1. Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China;
2. School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China;
3. Key Laboratory of Urbanization and Geographical Environment Simulation of Guangdong Province, Guangzhou 510275, China
To investigate the impacts of urbanization processes, water conservancy project and human activities on the evolution trend of river water environment, sediment core (CH1) was collected in the Changhu Reservoir, Wengjiang River basin, in September 2015. Measurements of sediment unsupported 210Pb (210Pbex) activity, TOC, TN, TP content, δ13C and particle size were conducted. The results showed that the sedimentary record of CH1 was obtained in about 58years. The average contents of TOC, TN and TP in the sediment core were 1.07% (range:0.65%~1.66%), 0.12% (0.08%~0.20%), 438.00mg/kg (294.74~675.44mg/kg). Vertical distribution characteristics of TOC, TN and TP in the sediment core of the reservoir showed that before 1957, the TN, TP and TOC content of sediment core exhibited a slowly increasing trend, the content initially increased and then decreased in 1957 to 1991, and generally increased from 1991 to 2015. However, the storm flood occurred in 1994 significantly changed the sediment particle composition, thus decreasing TOC, TN and TP content. In combination with characteristics of C/N and δ13C, the source of organic matter was mainly identified as the mixture of terrestrial and aquatic sources, and the dam construction mainly resulted in the input of terrigenous organic matter in the reservoir area.
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