Project coordination: Field site management, data synthesis and modeling of subsoil C-turnover

项目协调：现场管理、数据合成和地下碳周转建模

• 批准号: 233497189
• 负责人: Professor Dr. Jörg Bachmann
• 金额: --
• 依托单位: Max-Planck-Institut für Biogeochemie (MPI-BGC)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/233497189?language=en
• 关键词: Project; coordination; Field; site; management

The high 14C age of subsoil organic matter suggests very slow turnover rates. However, analyses of archived soil samples and 14CO2 and DO14C flux measurements indicate that a sub-stantial part of the subsoil C-pool has annual to decadal turnover times and thus contributes to the global Ccycle. Distinct differences in 14C content and microbial activity between preferential flow paths and bulk soil indicate that the long-term stability of soil organic matter (SOM) may also result from its spatial segregation from hot spots of microbial activity. Other subsoil specific factors such as low O2 partial pressure, low temperatures and low moisture dynamics may additionally control SOM turnover. In order to model C-dynamics in subsoils, the influence of these factors with the underlying mechanisms on turnover needs to be understood and quantified wherever possible. In addition, C-fluxes have to be quantified and their sources have to be identified. The central objective of this coordination subproject is to ensure the close collaboration between the subprojects in order to compile and synthesize all relevant results for model development. To this end, the set-up and installation of the subsoil observatories and all field activities like sampling campaigns, flux measurements and additional field experiments will be planned in detail and coordinated by this project. This will be supported by the creation of a web-based common database and communication platform together with a regularly updated table of all activities accessible to all participants. The subsoil observatory will be managed by a technician. The coordinating scientist will regularly call in meetings with the other groups or with subgroups for discussion of results and coordination of experiments. Furthermore he/she will organize a summer school for the participating PhD students and workshops for the communication of results to an international audience. The compiled data on C-fluxes and 14C analyses will be synthesized to gain an improved understanding of C dynamics in subsoils with a conceptual model and it will be used as input parameters for the improvement and adaptation of a numerical model of C-turnover in soils. The development and validation of the numerical model is the task of a PhD-student.

地下有机物的高14c年龄表明离职率非常缓慢。但是，对存档的土壤样品和14CO2和DO14C通量测量的分析表明，底土C-pool的亚替代部分每年至际交换时间，因此有助于全球ccycle。优先流动路径和大块土壤之间的14C含量和微生物活性的明显差异表明，土壤有机物（SOM）的长期稳定性也可能是由于微生物活性的热点的空间分离而导致的。其他底土的特异性因素，例如低O2部分压力，低温和低水分动态可能会控制SOM周转。为了在下土壤中建模C-动力学，需要尽可能了解和量化这些因素对基本机制对离职的影响。此外，必须量化C频率，并且必须确定其来源。该协调子规定的核心目标是确保子弹之间的密切合作，以编译和综合模型开发的所有相关结果。为此，将详细计划和安装底土观测器以及所有现场活动，例如抽样活动，通量测量和其他现场实验，并由该项目进行详细计划。创建基于Web的通用数据库和通信平台以及所有参与者均可访问的所有活动的表格将支持这一点。地下天文台将由技术人员管理。协调的科学家将定期召集与其他小组或子组的会议，以讨论结果和实验协调。此外，他/她将组织一所暑期学校，为参与的博士学位学生和讲习班，以与国际观众联系。使用概念模型的C型和14C分析的编译数据将合成，以提高对下层土壤中C动力学的了解，并将其用作改善和适应土壤中C转向的数值模型的输入参数。数值模型的开发和验证是博士学位学生的任务。