Impacts of agricultural topdressing practices on cyanobacterial bloom phenology in an early eutrophic plateau Lake, China

Yang, Shangbo; Chen, Xiaoling; Lu, Jianzhong; Hou, Xiyan; Li, Wenkai; Xu, Qiangqiang

doi:10.1016/j.jhydrol.2020.125952

Cited by 22 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decomposition of harmful algal blooms can also release toxins and negatively impact microbial species diversity 91 . Acknowledging the predominant role of fertilizer-driven eutrophication in cyanobacterial dominance is essential for a comprehensive understanding of these blooms 92 . In our study, Planktothrix was the numerically dominant bacterial genus in the reservoir in the July and September 2019 samples, while Microcystis was the most abundant bacterial species detected in the November and January 2020 samples.…”

Section: Discussionmentioning

confidence: 99%

Temporal patterns of bacterial communities in the Billings Reservoir system

Marcondes,

Pessôa,

José da Silva Duarte

et al. 2024

Sci Rep

View full text Add to dashboard Cite

In this study, high-throughput sequencing of 16S rRNA amplicons and predictive PICRUSt functional profiles were used to perform a comprehensive analysis of the temporal bacterial distribution and metabolic functions of 19 bimonthly samples collected from July 2019 to January 2020 in the surface water of Billings Reservoir, São Paulo. The results revealed that most of the bacterial 16S rRNA gene sequences belonged to Cyanobacteria and Proteobacteria, which accounted for more than 58% of the total bacterial abundance. Species richness and evenness indices were highest in surface water from summer samples (January 2020), followed by winter (July 2019) and spring samples (September and November 2019). Results also showed that the highest concentrations of sulfate (SO4–2), phosphate (P), ammonia (NH3), and nitrate (NO3-) were detected in November 2019 and January 2020 compared with samples collected in July and September 2019 (P < 0.05). Principal component analysis suggests that physicochemical factors such as pH, DO, temperature, and NH3 are the most important environmental factors influencing spatial and temporal variations in the community structure of bacterioplankton. At the genus level, 18.3% and 9.9% of OTUs in the July and September 2019 samples, respectively, were assigned to Planktothrix, while 14.4% and 20% of OTUs in the November 2019 and January 2020 samples, respectively, were assigned to Microcystis. In addition, PICRUSt metabolic analysis revealed increasing enrichment of genes in surface water associated with multiple metabolic processes rather than a single regulatory mechanism. This is the first study to examine the temporal dynamics of bacterioplankton and its function in Billings Reservoir during the winter, spring, and summer seasons. The study provides comprehensive reference information on the effects of an artificial habitat on the bacterioplankton community that can be used to interpret the results of studies to evaluate and set appropriate treatment targets.

show abstract

Section: Discussionmentioning

confidence: 99%

Temporal patterns of bacterial communities in the Billings Reservoir system

Marcondes,

Pessôa,

José da Silva Duarte

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Human activities may have strong indirect effects on the temporal dynamics of PBs (Fang et al, 2022; Kakouei et al, 2021; Song et al, 2021). For example, catchment land use and agricultural topdressing practices have been shown to affect the phenology of lake PBs (Wynne et al, 2021; Yang, Chen, et al, 2021). Increased water temperatures due to urbanization may also be relevant.…”

Section: Discussionmentioning

confidence: 99%

Urbanization shifts long‐term phenology and severity of phytoplankton blooms in an urban lake through different pathways

Tao

Zhang

et al. 2023

Global Change Biology

View full text Add to dashboard Cite

Climate change can induce phytoplankton blooms (PBs) in eutrophic lakes worldwide, and these blooms severely threaten lake ecosystems and human health. However, it is unclear how urbanization and its interaction with climate impact PBs, which has implications for the management of lakes. Here, we used multi-source remote sensing data and integrated the Virtual-Baseline Floating macroAlgae Height (VB-FAH) index and OTSU threshold automatic segmentation algorithm to extract the area of PBs in Lake Dianchi, China, which has been subjected to frequent PBs and rapid urbanization in its vicinity. We further explored long-term trends in the phenological and severity metrics of PBs and quantified the contributions from urbanization, climate change, and also nutrient levels to these trends. When comparing data from 2011-2021 to 2000-2010, we found significantly advanced initiation of PBs (28.6 days) and noticeably longer duration (51.9 days) but an insignificant trend in time of disappearance. The enhancement of algal nutrient use efficiency, likely induced by increased water temperature and reduced nutrient concentrations, presumably contributed to an earlier initiation and longer duration of PBs, while there was a negative correlation between spring wind speed and the initiation of PBs. Fortunately, we found that both the area of the PBs and the frequency of severe blooms (covering more than 19.8 km 2 ) demonstrated downward trends, which could be attributed to increased wind speed and/or reduced nutrient levels. Moreover, the enhanced land surface temperature

show abstract

“…During the rice growing season, runoff water is generated when the volume of rainfall combined with the field ponding water exceed the capacity of field berms to enclose water [68]. The duration between applications of different fertilizer sources and a runoff event can affect the concentrations of nutrients in runoff [69,70]. A portion of the N from watersheds entering river networks, particularly after applying fertilizers, is nutrients that are easily lost to channels.…”

Section: Critical Period Of Nitrogen Deposition and Runoffmentioning

confidence: 99%

Nitrogen Transport/Deposition from Paddy Ecosystem and Potential Pollution Risk Period in Southwest China

Guo

Yan

Zhai

et al. 2022

Water

View full text Add to dashboard Cite

Nitrogen (N) losses through runoff from cropland and atmospheric deposition contributed by agricultural NH3 volatilization are important contributors to lake eutrophication and receive wide attention. Studies on the N runoff and atmospheric N deposition from the paddy ecosystem and how the agriculture-derived N deposition was related to NH3 volatilization were conducted in the paddy ecosystem in the Erhai Lake Watershed in southwest China. The critical period (CP) with a relatively high total N (TN) and NH4+-N deposition occurred in the fertilization period and continued one week after the completion of fertilizer application, and the CP period for N loss through surface runoff was one week longer than that for deposition. Especially, the mean depositions of NH4+-N in the CP period were substantially higher than those in the subsequent period (p < 0.01). Moreover, agriculture-derived NH4+ contributed more than 54% of the total NH4+-N deposition in the CP period, being positively related to NH3 volatilization from cropland soil (p < 0.05). The N concentrations were higher in the outlet water of ditches and runoff in May than in other months due to fertilization and irrigation. Therefore, to reduce the agricultural N losses and improve lake water quality, it is important to both reduce agricultural NH4+-N deposition from NH3 volatilization and intercept water flow from the paddy fields into drainage ditches during the CP.

show abstract

Impacts of agricultural topdressing practices on cyanobacterial bloom phenology in an early eutrophic plateau Lake, China

Cited by 22 publications

References 40 publications

Temporal patterns of bacterial communities in the Billings Reservoir system

Temporal patterns of bacterial communities in the Billings Reservoir system

Urbanization shifts long‐term phenology and severity of phytoplankton blooms in an urban lake through different pathways

Nitrogen Transport/Deposition from Paddy Ecosystem and Potential Pollution Risk Period in Southwest China

Contact Info

Product

Resources

About