Effects of shallow and deep sediment disturbance on whole-stream metabolism in experimental sand-bed flumes
Effects of shallow and deep sediment disturbance on whole-stream metabolism in experimental sand-bed flumes
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浅层和深层沉积物扰动对实验砂床水槽全流代谢的影响
DOI：
10.1007/s10750-011-0968-x
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发表时间：
2012
期刊：
影响因子：
2.6
通讯作者：
Gessner
中科院分区：
文献类型：
--
作者：
Gerull;Frossard;Gessner
水流引起沙床河流泥沙扰动的复杂模式，但对不同深度的泥沙冲刷和充填对河流新陈代谢的影响知之甚少。我们评估了这样的影响，手动干扰桑迪沉积物的16个实验室外水槽两个不同的深度（1和4厘米）在早期和更先进的阶段流社区演替。为了分离对异养和自养代谢的影响，一半的水槽被永久覆盖。在演替早期，泥沙扰动不影响净群落生产力（NCP），而泥沙混合减少生产力的干扰深度在后期。相比之下，当沉积物混合到更大的深度时，微生物呼吸会受到显着刺激。这些结果表明，扰动沉积物在早期的演替阶段没有影响全流代谢，而在后期阶段，深层沉积物扰动可能会导致一个短暂的转向异养。NCP从扰动中恢复的时间与扰动深度无关。深，浅沉积物扰动后观察到类似的轨迹表明，延迟恢复不只是由于混合藻类到更深的沉积物层，但主要是破坏表层沉积物的精细结构的结果。
Water flow causes complex patterns of sediment disturbance in sand-bed streams, but effects on stream metabolism resulting from different depths of sediment scour and fill are poorly known. We assessed such effects by manually disturbing sandy sediments of 16 experimental outdoor flumes to two different depths (1 and 4 cm) during an early and a more advanced stage of stream community succession. To separate effects on heterotrophic and autotrophic metabolism, half of the flumes were permanently covered. At the early successional stage, sediment disturbance did not affect net community production (NCP), while sediment mixing reduced production independent of disturbance depth in the later stage. Microbial respiration, in contrast, was significantly stimulated when sediment was mixed to greater depth. These results suggest that disturbing sediments during early successional stages has no effect on whole-stream metabolism, whereas at later stages, deep sediment disturbance can lead to a transitory shift toward heterotrophy. The recovery time of NCP from perturbation was independent of disturbance depth. Similar trajectories observed after deep and shallow sediment disturbance indicate that delayed recovery was not simply due to mixing algae into deeper sediment layers but primarily a result of disrupting the fine structure of the surface sediment.
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影响因子：
--
作者：
J. Luce;A. Cattaneo;M. Lapointe
通讯作者：
M. Lapointe
DOI：
--
发表时间：
1991
期刊：
影响因子：
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作者：
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R. Stevenson
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影响因子：
2.6
作者：
W. V. Sobczak;T. Burton
通讯作者：
T. Burton
人工集水区
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
W. Schaaf;W. Gerwin;I. Kögel‐Knabner;J. Zeyer;R. Hüttl
通讯作者：
R. Hüttl
地中海溪流干旱后叠层石生物膜的代谢恢复图：3
影响因子：
1
作者：
A. Romani;S. Sabater
通讯作者：
S. Sabater