Bacterial Abundance and Physicochemical Characteristics of Water and Sediment Associated with Hydroelectric Dam on the Lancang River China
Bacterial Abundance and Physicochemical Characteristics of Water and Sediment Associated with Hydroelectric Dam on the Lancang River China
复制标题
中国澜沧江水电站大坝相关水体和沉积物的细菌丰度及理化特征
DOI：
10.3390/ijerph16112031
复制
发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
傅开道
中科院分区：
文献类型：
--
作者：
傅开道
尽管它们在生物地球化学过程、底栖生态学和生物修复中具有重要意义，但对水坝河流水柱和沉积物中细菌丰度的研究仍然知之甚少。本研究利用荧光显微镜对澜沧江中游水库（坝址上）和下游河段（坝址下）在丰水期、平水期和枯水期的水底泥细菌进行了研究。结果表明：水库运行机制（水量变化）和强降水导致坝下河流条件的显著差异，特别是溶解氧浓度、氧化还原电位、电导率、浊度、水中总溶解固形物浓度和沉积物中微生物活性浓度。季节变化也是影响坝下采样点水质的关键因素。当无机营养物充足时，营养物浓度对细菌丰度没有显著影响。沉积物中的细菌密度受水电相关排放、颗粒大小和沉积物类型的调节，而水中细菌丰度与水的物理化学特征（如总溶解固体和电导率）密切相关。
Research on bacterial abundance in water column and sediment of dammed rivers remain poorly understood, despite their importance to biogeochemical processes, benthic ecology, and bioremediation. The present study investigates the water and sediment bacteria by epifluorescence microscopy in the reservoir (above the dam site), as well as in the downstream river stretches (below-dam site) at the middle reach of Lancang River during the wet, the normal and the dry seasons. The results demonstrated that the reservoir operating regime (water discharge variations) and strong precipitation promoted significant differences in the conditions of the river below the dam, especially for the concentration of dissolved oxygen, redox potential, electric conductivity, turbidity, and total dissolved solids in water and concentration of microbial activity in sediment. The seasonal variations were also key factors influencing water quality at the below-dam sampling sites. Nutrients concentration did not induce a significant response in bacterial abundance when inorganic nutrients were sufficient. Bacterial density in sediment was regulated by hydropower-related discharge, particle size, and type of sediments, while bacterial abundances in water were strongly linked with the physicochemical characteristics of the water, such as total dissolved solids and conductivity.
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影响因子：
4.4
作者：
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通讯作者：
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影响因子：
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通讯作者：
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