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| Spatial distribution characteristics of the organic carbon insediments of Nanhai Lake in Baotou City |
| Received:August 01, 2017 |
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| KeyWord:Nanhai wetlands;sediments;organic carbon;spatial distribution |
| Author Name | Affiliation | E-mail | | YU Ling-hong | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | | | WANG Ming-hao | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | | | LI Wei-ping | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | sjlwp@163.com | | YANG Wen-huan | School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China | | | FAN Ai-ping | Baotou City Ecological Wetland Protection and Management Center, Baotou 014010, China | | | MIAO Chun-lin | Baotou Nanhaizi Wetland Reserve Management Office, Baotou 014040, China | |
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| Abstract: |
| As one of the important carbon pools in the ecosystem, lake organic carbon pools are major carbon reserves for atmospheric CO2. Their stability is of great significance to the entire ecosystem. This essay considered the organic carbon of Nanhai Lake sediments as the research object, analyzing its spatial distribution characteristics and stability, based on the ratio of active organic carbon to total organic carbon. The results showed that the organic carbon content decreased vertically along with the increase in sediment depth, while the total organic carbon varied between 3.96 and 28.35 g·kg-1, with an average of 13.11 g·kg-1. The active organic carbon ranged from 1.16 to 16.47 g·kg-1, with an average of 6.12 g·kg-1. Thus, the active organic carbon ranged from 34.19 to 54.64 percent of the total organic carbon. Its coefficient of variation, between 10 and 100 percent, appeared moderately variable. The organic carbon content varied between 8.91 and 28.35 g·kg-1, with an average of 16.52 g·kg-1, peaking at a depth of 0 to 10 cm. Meanwhile, the active organic carbon occupied a large proportion of the total. As a result, its susceptibility to interference contributed to the poor stability of the carbon pool. However, due to the inertness of the organic carbon in general, the entire carbon pool seemed stable. The results also demonstrated that the organic carbon content decreased horizontally along the radius of the lake, with the maximum being at the center of the lake, along with a high content in the influent and ditch reed areas. The higher the total organic carbon, the higher the active organic carbon. The active organic carbon accounted for 44.16 percent of the total on the central island, with 43.47 percent at the lake center. The total organic carbon reached the maximum in ditch reed areas, where a significantly lower content of active organic carbon, at 39.78 percent, was detected. In the same way, the inert organic carbon occupied a large proportion, with the carbon pool appearing stable. To sum up, the stability of the sediment carbon pools can be affected by ditch reed areas and human activities, with an increase in the sediment depth corresponding to an increase in their stability. |
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