Tracing the origin of sediments and C across the terrestrial-aquatic continuum: a holistic approach to assess climate change and water quality threat

追踪陆地-水生连续体中沉积物和碳的来源：评估气候变化和水质威胁的整体方法

• 批准号: 2137426
• 金额: --
• 依托单位: CRANFIELD UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2137426
• 关键词: Tracing; origin; sediments; across; terrestrial

Tracing the sources of sediment and organic carbon (OC) in the fluvial environment is key to supporting sustainable land management decisions and maintaining ecosystem services. A recent pilot-study, conducted by the supervisory team, showed that by combining plant-derived biomarkers (n-alkanes) with bulk stable isotopes (13C, 15N) it is possible to distinguish OC and sediment provenance from different land uses3. However, this study highlighted the need for considering other novel tracers, the spatial downscaling of the representation of the identified fluxes will be crucial methodological improvements in this context. Hence, the present PhD study will be the first to develop a modelling approach to identify pathways of OC in a temporal and spatial detailed way (intra-field and intra-annual variability) by consider various existing modern large databases (land use, soil type, remote sensing (MODIS) and topography). This novel approach will be validated by an improved tracing technique based on compound-specific-stable-isotope analyses (CSSIA) of fatty acids and n-alkanes as an independent measure.

在河流环境中追踪沉积物和有机碳（OC）的来源是支持可持续的土地管理决策和维护生态系统服务的关键。由监督团队进行的最近进行的试验研究表明，通过将植物来源的生物标志物（N-烷烃）与散装稳定同位素（13C，15N）相结合，可以将OC和沉积物出处与不同的土地用途区分开来3。但是，这项研究强调了考虑其他新型示踪剂的必要性，在这种情况下，确定通量的表示的空间降低将是至关重要的方法论。因此，本博士研究将是第一个开发建模方法，以时空的详细方式（场外和年龄段变异性）来识别OC的途径，通过考虑各种现有的现代现代大型数据库（土地利用，土壤类型，遥感（MODIS）和地形）。这种新颖的方法将通过基于脂肪酸和N-烷烃的复合特异性稳定 - 同位素分析（CSSIA）作为一种独立的度量来验证。