Abstract Jones JR, Thorpe AP, Obrecht DV. 2020. Limnological characteristics of Missouri reservoirs: synthesis of a long-term assessment. Lake Reserv Manage. 36:412–422. Missouri reservoirs reflect their edaphic location in the midcontinent ecotone between historic prairies and forests. Most are small (median surface area of 28 ha) but provide essential services in a region with few natural lakes. Long-term summer monitoring data (1978–2016) show that they span the full trophic state range, with oligotrophic reservoirs in deep, forested valleys and eutrophic–hypereutrophic impoundments in agricultural regions. In regression analysis, row crop (a surrogate for agricultural nutrient loss) along with depth and flushing rate accounted for some two-thirds of variation among reservoir nutrients. Hydrology is a strong influence; total phosphorus (TP) effectively doubles between flushing rates of 0.25/yr and 2/yr when holding land cover and depth constant. Temporal variation characterizes these impoundments; many show >3-fold range in mean summer trophic state metrics, which is influenced by the volume and timing of annual inflow. This variation may mask gradual nutrient-driven changes in trophic state; based on simulation, doubling chlorophyll (Chl) in a given lake over 20 yr could be undetectable with routine summer monitoring. Some two-thirds of cross-system variation in mean Chl was explained by TP, and inorganic solids further reduced variation (negative coefficient). On average, Chl:TP ratios increased from 0.28 to 0.48 during summer, coincident with a decline in inorganic solids. Inorganic particulates largely determine Secchi transparency and can result in light limitation of phytoplankton. Small reservoirs cover nearly double the area of major impoundments worldwide and are known for an intensity of ecological processes, making this information relevant beyond the region.

中文翻译：

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密苏里州水库的湖沼学特征：综合长期评估

摘要 Jones JR、Thorpe AP、Obrecht DV。2020. 密苏里州水库的湖沼学特征：长期评估综合。湖泊保护区管理。36:412–422。密苏里州的水库反映了它们在历史悠久的草原和森林之间的大陆中部交错带中的土壤位置。大多数规模较小（平均表面积为 28 公顷），但在天然湖泊很少的地区提供基本服务。长期夏季监测数据（1978-2016 年）表明，它们跨越了整个营养状态范围，在深谷、森林覆盖的山谷中存在贫营养水库，在农业区存在富营养化-超富营养化蓄水池。在回归分析中，行作物（农业养分损失的替代品）以及深度和冲刷率占水库养分变化的三分之二左右。水文是一个强大的影响；当保持土地覆盖和深度恒定时，总磷 (TP) 在 0.25/年和 2/年的冲洗速率之间有效地加倍。时间变化是这些蓄水池的特征；许多在夏季平均营养状态指标中显示 > 3 倍的范围，这受到年度流入量和时间的影响。这种变化可能掩盖了营养状态逐渐由营养驱动的变化；根据模拟，通过常规夏季监测，可能无法检测到给定湖泊中超过 20 年的叶绿素 (Chl) 翻倍。TP 解释了平均 Chl 中大约三分之二的跨系统变化，无机固体进一步减少了变化（负系数）。平均而言，夏季期间 Chl:TP 比率从 0.28 增加到 0.48，与无机固体的下降同时发生。无机颗粒在很大程度上决定了 Secchi 透明度，并可能导致浮游植物的光照限制。小型水库覆盖的面积几乎是全球主要蓄水池面积的两倍，并且以生态过程的强度而闻名，这使得这些信息在该地区之外具有相关性。