A macronutrient analysis system for studies of natural and stressed terrestrial and aquatic ecosystems

加拿大亚寒带至亚北极地区的森林、泥炭地和湖泊以植被、土壤和沉积物中的有机物形式储存了大量的大气碳（C），这些碳在气候系统反馈中发挥着关键作用。此外，它们拥有世界上大量的饮用淡水，是重要的生境，支持体育和自给渔业以及林业和矿产自然资源工业。多种区域和全球压力源，包括资源开发，区域大气污染，入侵物种和全球气候变化影响这些生态系统中的碳，营养物质和污染物循环。碳、营养物和污染物动态之间的联系往往是相互交织的，在水文连通性紧密的前寒武纪地盾环境中，高地、湿地和水生环境的生态系统动态也紧密相连。我们需要一个碳和氮（N）分析系统，能够进行液体（地表和土壤沃茨以及土壤和沉积物提取物）和固体（土壤、沉积物、组织）相分析。有机碳和相关的N的分析将使我们的团队来衡量净率的垃圾和土壤分解过程，植物和微生物转移整个北方加拿大森林，湿地和湖泊生态系统，和基板的生物利用度，和生物量，水，土壤和沉积物微生物群落负责矿化的有机物和释放温室气体从这些生态系统。该系统将允许我们的HQP在严重的区域规模的工业污染，气候变化，入侵和林业的背景下，表征生态系统碳储量和通量，有机物生物利用度和微生物生物量在受影响和恢复景观（连接高地湿地湖泊集水区）。

The forests, peatlands and lakes of the sub-boreal to sub-arctic regions of Canada store and vast amounts of atmospheric carbon (C) as organic matter in vegetation, soils, and sediments that play key roles in climate system feedbacks. Further, they contain a large volume of the world's potable freshwater, are vital habitats, and support sport and subsistence fisheries and forestry and mineral natural resource industries. Multiple regional and global stressors ranging including resource exploitation, regional atmospheric pollution, invasive species, and global climate change impact the carbon, nutrient, and pollutant cycling in these ecosystems. Linkages between C, nutrient, and pollutant dynamics are often intertwined, and in Precambrian Shield environments where hydrologic connectivity is tight, ecosystem dynamics of upland, wetland, and aquatic environments are also tightly linked.******We are requesting a C and nitrogen (N) analytical system capable of both liquid (surface and soil waters and soil and sediment extracts) and solid (soils, sediments, tissues) phase analyses. Analysis of organic C and associated N will allow our groups to measure net rates of litter and soil decomposition processes, plant and microbial transfers across northern Canadian forest, wetland, and lake ecosystems, and substrate bioavailability to, and biomass of, water, soil and sediment microbial communities that are responsible for mineralization of organic matter and release of greenhouse gasses from these ecosystems. This system will allow our HQP to characterize ecosystem C stocks and fluxes, organic matter bioavailability, and microbial biomass across impacted and recovering landscapes (connected upland-wetland-lake catchments) in the contexts of severe regional-scale industrial pollution, climate change, invasions, and forestry.