Burial of terrestrial and marine organic carbon in Jiaozhou Bay: different responses to urbanization |
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Authors: | Yang Liyang Wu Ying Zhang Jing Liu Sumei Deng Bing |
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Institution: | (1) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 200062 Shanghai, People’s Republic of China;(2) Present address: College of Oceanography and Environmental Science, Xiamen University, 361005 Xiamen, People’s Republic of China;(3) College of Chemistry and Chemical Engineering, Ocean University of China, 266100 Qingdao, People’s Republic of China; |
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Abstract: | Organic geochemical proxies (OC, OC/TN, δ13C, and lignin oxidation products) were measured in a 271 cm long sediment core collected from central Jiaozhou Bay, northern
China, to study the response of terrestrial and marine organic carbon burials to the surrounding urbanization. Terrestrial
organic carbon content was constantly low from the bottom of the core to ~150 cm depth, indicating a stable and low level
of terrestrial input before urbanization. Thereafter, it increased up to ~20 cm depth, suggesting that increased human activities
and land-use changes during urbanization likely enhanced the flux of terrestrial organic carbon to the bay. Overall, 5–38%
of the total organic carbon was terrigenous, which was derived from a mixture of woody and non-woody angiosperms and moderately
degraded. Marine organic carbon content did not increase notably during urbanization. It increased from the bottom of the
core to ~180 cm and stayed at high levels until it decreased in the top 20 cm. It was affected by multiple factors, including
grain size and nutrient composition. These results demonstrate the different influences of urbanization on terrestrial and
marine organic carbon cycles and suggest the importance of discriminating between these two organic carbon pools in the reconstruction
of their historical changes. |
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