Organic matter degradation through respiration in littoral and pelagial including profundal zones of an oligotrophic lake assessed by electron transport system activity
Organic matter degradation through respiration in littoral and pelagial including profundal zones of an oligotrophic lake assessed by electron transport system activity
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DOI：
10.1007/s10750-009-9906-6
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发表时间：
2009-11-01
期刊：
影响因子：
2.6
通讯作者：
Germ, Mateja
中科院分区：
文献类型：
--
作者：
Simcic, Tatjana;Germ, Mateja
以呼吸电子传递系统(ETS)活性为指标，研究了博欣湖沿岸和中上层包括深水区在内的净浮游动物、微型浮游动物、底栖动物、大型植物和沉积物中呼吸碳损失的强度。比较了这些组分对湖泊特定区域总代谢活性的贡献，确定了沿岸和中上层包括深海呼吸碳损失在内的贡献与浮游植物和大型植物估计的同化碳之间的关系。最大的面积(m~(-2))碳损失是通过滨海带的沉积物，平均占湖滨区段总碳损失的97.6%。该区域的底栖动物(1.2%)、微型浮游动物(0.9%)、大型植物(0.2%)和浮游动物(0.1%)的值明显较低。在上、深部结合带，沉积物占总碳损失的78.8%。浮游动物(13.4%)、浮游动物(7.0%)和底栖动物(0.8%)含量较低。滨海区总面呼吸碳损失量显著高于深水区，但滨海区和深底区对全湖新陈代谢的贡献相似。整个湖泊通过浮游动物、微型浮游生物、底栖动物、沉积物和大型植物的呼吸碳损失超过了浮游植物和大型植物的估计碳生产力。后者在近岸大于上腹部，包括深部。在滨海地区，大型植物对碳生产力的贡献很大，但对呼吸作用的贡献较小，而沉积物对沿海和中上层包括深水地区的呼吸作用贡献最大。
The intensity of respiratory carbon loss through respiration, assessed by respiratory electron transport system (ETS) activity, was studied in net zooplankton, microplankton, zoobenthos, macrophytes and sediment in the littoral and pelagial including profundal zone of Lake Bohinj over a complete year. The contributions of these components to the total metabolic activity in a particular zone of the lake were compared and the relationship between the contributions of littoral and pelagial including profundal respiratory carbon loss and the estimated assimilated carbon in phytoplankton and macrophytes was determined. The greatest areal (m(-2)) carbon loss was observed through sediments in the littoral zone which, on average, contributed 97.6% to total carbon loss in the littoral compartment of the lake. Significantly lower values were observed in this zone for zoobenthos (1.2%), microplankton (0.9%), macrophytes (0.2%) and zooplankton (0.1%). In the combined pelagial and profundal zone, sediments contributed 78.8% to the total carbon loss. Lower values were observed in microplankton (13.4%), followed by zooplankton (7.0%) and zoobenthos (0.8%). Total areal respiratory carbon loss in the littoral significantly exceeded that in the pelagial including profundal zone, but the littoral zone and the pelagial including profundal zone made similar contributions of respiratory carbon loss to whole-lake metabolism. Whole-lake respiratory carbon loss through zooplankton, microplankton, zoobenthos, sediments and macrophytes exceeded the estimated carbon productivity of phytoplankton and macrophytes. The latter was greater in littoral than in pelagial including profundal. In littoral, macrophytes contribute significantly to carbon productivity, but less to respiration, while sediment contributed the greatest part of respiration in both littoral and pelagial including profundal.