Erosion-induced Impact on Carbon Dynamics in the Crop-Rhizosphere Microbiome-Soil Organic Matter-Continuum (CropRhizoSOM)

侵蚀引起的对作物根际微生物组-土壤有机质连续体（CropRhizoSOM）碳动态的影响

• 批准号: 431061957
• 负责人: Professor Dr. Jürgen Augustin
• 金额: --
• 依托单位: Arbeitsgruppe ​Isotopen-Biogeochemie und Gasflüsse
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/431061957?language=en
• 关键词: Erosion; induced; Impact; Carbon; Dynamics

The magnitude and mechanistic impact of soil erosion on changes of soil carbon stocks are not resolved to date. Croplands can be considered as one important type of ecosystem to improve carbon sequestration, since they cover 14 million square kilometres of earth land surface, store one-tenth of the global soil organic carbon, and are continuously managed. An understanding of the mechanisms responsible for erosion impact on soil carbon dynamics and storage is a prerequisite for a quantification of the significance of erosion on the carbon source and sink functions of croplands. We aim for a substantial contribution to this unresolved topic. The proposed project will investigate the effect of mixing of different amounts of subsoil in a topsoil (Ap horizon) on key processes of carbon dynamics in a Crop-Rhizosphere Microbiota-Soil Organic Matter Continuum (CropRhizoSOM). The consortium will conduct 14C-tracer-based pot experiments with spring barley, in which a non-eroded Ap material from the experimental site CarboZALF-D (control, without Bt incorporation), a moderately eroded Ap material (with 20% Bt material) and strongly eroded Ap material (with 40% Bt material) will be comparatively analyzed. CropRhizoSOM will quantitatively determine and balance (I) carbon fluxes and allocation rates, (II) the functional adaption of the soil microbiota (gene markers, metagenomes, soil enzymes), and (III) the dynamics of organic carbon in various soil particle size fractions at different growth stages and in the following fallow period. Subsequently, we will identify which carbon pools were primarily accessed by the crop and the microbiota. On the basis of all results, a conceptual model considering flux rates and functional changes of the microbiota will be developed. Such a conceptual model will lay the foundations for subsequent experiments and adaptations in soil carbon models by future efforts.

迄今为止，尚未解决土壤侵蚀对土壤碳储量变化的大小和机械影响。农田可以被视为一种重要的生态系统类型，以改善碳固换，因为它们覆盖了1400万平方公里的地面土地表面，存储了全球土壤有机碳的十分之一，并且不断管理。对负责侵蚀影响土壤碳动态和储存的机制的理解是量化侵蚀对农田碳源和水槽功能的重要性的先决条件。我们的目标是为这个尚未解决的主题做出重大贡献。拟议的项目将研究表层土壤（AP地平线）中不同量的地下土壤混合对作物 - 腐球微生物 - 土壤有机物连续体（CROPRHIZOSOM）中碳动力学关键过程的影响。该财团将对春季大麦进行14C追踪的锅实验，其中实验现场Carbozalf-D（对照，没有BT Incorporated）的未擦除AP材料，中等侵蚀的AP材料（具有20％BT材料）（具有20％BT材料），并且对AP材料进行了强烈腐蚀的AP材料（40％BT材料）将进行相对分析。 Croprohizosom将定量确定和平衡（i）碳通量和分配速率，（ii）土壤微生物群（基因标记物，元基因组，土壤酶）的功能适应，以及（iii）在不同生长阶段和下一个秋季的各种土壤粒度分数中有机碳的动态。随后，我们将确定哪些碳池主要是由农作物和微生物群进入的。基于所有结果，将开发一个考虑通量速率和功能变化的概念模型。这样的概念模型将通过未来的努力为随后的实验和土壤碳模型的适应奠定基础。