Nutrient amendment effects on phytoplankton, water chemistry, and cyanotoxins in the 2018 Large-Scale Mesocosm Experiment at the University of Kansas Field Station

This dataset includes water physicochemical parameters, phytoplankton community composition, and cyanobacteria metabolites collected during a 21-day nutrient amendment experiment conducted from 23 July to 13 August 2018 at the University of Kansas Biological Station, Lawrence, KS, United States (39.049674°N, 95.190777°W). The experiment was performed using 18 large-scale, closed-bottom fiberglass tanks (volume: 11,000 L; height: 1.25 m; diameter: 3 m). Three tanks served as ambient controls (CON), while the others received one of the following nutrient treatments: nitrogen only (280 µM) as either ammonium chloride (NH4) or sodium nitrate (NO3); nitrogen (280 µM) plus phosphorus (200 µM) as either ammonium chloride + dipotassium phosphate (NHP) or sodium nitrate + dipotassium phosphate (NOP); and phosphorus only (200 µM) as dipotassium phosphate (P). Each tank received an initial nutrient dose on Day 0.5, followed by weekly additions of 20% of the initial amendment to maintain treatment conditions. All data were quality controlled to correct basic errors and to remove measurements outside the manufacturer’s standard operational ranges.

本数据集涵盖2018年7月23日至8月13日于美国堪萨斯州劳伦斯市堪萨斯大学生物站（39.049674°N, 95.190777°W）开展的为期21天营养盐添加实验中采集的水体理化参数、浮游植物群落组成与蓝藻代谢产物。本实验采用18个大型封闭底部玻璃钢水箱（容积：11000 L；高度：1.25 m；直径：3 m），其中3个作为环境对照（CON），其余水箱分别接受以下营养盐处理方案：仅添加氮（280 μM），形式为氯化铵（NH4）或硝酸钠（NO3）；氮（280 μM）与磷（200 μM）联合添加，形式为氯化铵+磷酸氢二钾（NHP）或硝酸钠+磷酸氢二钾（NOP）；以及仅添加磷（200 μM），形式为磷酸氢二钾（P）。所有水箱均于实验第0.5天施加初始营养盐剂量，随后每周添加初始添加量的20%以维持处理条件。所有数据均经过质量控制，用于修正基础错误并剔除超出厂商标准操作范围的测量值。