Alternating Drying and Flowing Phases Control Stream Metabolism Through Short- and Long-Term Effects: Insights From a River Network

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Naiara López-Rojo, Romain Sarremejane, Arnaud Foulquier, Gabriel Singer, Jacob Diamond, Delphine Rioux, Christian Miquel, Stephen Mulero, Clément Lionnet, Francisco J. Peñas, Amaia A. Rodeles, Thibault Datry
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Abstract

Stream metabolism is a key biogeochemical process in river networks, synthesizing the balance between gross primary production (GPP) and ecosystem respiration (ER). Globally, more rivers and streams are drying due to climate change and water abstraction for human uses and this can alter the organic carbon residence time leading to decoupled ER and terrestrial organic matter supply. Although the consequences of drying on CO2 emissions have been recently quantified, its effects on stream metabolism are still poorly studied. We addressed the long-term effects of drying and rewetting events on stream metabolism by monitoring oxygen dynamics at 20 reaches across a drying river network, including perennial (PR) and nonperennial reaches (NPR) for one year. We also calculated several climatic and land use variables and characterized local abiotic conditions and biofilm and sediment communities at five sampling dates. ER was significantly higher in NPR than in PR reaches demonstrating in situ the effects of drying on stream metabolism. When analyzing the long-term drivers of ER and GPP, we found a direct positive effect of drying on ER and a negative effect on GPP. Drying also altered microbial community composition with algal communities from NPRs being different from those in PRs. In the short-term, the total oxygen consumption (respiration) during rewetting events was positively related to the duration of precedent nonflow period. Our results show that drying had an important effect on stream metabolism both in the short- and long term, supporting the need for including NPRs in global estimates of stream metabolism.

Abstract Image

交替干燥和流动阶段通过短期和长期影响控制溪流代谢:来自河流网络的见解
河流代谢是河网中一个重要的生物地球化学过程,它综合了初级生产总值(GPP)和生态系统呼吸(ER)之间的平衡。在全球范围内,由于气候变化和人类用水的抽干,越来越多的河流和溪流正在干涸,这可能改变有机碳的停留时间,导致内质网和陆地有机质供应脱钩。尽管干旱对二氧化碳排放的影响最近已被量化,但其对河流代谢的影响仍未得到充分研究。通过对干旱化河网20个河段(包括多年生河段(PR)和非多年生河段(NPR)进行为期一年的氧动态监测,研究了干湿和复湿事件对河流代谢的长期影响。我们还计算了几个气候和土地利用变量,并在五个采样日期表征了当地的非生物条件和生物膜和沉积物群落。内质网在NPR河段显著高于PR河段,表明干燥对水流代谢的原位影响。在分析ER和GPP的长期驱动因素时,我们发现干燥对ER有直接的正向影响,而对GPP有负向影响。干燥还改变了微生物群落组成,保护区的藻类群落与保护区的不同。在短期内,复湿过程中的总耗氧量(呼吸)与先前不流期的持续时间呈正相关。我们的研究结果表明,干燥在短期和长期对河流代谢都有重要影响,支持将NPRs纳入全球河流代谢估算的必要性。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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