Impacts of water level on metabolism and transient storage in vegetated lowland rivers: Insights from a mesocosm study
Impacts of water level on metabolism and transient storage in vegetated lowland rivers: Insights from a mesocosm study
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水位对植被低地河流新陈代谢和瞬时储存的影响：来自中生态系统研究的见解
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Krause
中科院分区：
文献类型：
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作者：
M. Kurz;J. Drummond;E. Martí;J. Zarnetske;J. Lee;M. Klaar;S. Folegot;T. Keller;A. Ward;J. Fleckenstein;T. Datry;D. Hannah;S. Krause
水的瞬时储存区代表了河流中代谢活动的潜在热点。在低地河流中，大量的沉水植被可以增加水的瞬时储存，生物活性表面积，并最终增加流中的代谢活动。影响水生植被存在的气候和人为因素导致的流量变化也会影响流内代谢和营养循环。我们调查了水柱深度对水生植被覆盖的影响及其对水的瞬时储存和相关的代谢活动流围隔（n = 8），代表典型条件的低地流。进行代谢反应性（刃天青-试卤灵）示踪剂的连续注射，并用于量化水力运输和整个围隔有氧呼吸。醋酸盐，一种不稳定的碳源，在示踪剂注射的第二阶段期间加入，以研究代谢反应。我们观察到更高的植被覆盖率和刃天青吸收速度，作为一个代理的围隔呼吸，随着水柱深度的增加。醋酸盐注射液对代谢活性有轻微的积极影响。一个水动力学模型估计了水的传输和保留特性和一阶反应三个mesocosm。这些结果表明，植被覆盖的地表水和沉积物有助于代谢活跃的瞬时存储内的中生态系统，与植被有更大的影响生态系统呼吸。我们的研究结果表明，影响低地河流流量和沉水植被的气候和外部因素将导致河流呼吸动态的变化，并且沉水植被是河流呼吸特别重要和敏感的位置。
Transient storage zones for water represent potential hot spots for metabolic activity in streams. In lowland rivers, the high abundance of submerged vegetation can increase water transient storage, bioreactive surface areas, and, ultimately, in‐stream metabolic activity. Changes in flow resulting from climatic and anthropogenic factors that influence the presence of aquatic vegetation can also, thereby, impact in‐stream metabolism and nutrient cycling. We investigated the effects of water column depth on aquatic vegetation cover and its implications on water transient storage and associated metabolic activity in stream mesocosms (n = 8) that represent typical conditions of lowland streams. Continuous injections of metabolically reactive (resazurin‐resorufin) tracers were conducted and used to quantify hydraulic transport and whole‐mesocosm aerobic respiration. Acetate, a labile carbon source, was added during a second stage of the tracer injection to investigate metabolic responses. We observed both higher vegetation coverage and resazurin uptake velocity, used as a proxy of mesocosm respiration, with increasing water column depth. The acetate injection had a slight, positive effect on metabolic activity. A hydrodynamic model estimated the water transport and retention characteristics and first‐order reactivity for three mesocosms. These results suggest that both the vegetated surface water and sediments contribute to metabolically active transient storage within the mesocosms, with vegetation having a greater influence on ecosystem respiration. Our findings suggest that climate and external factors that affect flow and submerged vegetation of lowland rivers will result in changes in stream respiration dynamics and that submerged vegetation is a particularly important and sensitive location for stream respiration.
严重反季节干旱期间底栖和潜流区无脊椎动物群落组成的变化
影响因子：
1.8
作者：
Stubbington R
通讯作者：
Stubbington R
影响因子：
3.3
作者：
Gurnell, Angela
通讯作者：
Gurnell, Angela