Journal
ECOLOGICAL INDICATORS
Volume 134, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ecolind.2021.108469
Keywords
Chaihe Reservoir; Sediment; Eutrophication; Radionuclide 210 Pb and 137 Cs; Stable carbon isotope
Categories
Funding
- National Natural Science Foundation of China [41703099]
- Natural Science Foundation of Shandong Province, China [ZR2020MD108]
- Major Research Plan of the Shandong Natural Science Foundation [ZR2020ZD19]
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The study revealed that eutrophication in Chaihe Reservoir in Kunming, China has worsened, with human activities contributing to increased input of organic carbon, nitrogen, and sulfur into the aquatic environment.
In order to reveal eutrophication evolution, radionuclides (210Pb and 137Cs), total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), total sulphur (TS) concentrations, stable carbon isotope (delta 13C) were analyzed in a sediment core collected from Chaihe Reservoir in Kunming, Yunnan province, southwest China during 2019. The results showed that the 210Pbex activities ranged from 9.67 to 130.72 Bq/Kg (average 61.84 Bq/ Kg), and the age sequence ranged from 1885 to 2018. The sediment accumulation rates were in the range of 0.04-1.85 cm/yr, with an average of 0.56 cm/yr and exogenous inputs have been increasing. Based on the nutrients (C, N, P, and S), the aquatic environment in the reservoir experienced a shift from near-natural status to human interference status. In particular, human activities has increased the input of C, N, and S into the aquatic environment in the recent years. Elemental ratios reflected that aquatic environment in the reservoir was obviously restricted by N. Additionally, oxygen concentration decreased in the sediment, corresponding to the aggravated eutrophication in the reservoir. The algae, CAM plants, and bunchless fibrous plants inputs primarily accounted for the sources of organic matter in the sediment. Ecological risk assessment showed that eutrophic ecological risk caused N in the sediment has continuously increased, whereas eutrophic ecological risk caused P has been decreased in recent years. These findings implied that eutrophication in the reservoir has been aggravated.
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