Modelling nutrient acquisition from the sub-soil for different crops with specific consideration of bio-pores (NutrAcMod)

针对不同作物从底土获取养分的情况进行建模，特别考虑生物孔 (NutrAcMod)

• 批准号: 170047048
• 负责人: Professor Dr. Frank Ewert
• 金额: --
• 依托单位: Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e.V.
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/170047048?language=en
• 关键词: Modelling; nutrient; acquisition; sub; soil

The importance of nutrient supply from the sub-soil for crop growth is not well understood and may vary depending on bio-pores, nutrient turnover rates and the crop specific root systems. Simulation modelling provides a means to consider the complexity of the processes involved to describe the nutrient dynamics of the plant-soil system in an integrated way. However, approaches that describe the dynamics of phosphorus and potassium in combination with soil water, soil carbon and nitrogen and specifically consider the sub-soil and the bio-pores herein are scarce. Accordingly, the main objective of SP 10 is to develop a field-scale cropping system model which describes nutrient (emphasis in the 1st phase of the project is on phosphorus) mobilization and nutrient fluxes from the sub-soil to the crops considering soil nutrient pools, the bio-pore system and the crop nutrient demand. A two step approach is followed in which results from controlled experiments on soil cores will be used to develop detailed process models of root development and nutrient acquisition. These are the basis for deriving simplified algorithms to be used in a cropping system model for the field scale. The latter model will be applied to assess, after thorough validation with data from long-term experiments, the contribution of nutrients from the sub-soil and bio-pores to the growth of different crops. The sub-project combines modelling activities with experimental measurements and has a strong integrating role within the collaborative project.

底土的养分供应对作物生长的重要性尚未得到很好的理解，并且可能取决于生物孔隙、养分周转率和作物特定的根系。模拟建模提供了一种手段，考虑所涉及的过程的复杂性，以综合的方式描述植物-土壤系统的养分动态。然而，结合土壤水分、土壤碳和氮来描述磷和钾的动态变化，并特别考虑土壤下层和生物孔隙的方法很少。因此，SP 10的主要目标是开发一个田间规模的种植系统模型，该模型考虑到土壤养分库、生物孔隙系统和作物养分需求，描述养分（项目第一阶段的重点是磷）从底土到作物的流动和养分通量。一个两步的方法，其中控制实验的结果将被用来开发详细的过程模型的根发育和养分的收购。这些都是基础，推导出简化算法中使用的种植系统模型的领域规模。后一个模型将在经过长期实验数据的全面验证后，用于评估底土和生物孔隙中的养分对不同作物生长的贡献。该分项目将建模活动与实验测量相结合，在合作项目中具有很强的整合作用。