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Transformation of organic carbon in the terrestrial-aquatic interface

陆地-水界面有机碳的转化

基本信息

批准号：
237042772
负责人：
Professor Dr. Michael Mutz
金额：
--
依托单位：
Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/237042772?language=en
关键词：
Transformation organic carbon terrestrial aquatic

项目摘要

The overarching goal of our proposal is to understand the regulation of organic carbon (OC) transformation across terrestrial-aquatic interfaces from soil, to lotic and lentic waters, with emphasis on ephemeral streams. These systems considerably expand the terrestrial-aquatic interface and are thus potential sites for intensive OC-transformation. Despite the different environmental conditions of terrestrial, semi-aquatic and aquatic sites, likely major factors for the transformation of OC at all sites are the quality of the organic matter, the supply with oxygen and nutrients and the water regime. We will target the effects of (1) OC quality and priming, (2) stream sediment properties that control the advective supply of hyporheic sediments with oxygen and nutrients, and (3) the water regime. The responses of sediment associated metabolic activities, C turn-over, C-flow in the microbial food web, and the combined transformations of terrestrial and aquatic OC will be quantified and characterized in complementary laboratory and field experiments. Analogous mesocosm experiments in terrestrial soil, ephemeral and perennial streams and pond shore will be conducted in the experimental Chicken Creek catchment. This research site is ideal due to a wide but well-defined terrestrial-aquatic transition zone and due to low background concentrations of labile organic carbon. The studies will benefit from new methodologies and techniques, including development of hyporheic flow path tubes and comparative assessment of soil and stream sediment respiration with methods from soil and aquatic sciences. We will combine tracer techniques to assess advective supply of sediments, respiration measurements, greenhouse gas flux measurements, isotope labeling, and isotope natural abundance studies. Our studies will contribute to the understanding of OC mineralization and thus CO2 emissions across terrestrial and aquatic systems. A deeper knowledge of OC-transformation in the terrestrial-aquatic interface is of high relevance for the modelling of carbon flow through landscapes and for the understanding of the global C cycle.

我们建议的首要目标是了解有机碳(OC)在陆地-水生界面上从土壤到热带水和淡水区的转化规律，重点是短暂的溪流。这些系统极大地扩展了陆地-水生界面，因此是密集有机碳转化的潜在场所。尽管陆生、半水生和水生不同地点的环境条件不同，但所有地点有机碳转化的主要因素可能是有机物的质量、氧气和营养物质的供应以及水情。我们将针对(1)有机碳质量和启动的影响，(2)控制表层沉积物氧气和营养物质平流供应的水系沉积物特性，以及(3)水状况。与沉积物相关的代谢活动、C翻转、微生物食物网中的C流动以及陆生和水生有机碳的组合转化的响应将在补充的实验室和野外实验中被量化和表征。类似的中观实验将在陆地土壤、短暂和多年生溪流以及池塘岸边进行，将在实验鸡溪流域进行。这个研究地点是理想的，因为有一个宽阔但明确的陆地-水生过渡地带，而且由于不稳定的有机碳的背景浓度很低。这些研究将受益于新的方法和技术，包括开发地下水流通道管，以及用土壤和水科学的方法比较评估土壤和水系沉积物的呼吸作用。我们将结合示踪技术来评估沉积物的对流供应、呼吸测量、温室气体通量测量、同位素标记和同位素自然丰度研究。我们的研究将有助于理解有机碳的矿化作用，从而有助于理解陆地和水生系统的二氧化碳排放。对陆地-水生界面有机碳转化的深入了解，对于模拟景观中的碳流和理解全球碳循环具有很高的相关性。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Importance of advective mass transfer and sediment surface area for streambed microbial communities

DOI：
10.1111/fwb.12856
发表时间：
2017
期刊：
Freshwater Biology
影响因子：
2.7
作者：
C. Mendoza‐Lera;Aline Frossard;Matthias Knie;Laura L. Federlein;M. Gessner;M. Mutz
通讯作者：
C. Mendoza‐Lera;Aline Frossard;Matthias Knie;Laura L. Federlein;M. Gessner;M. Mutz

Shading and sediment structure effects on stream metabolism resistance and resilience to infrequent droughts.

遮荫和沉积物结构对河流代谢抵抗力和对罕见干旱的恢复能力的影响