| DAI Jicui,SONG Jinming,LI Xuegang,YUAN Huamao,ZHENG Guoxia,LI Ning. 2007. Geochemical records of phosphorus in Jiaozhou Bay sediments-Implications for environmental changes in recent hundred years. Acta Oceanologica Sinica, (4):132－147 |
| Geochemical records of phosphorus in Jiaozhou Bay sediments-Implications for environmental changes in recent hundred years |
| Geochemical records of phosphorus in Jiaozhou Bay sediments-Implications for environmental changes in recent hundred years |
| Received:May 20, 2006 Revised:March 22, 2007 |
| DOI： |
| Key words:phosphorus forms geochemical characteristics anthropogenic activity environmental significance Jiaozhou Bay sediments |
| 中文关键词: phosphorus forms geochemical characteristics anthropogenic activity environmental significance Jiaozhou Bay sediments |
| 基金项目: |
| Author Name | Affiliation | E-mail | | DAI Jicui | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Graduate School, Chinese Academy of Sciences, Beijing 100039, China | | | SONG Jinming | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | mjsong@ms.qdio.ac.cn | | LI Xuegang | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | YUAN Huamao | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | ZHENG Guoxia | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Graduate School, Chinese Academy of Sciences, Beijing 100039, China | | | LI Ning | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | |
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| Abstract: |
| Phosphorus is a key element and plays an important role in global biogeochemical cycles. The evolution of sedimentary environment is also influenced by phosphorus concentrations and fractions as well as phosphate sorption characteristics of the marine sediments. The geochemical characteristics of phosphorus and their environmental records were presented in Jiaozhou Bay sediments. Profiles of different forms of phosphorus were measured as well as the roles and vertical distributions of phosphorus forms in response to sedimentary environment changes were investigated. The results showed that inorganic phosphorus (IP) was the major fraction of total phosphorus (TP); phosphorus which is bound to calcium, iron and occluded phosphorus, as well as the exchangeable phosphorus were the main forms of IP, especially calcium-phosphorus, including detrital carbonate-bound phosphorus (Det-P) and authigenic apatite-bound phosphorus (ACa-P), are the uppermost constituent of IP in Jiaozhou Bay sediments. Moreover, the lead-210 chronology technology was employed to estimate how much phosphorus was buried ultimately in sediments. And the research showed that the impacts of human activities have increased remarkably in recent years especially between the 1980s and 2000. According to research, the development of Jiaozhou Bay environment in the past hundred years can be divided into three stages:(1) before the 1980s characterized by the relatively low sedimentation rate, weak land-derived phosphorus inputs and low anthropogenic impacts; (2) from the 1980s to around 2000, accelerating in the 1990s, during which high sedimentation rates, high phosphorus abundance and burial fluxes due to the severe human activities impacted on the whole environmental system; (3) after 2000, the period of the improvement of environment, the whole system has been improved including the decreasing sedimentation rates, concentration and the burial fluxes of phosphorus. |
| 中文摘要: |
| Phosphorus is a key element and plays an important role in global biogeochemical cycles. The evolution of sedimentary environment is also influenced by phosphorus concentrations and fractions as well as phosphate sorption characteristics of the marine sediments. The geochemical characteristics of phosphorus and their environmental records were presented in Jiaozhou Bay sediments. Profiles of different forms of phosphorus were measured as well as the roles and vertical distributions of phosphorus forms in response to sedimentary environment changes were investigated. The results showed that inorganic phosphorus (IP) was the major fraction of total phosphorus (TP); phosphorus which is bound to calcium, iron and occluded phosphorus, as well as the exchangeable phosphorus were the main forms of IP, especially calcium-phosphorus, including detrital carbonate-bound phosphorus (Det-P) and authigenic apatite-bound phosphorus (ACa-P), are the uppermost constituent of IP in Jiaozhou Bay sediments. Moreover, the lead-210 chronology technology was employed to estimate how much phosphorus was buried ultimately in sediments. And the research showed that the impacts of human activities have increased remarkably in recent years especially between the 1980s and 2000. According to research, the development of Jiaozhou Bay environment in the past hundred years can be divided into three stages:(1) before the 1980s characterized by the relatively low sedimentation rate, weak land-derived phosphorus inputs and low anthropogenic impacts; (2) from the 1980s to around 2000, accelerating in the 1990s, during which high sedimentation rates, high phosphorus abundance and burial fluxes due to the severe human activities impacted on the whole environmental system; (3) after 2000, the period of the improvement of environment, the whole system has been improved including the decreasing sedimentation rates, concentration and the burial fluxes of phosphorus. |
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