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首页> 外文期刊>Aquatic Sciences >Fine particulate organic matter transport dynamics in a small Coastal Plain stream: influence of hydrology and channel morphology
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Fine particulate organic matter transport dynamics in a small Coastal Plain stream: influence of hydrology and channel morphology

机译：沿海小河中细颗粒有机物的运输动力学：水文和河道形态的影响

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Fine particulate organic matter (FPOM) represents a major component of stream organic matter budgets, and its dynamics greatly affect the productivity and metabolism of a stream community. FPOM transport dynamics has been well documented in high-gradient streams with rocky substrates, but information from low-gradient, sandy-bottom streams has been lacking. We estimated FPOM retention patterns in Payne Creek, a 2nd order Coastal Plain stream (USA), under naturally varying hydraulic conditions (discharge and velocity). Corn pollen, as an FPOM analogue, was released along with a conservative solute tracer and the particle retention coefficient (k_p) was calculated by fitting the ratio of total pollen remaining in the water column against the longitudinal transport distance to an exponential decay model. Pollen k_p (n = 4) ranged from 0.034 to 0.214 /m, and particle transport distance (S_p) ranged from 4.7 to 29.7 m. The S_p measured in Payne Creek was in the lowest range of previously reported values, and such rapid particle retention was attributed to the low channel slope and slow current velocity. S_p was significantly correlated to water velocity and the channel friction factor, but not to discharge (Q). Two summer experiments conducted in contiguous stream segments resulted in the shortest (4.7 m) and longest (29.7 m) S_P, despite the similar Q. This was attributed to the segment-scale channel alterations that occurred during the previous winter, which led to very different hydraulic conditions in the two stream segments. In Payne Creek, seasonal changes in hydrology and segment-scale variation in channel morphology were the main factors controlling FPOM transport and retention.
机译：细颗粒有机物（FPOM）代表着河流有机物预算的主要组成部分，其动力学极大地影响着河流群落的生产力和新陈代谢。 FPOM的运输动力学已在具有岩石基质的高梯度流中得到了充分的记录，但缺乏来自低梯度，沙底流的信息。我们估算了自然变化的水力条件（流量和速度）下，二阶沿海平原溪流（美国）佩恩溪的FPOM保留方式。玉米花粉（作为FPOM类似物）与保守的溶质示踪剂一起释放，并通过将残留在水柱中的总花粉与纵向运输距离的比值与指数衰减模型拟合来计算颗粒保留系数（k_p）。花粉k_p（n = 4）为0.034至0.214 / m，颗粒传输距离（S_p）为4.7至29.7 m。在佩恩克里克（Payne Creek）测得的S_p在先前报告的值的最低范围内，而这种快速的颗粒保留能力归因于较低的通道斜率和缓慢的电流速度。 S_p与水速和通道摩擦系数显着相关，但与流量（Q）不相关。尽管Q值相似，但在连续的河段中进行的两个夏季实验却导致最短（4.7 m）和最长（29.7 m）S_P。这归因于上一个冬季发生的段级河道变化，导致两个流段的水力条件不同。在Payne Creek，水文学的季节性变化和河道形态的分段尺度变化是控制FPOM传输和保留的主要因素。

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