Rhizodeposition is the main source of carbon and energy for nutrient mobilization in subsoil (RhizoCNP)

根际沉积是底土中养分动员的碳和能量的主要来源（RhizoCNP）

• 批准号: 170009660
• 负责人: Professor Dr. Yakov Kuzyakov
• 金额: --
• 依托单位: Geographisches Institut
• 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/170009660?language=en
• 关键词: Rhizodeposition; main; source; carbon; energy; Rhizodeposition; main; source; carbon; energy

Rhizodeposition is a very important source of carbon (C) and energy for microorganisms mobilizing nutrients in soil, but no data is available regarding the importance of rhizodeposition in subsoil. This project aims on the estimation of C input into subsoil, tracing the root-derived C in biopores formed by roots and earthworms, calculation of the budget of root-derived C and its contribution to nutrient mobilization in subsoil. Plants with different root systems (chicory and alfalfa) will be labeled in field by 13CO2 and under controlled conditions by 13C and 14C. Subsequently, the C budget will be followed by both isotopes including incorporation into microbial molecular markers (13C-PLFA) and biopore coatings. Rhizosphere extension in the subsoil will be estimated by analyzing distribution profiles of root-derived C (14C) and depletion of N (15N), P (33P), and K, depending on distance to root and along individual roots (by 14C phosphor-imaging). Availability of nutrients (N, P) in subsoil and biopores and nutrient mobilization by root exudates will be tested in batch experiments. An approach to evaluate the origin of individual biopores will be developed based on composition of lipid biomarkers. The subproject will deliver parameters for modeling of C flow within and into the subsoil, rhizosphere extension, diffusion profiles of nutrients and root exudates, and nutrient availability depending on distance to roots.

根瘤菌是碳（C）和微生物的能量来源的来源，动员了土壤中的养分，但没有关于Rhizodeposition在地下土壤中的重要性的数据。该项目的目的是估计C对地下土壤的估计，从根和earth形成的生物孔中追踪了根源的c，其计算根源C的预算以及其对底土营养动员的贡献。具有不同根系的植物（Cocory和Alfalfa）将在13CO2的现场标记，并在13C和14C的受控条件下标记。随后，C预算将遵循同位素，包括掺入微生物分子标记（13C-PLFA）和Biopore涂层中。通过分析根源C（14C）的分布分布和N（15n），P（33p）和K的耗竭，取决于沿根部和沿单个根根的距离（通过14C磷光体成像），将估算底土的根际延伸。在批处理实验中，将测试底土和生物孔的营养（N，P）以及根渗出液的营养动员。一种评估单个生物孔的起源的方法将根据脂质生物标志物的组成而开发。该子项目将提供用于在地下和地下土壤中建模的参数，根际延伸，营养和根渗出液的扩散曲线以及养分可用性，具体取决于与根的距离。