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Assessing phosphorus distribution and bioavailability in Lake Decatur, IL
Lake and Reservoir Management ( IF 1.5 ) Pub Date : 2020-05-06 , DOI: 10.1080/10402381.2020.1744775
Marcel L. Dijkstra 1 , Miles J. Corcoran 2 , John J. Sloan 2 , Brittany L. Lutz 1
Affiliation  

Abstract Dijkstra ML, Corcoran MJ, Sloan JJ, and Lutz BL. 2020. Assessing phosphorus distribution and bioavailability in Lake Decatur, IL. Lake Reserv Manage. 36:376–390. In freshwater systems phosphorus is generally considered to be the limiting nutrient for algal growth, but not all phosphorus species are equally bioavailable to algae. Furthermore, the ratio of bioavailable to nonavailable phosphorus, impacted by in-lake processes and tributary loadings, is known to vary. Limited information, however, is available regarding this variation. Here we present the results from our investigation into spatial patterns in phosphorus concentration and bioavailability for 12 sites on Lake Decatur, a eutrophic 6-basin reservoir in central Illinois. We found that soluble phosphorus was distributed fairly homogeneously among basins, but the particulate fraction varied significantly (representing ∼11% and ∼89%, of phosphorus present in the system, respectively). Bioavailable phosphorus was also not evenly distributed throughout the reservoir. The highest concentration of bioavailable phosphorus (0.063 mg/L) was found in a basin that receives return flow of supernatant water from the dredged sediments dewatering pond. The reservoir’s outflow basin, which has more tributaries and coastline than the other 5 basins, had a similar concentration (0.061 mg/L). Bioavailable phosphorus concentrations in the other basins had a mean of 0.024 mg/L, making these less susceptible to algal blooms and subsequent water quality degradation. Current monitoring and reduction efforts regarding nitrogen (to remediate blooms in the Gulf of Mexico) need to (more fully) include phosphorus. Site-specific kinetics, presented in this work, will support model (re)development to improve the selection and prioritization of effective strategies to remove/control the limiting nutrient in Lake Decatur.

中文翻译:

评估伊利诺伊州迪凯特湖的磷分布和生物利用度

摘要 Dijkstra ML、Corcoran MJ、Sloan JJ 和 Lutz BL。2020. 评估伊利诺伊州迪凯特湖的磷分布和生物利用度。湖泊保护区管理。36:376-390。在淡水系统中,磷通常被认为是藻类生长的限制性营养物质,但并非所有磷物种对藻类的生物利用度都相同。此外,已知受湖内过程和支流负荷影响的生物可利用磷与不可利用磷的比率会发生变化。但是,关于这种变化的信息有限。在这里,我们展示了我们对迪凯特湖(位于伊利诺伊州中部的富营养化 6 盆地水库)上 12 个地点的磷浓度和生物利用度空间模式的调查结果。我们发现可溶性磷在盆地之间分布相当均匀,但颗粒部分变化很大(分别代表系统中磷的 11% 和 89%)。生物可利用的磷也没有均匀地分布在整个水库中。在接收来自疏浚沉积物脱水池的上清水回流的盆地中发现了最高浓度的生物可利用磷 (0.063 mg/L)。与其他 5 个流域相比,水库出流流域的支流和海岸线更多,浓度相似(0.061 毫克/升)。其他盆地的生物可利用磷浓度平均为 0.024 毫克/升,使这些盆地不易受到藻华和随后的水质退化的影响。目前关于氮的监测和减少工作(以修复墨西哥湾的水华)需要(更充分地)包括磷。
更新日期:2020-05-06
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