| Water, organic matter, nitrogen and phosphorus contents in sediment of a large-scale mariculture area in the Zhelin Bay of eastern Guangdong Province, China |
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| 作者姓名： | DONG Qiaoxiang LIN Jun SHANG Xu LI Jin HUANG Changjiang |
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| 作者单位： | DONG Qiaoxiang（School of Environmental Science and Public Health,Wenzhou Medical College,Wenzhou 325035,China） ;
LIN Junda（School of Environmental Science and Public Health,Wenzhou Medical College,Wenzhou 325035,China;Florida Institute of Technology,Melbourne,Florida 32901-6975,USA） ;
SHANG Xu（School of Environmental Science and Public Health,Wenzhou Medical College,Wenzhou 325035,China） ;
LI Jin（School of Environmental Science and Public Health,Wenzhou Medical College,Wenzhou 325035,China） ;
HUANG Changjiang（School of Environmental Science and Public Health,Wenzhou Medical College,Wenzhou 325035,China） ; |
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| 基金项目： | The Major Projects of Wenzhco Medical College under contract No.XNK06008 and the Major Marine Technology Projects of Guangdong Province under contract No.A20000SF02. |
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| 摘 要： | The Zhelin Bay is one of the most important bays for large-scale mariculture in Guangdong Province, China. Owing to the increasing human population and the expanding mariculture in the last two decades, the ecological environment has greatly changed with frequent harmful algal blooms. A monthly survey of water content, organic matter （TOM）, and various forms of nitrogen and phosphorous in sediment from July 2002 to July 2003 in the bay was conducted. The results showed that the water content was correlated significantly with TOM and various forms of nitrogen and phosphorus and can be used as proxy for quick and rough estimate of these factors in the future surveys. TOM was also correlated significantly with various forms of nitrogen and phosphorus, indicating that it was one of the key factors affecting the concentrations and distributions of nitrogen and phosphorus in the investigated waters. Average total Kjeldhal nitrogen （TkN） content was（ 1 113.1 ± 382.5）μg/g and average total phosphorus （TP） content was（567.2± 223.3）μg/g, and both were much higher than those of similar estuaries in China and elsewhere. Average nitrogen and phosphorus tended to be higher inside than outside the bay, higher at aquaculture than non-aquaculture areas, and higher at fish-cage culture than oyster culture areas, suggesting that large-scale mariculture inside the bay played an important role in the eutrophication of the Zhelin Bay. Various forms of nitrogen and phosphorus concentrations were higher during the warm season （July--September）, which was due to the increased decomposition and concentration of organic matter resulted from the fast growth and high mortality of the cultured species. Compared with July 2002, TkN and TP contents were much higher in July 2003, in consonance with the eutrophication of the Zhelin Bay. Because exchangeable phosphorus （Ex-P）, iron-bounded phos- phorus （Fe-P） and organic phosphorus （OP） combined accounted for 34.3% of the TP and authigenic phosphorus （Au-P
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| 关 键 词： | 广东 海洋生物养殖区域 沉积物 水质 有机质 氮 磷 |
| 收稿时间： | 2007/2/12 0:00:00 |
| 修稿时间： | 2007/5/30 0:00:00 |
Water, organic matter, nitrogen and phosphorus contents in sediment of a large-scale mariculture area in the Zhelin Bay of eastern Guangdong Province, China |
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| DONG Qiaoxiang,LIN Jun,SHANG Xu,LI Jin,HUANG Changjiang.Water, organic matter, nitrogen and phosphorus contents in sediment of a large-scale mariculture area in the Zhelin Bay of eastern Guangdong Province, China[J].Acta Oceanologica Sinica,2008,27(2):133-148. |
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| Authors: | DONG Qiaoxiang LIN Jund SHANG Xu LI Jin and HUANG Changjiang |
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| Institution: | 1.School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou 325035, China2.School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou 325035, China;Florida Institute of Technology, Melbourne, Florida 32901-6975, USA |
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| Abstract: | The Zhelin Bay is one of the most important bays for large-scale maricuhure in Guangdong Province,China.Owing to the increas-ing human population and the expanding marieuhure in the last two decades,the ecological environment has greatly changed with frequent harmful algal blooms.A monthly survey of water content,organic matter ( TOM ),and various forms of nitrogen and phosphorous in sediment from July 2002 to July 2003 in the bay was conducted.The results showed that the water content was cor-related significantly with TOM and various forms of nitrogen and phosphorus and can be used as proxy for quick and rough estimate of these factors in the future surveys.TOM was also correlated significantly with various forms of nitrogen and phosphorus,indica-ting that it was one of the key factors affecting the concentrations and distributions of nitrogen and phosphorus in the investigated waters. Average total Kjeldhal nitrogen (TkN) Content was( 1113.1±382.5 )μg/g and average total phosphorus (TP) content was(567.2 ± 223.3)μg/g, and both were much higher than those of similar estuaries in China and elsewhere. Average nitrogen and phosphorus tended to be higher inside than outside the bay,higher at aquaculture than non-aquacuhure areas,and higher at fish-cage culture than oyster culture areas,suggesting that large-scale mariculture inside the bay played an important role in the eutrophication of the Zhelin Bay.Various forms of nitrogen and phosphorus concentrations were higher during the warm season (July--September),which was due to the increased decomposition and concentration of organic matter resulted from the fast growth and high mortality of the cultured species.Compared with July 2002,TkN and TP contents were much higher in July 2003,in consonance with the eut~'ophication of the Zhelin Bay.Because exchangeable phosphorus ( Ex-P),iron-bounded phos-phorus (Fe-P) and organic phosphorus (OP) combined accounted for 34.3% of the TP and authigenie phosphorus (Au-P) ac-counted for 49.2% of the TP,biological phosphorus (BP) that includes Ex-P,Fe-P,OP,and a portion of Au-P,thus accounted for 34.3% to 83.5% of the TP in the Zhelin Bay,which was within the percentage range,but with a high absolute value among the estuaries.Au-P was the most important species of phosphorus and accounted for 49.2% of the TP during the investigation.Since eutrophication in the water column can lead to reduction of pH in sediment and release of phosphorus in Au-P combined with anthigenic spodiosite and calcium carbonate,high content of Au-P in the sediment maybe act as a time bomb that can trigger a vi-cious cycle of eutrophication and large-scale harmful algal bloom in the Zhclin Bay. |
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| Keywords: | Zhelin Bay sediment nitrogen phosphorus water content organic matter |
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