[Analysis of Total Organic Carbon Source Differences Between New and Old Cascade Reservoirs using Carbon and Nitrogen Isotopes]

Cong-Feng Wang; Zi-Long Hu; Zheng-Jian Yang; Yong Dan; Ping Zhao; Wen-Chao Hao; Xiao-Fen Nie; Rui Nie; Liu-de Xu; De-Fu Liu

doi:10.13227/j.hjkx.201811243

[Analysis of Total Organic Carbon Source Differences Between New and Old Cascade Reservoirs using Carbon and Nitrogen Isotopes]

Huan Jing Ke Xue. 2019 Jul 8;40(7):3039-3048. doi: 10.13227/j.hjkx.201811243.

[Article in Chinese]

Authors

Cong-Feng Wang^{1

2}, Zi-Long Hu¹, Zheng-Jian Yang¹, Yong Dan¹, Ping Zhao¹, Wen-Chao Hao¹, Xiao-Fen Nie¹, Rui Nie¹, Liu-de Xu¹, De-Fu Liu^{1

3}

Affiliations

¹ College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China.
² Engineering Research Center of Eco-environment in Three Gorges Reservoir Area Region, Yichang 443002, China.
³ Hubei Key Laboratory of Ecological Restoration of River-lakes and Algal Utilization, College of Civil Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.

PMID: 31854701
DOI: 10.13227/j.hjkx.201811243

Abstract

The ecological problems due to reservoir construction are causing unprecedented concern. To reveal the differences in organic carbon distribution characteristics and sediment sources of total organic carbon (TOC) between the old and new reservoirs, water samples, and sediment samples from reservoirs constructed in the three different periods of Miaowei, Gongguoqiao, and Dachaoshan were collected in November 2017. The temperature (T), dissolved oxygen (DO), TOC, redox potential (ORP), total nitrogen (TN), and total phosphorus (TP) of the water samples were measured. The isotopes ¹⁵N and ¹³C were used as indicators with IsoSource software to analyze the contributions of TOC sources and their source materials to the corresponding reservoir sediments, in order to explore the carbon cycle mechanism and evolution mode of reservoir. The results showed that the average concentrations of organic carbon in the waters of the Miaowei, Gongguoqiao, and Dachaoshan Reservoirs were 0.95 mg·L^-1, 1.97 mg·L^-1, and 4.64 mg·L^-1, respectively. The range of organic carbon content in the corresponding sediments was 4.41-81.63 g·kg^-1, 18.30-28.42 g·kg^-1, and 9.16-14.46 g·kg^-1, respectively. The cascade construction of the reservoirs resulted in a difference between the sediment sources of the new and old reservoirs and the surrounding recharge area, meaning that the TOC of the new and old reservoirs were significantly different. For the TOC of waterbodies, the difference between the thermodynamic state of water and dissolved oxygen indirectly affects the distribution trend of TOC. The sediments mainly reflect the influence of source elements, that is, the ability of the sedimentary environment to preserve organic matter was the main cause of the vertical distribution of DCS, MV, and GGQ sediments. In the evolution mode of cascade reservoir, the research shows that it can be preliminarily set as three stages. Firstly, due to the short age of MV, it is in the first stage and mainly accumulates the TOC from the upstream. GGQ is longer than the age of MV, and it is mainly used to decompose the upstream TOC, so it is defined as in the second stage. Finally, as an old reservoir, DCS mainly accumulates TOC sources around the reservoir, which can be regarded as the third stage.

Keywords: carbon and nitrogen isotopes; difference analysis; new and old reservoir; organic carbon; sediment.

Publication types

English Abstract