Abstract Miranda LE, Raines CD. 2019. Reservoir diel water quality patterns relative to riparian shade. Lake Reserv Manage. 35:148–155. Investigations into the effects of riparian shade on water quality have focused on streams, with less emphasis on natural lakes, and almost no attention given to reservoirs. In view of this gap, our objective was to assess diel water quality patterns in the nearshore zone of a reservoir and test whether diel patterns differed relative to the presence or absence of riparian shade. Light intensity, temperature, dissolved oxygen, pH, and oxidation–reduction potential were higher in unshaded sites (P < 0.05), whereas phosphate levels were higher in shaded sites. Levels of nitrate, turbidity, and specific conductance were similar in shaded and unshaded sites. Most variables exhibited distinct diel cycles. Light intensity in shaded and unshaded sites peaked simultaneously near mid-day; most other variables peaked several hours later in the afternoon and evening, but 1–2 h earlier in shaded sites. Unlike in streams, in most large lacustrine ecosystems the nearshore shaded band is small relative to the unshaded open water, and consequently is not expected to have an extensive influence on whole-lake water quality. Nevertheless, because of the diversity of microhabitats available in nearshore areas, including those created by the effects of shade on water quality, the nearshore zone plays a disproportionate role in maintaining integrity of a lake or reservoir ecosystem. Existing guidelines inform shade management in lakes and reservoirs only indirectly and in generalities; additional research is needed to develop best management practices that address shade more comprehensively.

中文翻译：

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相对于河岸阴影的水库 Diel 水质模式

摘要 Miranda LE，Raines CD。2019. Reservoir diel 水质模式相对于河岸树荫。湖泊保护区管理。35:148-155。对河岸遮荫对水质影响的调查主要集中在溪流上，较少关注天然湖泊，几乎没有关注水库。鉴于这一差距，我们的目标是评估水库近岸区域的日间水质模式，并测试日间模式是否因河岸遮荫的存在或不存在而不同。光照强度、温度、溶解氧、pH 值和氧化还原电位在未阴影处较高（P < 0.05），而磷酸盐水平在阴影处较高。硝酸盐、浊度和比电导水平在阴影和未阴影的位置相似。大多数变量表现出不同的干燥周期。阴凉处和无阴凉处的光照强度在接近中午时同时达到峰值；大多数其他变量在下午和晚上几个小时后达到峰值，但在阴凉处提前 1-2 小时。与溪流不同，在大多数大型湖泊生态系统中，近岸阴影带相对于未遮蔽的开阔水域而言较小，因此预计不会对全湖水质产生广泛影响。然而，由于近岸地区可用的微生境的多样性，包括由遮荫对水质影响而产生的微生境，近岸区域在维持湖泊或水库生态系统的完整性方面发挥着不成比例的作用。现有的指导方针只是间接和概括地告知湖泊和水库的遮荫管理；