根部释放出有机阴离子。针对实验数据测试了模型的预测。第二种是在淹水的厌氧土壤中水稻植物吸收氮的模型，其中根的吸收特性很重要。使用营养养分测量的模型和水稻根系的吸收特性，将水稻在根际中根际中形成的NO3对氮吸收的贡献与从散状土壤中NH4 +对氮的吸收的贡献进行了比较。讨论了模型的用途和局限性。

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