Sediment records and responses for anthropogenic activities of organic matter in the Daya Bay during recent one hundred years

Qu Baoxiao; Song Jinming; Yuan Huamao

doi:10.3969/j.issn.0253-4193.2018.10.012

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Qu Baoxiao, Song Jinming, Yuan Huamao. Sediment records and responses for anthropogenic activities of organic matter in the Daya Bay during recent one hundred years[J]. Haiyang Xuebao, 2018, 40(10): 119-130. doi: 10.3969/j.issn.0253-4193.2018.10.012

Citation:

Qu Baoxiao, Song Jinming, Yuan Huamao. Sediment records and responses for anthropogenic activities of organic matter in the Daya Bay during recent one hundred years[J]. Haiyang Xuebao, 2018, 40(10): 119-130. doi: 10.3969/j.issn.0253-4193.2018.10.012

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Sediment records and responses for anthropogenic activities of organic matter in the Daya Bay during recent one hundred years

doi: 10.3969/j.issn.0253-4193.2018.10.012

Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;University of Chinese Academy of Sciences, Beijing 100049, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2018-04-30
Rev Recd Date: 2018-06-25

Abstract

Abstract

The grain size of sediments, total organic carbon (TOC), total nitrogen (TN), ratio of TOC/TN, and abundance of stable isotope (δ¹³C, δ¹⁵N) were analyzed in sediments of the Daya Bay. Combining with the sedimentary chronology information and end-member model, the sediment records and responses for anthropogenic activities of organic matter in the Daya Bay during recent one hundred years were discussed. The results showed that the sediment characteristics of the Daya Bay changed significantly from late 1970s to early 1980s. Before that time, TOC, TN, δ¹³C and δ¹⁵N were stable, and the ratio of terrestrial and marine organic carbon was maintained at 3:7. After then, however, the content of TOC and TN has been significantly increased, and TOC/TN has continued to decline. From 1980 to 2000 and from 2010 to date, there has been increases of terrestrial organic carbon and decreases of marine organic carbon. The aforementioned variations of sediment characteristics in the Daya Bay indicated the marine environment has undergone significant changes since late 1970s to early 1980. During the recent 20 years, the GDP had significant positive correlations with TN and δ¹⁵N, and had significant negative correlation with the TOC/TN. These finding proved the rapid developments of economy, aquaculture, and population around the Daya Bay were the controlling factors for the ecological environment change. Future research should pay close attention to the influence of human activities on the ecological environment of coastal bays, and reasonably establish laws and regulations to protect and repair the ecological environment of them.
- stable isotope of carbon and nitrogen,
- organic matter,
- anthropogenic activities,
- environmental changes,
- sediment,
- Daya Bay

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References(23)

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