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首页> 外文期刊>Aquatic Sciences >Spatial and temporal influences of in-stream factors on the chemistry and epilithic biomasses of upland stream metal deposits
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Spatial and temporal influences of in-stream factors on the chemistry and epilithic biomasses of upland stream metal deposits

机译：入流因素对时空金属矿床化学和表层生物量的时空影响

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摘要

The density and composition of stream bed metal deposits are affected by physical, chemical and biological processes. In this paper we investigate the importance of these processes and their relation to algal and non-photosynthetic detrital (NPD) biomass in a set of upland streams in Northern Ireland. Deposit density and Fe, Mn, Al and P concentrations varied with stream pH across sites but not seasonally. No effects of stream bed erosion or photoreduction were detected on deposit densities. Seasonal variation in stream water metal concentrations was correlated with rainfall. NPD biomass was a significant predictor of both spatial and seasonal variation in deposit concentrations. There were strong, non-linear, relations between NPD biomass and deposit metal concentrations, with Fe and Mn becoming relatively more important and algal biomass declining above threshold deposit/NPD densities. The results suggest that NPD biomass influences deposit density and reduces the biomass of photosynthetic autotrophs above a threshold deposit density.
机译：流化床金属沉积物的密度和组成受物理，化学和生物过程的影响。在本文中，我们调查了北爱尔兰一系列山地溪流中这些过程的重要性及其与藻类和非光合碎屑（NPD）生物量的关系。沉积物的密度以及铁，锰，铝和磷的浓度随地点的溪流pH值而变化，但不是季节性的。没有发现流床侵蚀或光还原对沉积物密度的影响。溪流水金属浓度的季节性变化与降雨相关。 NPD生物量是沉积物浓度的空间和季节变化的重要预测因子。 NPD生物量与沉积物金属浓度之间存在强的非线性关系，其中Fe和Mn变得相对更重要，藻类生物量下降到阈值沉积物/ NPD密度以上。结果表明，NPD生物量会影响沉积物密度，并使光合自养生物的生物量降低到阈值沉积物密度以上。

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