Net ecosystem production (NEP) of boreal bogs in Finland under climate change scenarios - Using tree rings to reconstruct past NEP, C-flux measurements to estimate present NEP and General Circulation Models to project future NEP

气候变化情景下芬兰北方沼泽的净生态系统生产 (NEP) - 使用树木年轮重建过去的 NEP，使用碳通量测量来估计当前的 NEP，并使用大气环流模型来预测未来的 NEP

• 批准号: 5440502
• 负责人: Professor Dr. Martin Wilmking, Ph.D.
• 金额: --
• 依托单位: Arbeitsgruppe Landschaftsökologie und Ökosystemdynamik
• 依托单位国家: 德国
• 项目类别: Emmy Noether International Fellowships
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5440502?language=en
• 关键词: Net; ecosystem; production; NEP; boreal

Climate Warming strongly affects boral peatlands and these ecosystems feed-back to climate. Important feedbacks are: 1) Carbon is stored under present conditions in boreal peatlands, reducing atmospheric CO2 concentrations (carbon sink) 2) Boreal peatlands release methane (CH4 source). Warmer and drier conditions might switch boreal peatlands from carbon sink to carbon source, because higher decoposition rates will likely increase CO2 efflux (Feedback 1). However, CH4 efflux (Feedback 2) will likely decrease. Te relative importance of both fluxes is unclear today and a comprehensive assessment of northern European peatlands under warming scenarios is missing. Here, I propose to study fluxes of CO2, CH4 and Dissolved Organic Carbon at boreal bogs in Finnland. Cooperating with Finish partners, I will combine five methods to 1) identify carbon fluxes at plot level, 2) investigate the spatial variability of these fluxes, 3) use tree rings to reconstruct recent change in net ecosystem production and water level (which controls CH4/CO2 efflux) 4) scale results up using IKONOS imagery and 5) ultimately project carbon fluxes for the 21st century using output from General Circulation Models. This unique and powerful approach promises spatially explicit results of the complete carbon balance of boreal bogs in northern Europe and their present and future carbon fluxes under climate warming.

气候变暖强烈影响硼泥和这些生态系统的喂养供应气候。重要的反馈是：1）碳在当前条件下存储在北方泥炭地中，降低了大气二氧化碳浓度（碳汇）2）北方泥炭地释放甲烷（CH4来源）。温暖和较干燥的条件可能会将北方泥炭地从碳水槽转换为碳源，因为较高的反置率可能会增加二氧化碳外排（反馈1）。但是，CH4外排（反馈2）可能会减少。今天尚不清楚这两种通量的相对重要性，在变暖场景下对北欧泥炭地进行了全面评估。在这里，我建议在芬兰的北方沼泽中研究二氧化碳，CH4和溶解有机碳的通量。 Cooperating with Finish partners, I will combine five methods to 1) identify carbon fluxes at plot level, 2) investigate the spatial variability of these fluxes, 3) use tree rings to reconstruct recent change in net ecosystem production and water level (which controls CH4/CO2 efflux) 4) scale results up using IKONOS imagery and 5) ultimately project carbon fluxes for the 21st century using output from General Circulation Models.这种独特而有力的方法有望在北欧北欧北欧沼泽完全碳平衡及其在气候变暖下的当前和未来碳通量的碳平衡上。