Water as medium for nutrient distribution: Monitoring water distribution between subsoil and topsoil considering roles of biopores and plants, by MRT and pressure probes (WatMed)

水作为养分分布的介质：通过 MRT 和压力探头监测底土和表土之间的水分布，考虑生物孔和植物的作用 (WatMed)

• 批准号: 170046649
• 负责人: Dr. Heike Schneider
• 金额: --
• 依托单位: Arbeitsgruppe IBG-2: Pflanzenwissenschaften
• 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 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/170046649?language=en
• 关键词: Water; medium; nutrient; distribution; Monitoring

Magnetic resonance tomography (MRT) on microcosm soil cores (200 mm Ø) used for CeMiX, comprising naturally stacked subsoil down to 700 mm plus topsoil from CeFiT, will be implemented at a laterally partially open Split 1.5 T magnet, with intended final in-plane spatial resolution of 200 μm. Three-dimensional biopore distributions and dynamics of their formation within the cores will be determined non-invasively and compared to complementing CT analyses of SP 2. One major aim is a non-invasive differentiation of the biopores into earthworm- and root system-originating ones and currently air-, water-, root- and earthwormfilled ones, based on NMR relaxation parameters. Attempts will additionally be made to classify different wall coatings of the biopores with regard to their water affinity. Dynamics of water distribution within the microcosm core and its biopore structures, starting from initial values taken from CeFiT (SP 3), will be documented with an in-plane resolution of 5 mm, in parallel to measurements of root growth dynamics for calculation of biomass and root surface area. Special emphasis will be put on the role of the plant root system for a re-distribution of water/D2O (and solutes) between different soil layers. Finally we will attempt MRT-controlled sample collection from the microcosm cores, to get – together with our research unit partners of SPs 4-8 – repeated access to minimally invasively acquired data on nutrient and microorganism distributions in concert with non-invasively collected water and root distribution data as a basis for dynamic modelling of water and solute circuits in SP 10. Beside the microcosm cores, flat rhizotrons as used in SP 3 will be employed to enable measurements of root and shoot hydrostatic pressure profiles with pressure probes, in addition to MRT measurements. In this way water distributions and corresponding driving forces and growth dynamics will be measured altogether in a minimally invasive manner.

用于CeMiX的微宇宙土芯（200 mm厚）的磁共振断层扫描（MRT），包括自然堆叠的底土，厚度达700 mm，加上来自CeFiT的表土，将在横向部分开放的Split 1.5 T磁体上实施，预期最终平面内空间分辨率为200 μm。三维生物孔的分布和动力学的核心内的形成将确定非侵入性和比较，以补充CT分析的SP 2。一个主要的目的是一个非侵入性的分化的生物孔隙成植物和根系起源的和目前的空气，水，根和蚯蚓填充的，基于NMR弛豫参数。此外，还将尝试根据其亲水性对生物孔的不同壁涂层进行分类。从CeFiT（SP 3）的初始值开始，将记录微观世界核心及其生物孔结构内的水分布动态，平面内分辨率为5 mm，同时测量根系生长动态，以计算生物量和根系表面积。将特别强调植物根系在不同土层之间重新分配水/D2 O（和溶质）的作用。最后，我们将尝试MRT控制的样品收集从微观世界的核心，得到-与我们的研究单位合作伙伴的SP 4-8 -重复访问微创收购的数据与非侵入性收集的水和根的分布数据作为基础的动态建模的水和溶质回路在SP 10的养分和微生物分布。除了微观世界的核心，平面roottrons中使用的SP 3将被用来使根和芽的静水压力分布与压力探头测量，除了MRT测量。通过这种方式，水分布和相应的驱动力和生长动态将以最小侵入的方式一起测量。