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| Characteristics and sources of organic matter in surface sediments of Dahekou Reservoir,China |
| Received:May 13, 2019 |
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| KeyWord:Dahekou Reservoir;organic matter;carbon isotope(δ13C);nitrogen isotope (δ15N);sources |
| Author Name | Affiliation | E-mail | | ZHANG Xiao-jing | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | LU Jun-ping | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | ljpcau@163.com | | ZHANG Sheng-wei | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | MA Tai-ling | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | ZHANG Zi-hao | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | |
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| Abstract: |
| To further analyze the pollution source of reservoir ecosystem and nutritional status of water environment, the total organic carbon (TOC)distribution characteristics, total nitrogen(TN), and composition of carbon isotope(δ13C), nitrogen isotope(δ15N)and C/N value were analyzed in this paper. In addition, the source of sediment organic matter was determined. The results showed that the surface sediments of Dahekou Reservoir were mainly aeolian sediments transported from distant sources. TOC ranged from 1.38% to 3.52%, with an average of 2.34%. TN ranged from 0.06% to 0.21%, with an average of 0.11%. The δ13C values ranged from -2.69% to -2.41%, and the average was -2.54%. The δ15N ranged from 0.19% to 0.54%, and the average was 0.39%. According to the qualitative and semi-quantitative analysis of the sources of sediment organic matter by end element hybrid model, the terrestrial C3 plants, soil organic matter, and freshwater aquatic plants were the main sources of organic matter in sediment of Dahekou Reservoir. Among them, the contribution of terrestrial C3 plants was the most, followed by soil organic matter, and only one section had the source of freshwater aquatic plants. The primary productivity of Dahekou Reservoir is not high, the source composition of organic matter has little difference, and the source of organic matter is mostly exogenous. |
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