Bioaccessibility and bioavailability of subsoil P

底土磷的生物可及性和生物利用度

• 批准号: 259474743
• 负责人: Professor Dr. Wulf Amelung
• 金额: --
• 依托单位: Arbeitsgruppe Bodenkunde und Bodenökologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/259474743?language=en
• 关键词: Bioaccessibility; bioavailability; subsoil

In our current studies we found that P is enriched in subsoil biopore systems but not bioaccessible in the bulk subsoil. Evidence for the latter conclusions was derived by missing isotope equilibria between subsoil phosphates and soil water. This project was no designed to test the hypotheses that (i) the delta18O signature of phosphates indicate higher bioaccessibility of P in biopore walls than in the bulk soil, (ii) subsoil roots may readily acquire P from minerals, (iii) plant phosphates reflect at least partly the delta18O signature of soil phosphates, (iv) the degree of subsoil P uptake increases when the surface soil is deficient in nutrients and water, and that (v) higher P-accessibility in hotspots can be implemented in R-SWMS, allowing for estimating P uptake from the subsoil more precisely. To achieve these goals we will apply 18O isotope exchange experiments between soil phosphates and water, perform radioactive and stable isotope tracing experiments with soil and triple-labeled apatite (44Ca, 33P, 18O) as well as a numerical modeling of nutrient acquisition by the roots.

在我们目前的研究中，我们发现磷在底土生物孔系统中富集，但在主体底土中无法被生物利用。后一个结论的证据来自于地下磷酸盐和土壤水之间缺失的同位素平衡。该项目并非旨在测试以下假设：(i) 磷酸盐的 delta18O 特征表明生物孔壁中磷的生物可利用性高于散装土壤，(ii) 底土根部可能很容易从矿物质中获取磷，(iii) 植物磷酸盐至少部分反映了土壤磷酸盐的 delta18O 特征，(iv) 当 表层土壤缺乏养分和水分，并且 (v) R-SWMS 可以在热点地区实现更高的磷可及性，从而可以更准确地估计地下土的磷吸收量。为了实现这些目标，我们将在土壤磷酸盐和水之间应用 18O 同位素交换实验，用土壤和三重标记磷灰石（44Ca、33P、18O）进行放射性和稳定同位素示踪实验，以及根部吸收养分的数值模拟。

项目成果

A new model for root growth in soil with macropores

• DOI: 10.1007/s11104-016-3144-2
• 发表时间: 2017-06-01
• 期刊: PLANT AND SOIL
• 影响因子: 4.9
• 作者: Landl, Magdalena;Huber, Katrin;Vereecken, Harry
• 通讯作者: Vereecken, Harry

CRootBox: A structural-functional modelling framework for root systems

CRootBox：根系统的结构功能建模框架

• DOI: 10.1101/139980
• 期刊: bioRxiv
• 作者: Schnepf;Leitner;Morandage;Zoerner;Vanderborght;Vereecken
• 通讯作者: Vereecken