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.

来自地下土壤的养分供应对作物生长的重要性尚不清楚，并且可能因生物孔隙、养分周转率和作物特定根系而异。模拟模型提供了一种方法，可以考虑以综合方式描述植物-土壤系统的营养动态所涉及的过程的复杂性。然而，描述磷和钾与土壤水、土壤碳和氮结合的动态并具体考虑土壤底土和生物孔的方法很少。因此，sp10的主要目标是建立一个农田规模的种植系统模型，该模型考虑土壤养分库、生物孔系统和作物养分需求，描述养分（项目一期重点是磷）从地下土壤到作物的动员和养分通量。采用两步走的方法，在土壤岩心上进行对照实验的结果将用于开发根系发育和养分获取的详细过程模型。这些是推导用于田间尺度种植系统模型的简化算法的基础。后一种模型将被应用于评估，经过长期实验数据的彻底验证，来自土壤和生物孔的养分对不同作物生长的贡献。子项目将建模活动与实验测量相结合，在协作项目中具有强大的集成作用。