Sediment water,organic matter,nitrogen and phosphorus contents in a large-scale mariculture located in Zhelin Bay,eastern Guangdong Province,China

HUANG Chang-jiang; DONG Qiao-xiang; LIN Jun-da; SHANG Xu; LI Jin

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HUANG Chang-jiang, DONG Qiao-xiang, LIN Jun-da, SHANG Xu, LI Jin. Sediment water,organic matter,nitrogen and phosphorus contents in a large-scale mariculture located in Zhelin Bay,eastern Guangdong Province,China[J]. Haiyang Xuebao, 2008, 30(2): 38-50.

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Sediment water,organic matter,nitrogen and phosphorus contents in a large-scale mariculture located in Zhelin Bay,eastern Guangdong Province,China

School of Environmental Science and Public Health, Wenzhou Medical College, Wenzhou, Zhejiang 325035, China

Received Date: 2007-02-07
Rev Recd Date: 2007-05-10

Abstract

Abstract

Zhelin Bay is one of the most important bays for large scale mariculture in Guangdong Province, China. Due to the increasing human population and the expanding mariculture in the last two decades,the ecological environment has greatly changed with frequent harmfulalgal blooms. We conducted a monthly survey of water content(W),organic matter(TOM),and various forms of nitrogen(N)and phosphorous (P)in the sediment from July 2002 to July 2003. The results show that water content correlated highly significantly with TOM and various forms of N and P and can be used as proxy for quick and rough estimate of these factor in the future surveys. TOM also correlated significantly with various forms of N and P,indicating that it is one of the key factors to affect the concent rations and distributions of N and P in the investigated waters. A veragetotal Kjeldhalnitrogen(TkN)and total phosphorus(TP)was(1 113.1±382.5) μg/g and(567.2±223.3)μg/g,respectively,much higher than those of similar estuaries in China and else-where. Average N and P tended to be higher inside than out side the bay,higher at aquaculture than non-aquaculture areas,and higher at fish-cageculture than oyster culture areas,suggesting that large-scale mariculture inside the bay play an important role in the eutrophication of Zhelin Bay. Various forms of N and P concent rations were higher during the warm season(July-Sept ember),due to the increased decom position and concentration of organic matter resulted from the fast growth and high mortality of the cultured species. Compared to July of 2002,TkN and TP were much higher in July of 2003,in consonance with the eutrophication of the Zhelin Bay. Since BP(biologiccal phosphorus)in the sediment includes Ex-P(exchangable phosphorus),Fe-P(iron-bouned phosphorus),OP(organic phosphorus)and some Au-P (aut higenic pho spho rus). Since Ex-P,Fe-P and OP combined accounted for 34.3%of the TP and Au-P accounted for 49.2% of the TP,BP in Zhelin Bay accounted for 34.3%to 83.5%of the T P,within the percentage range,but with a high absolute value among the est uaries.Au-P was the most important species of P and accounted for 49.2%of the TP during the investigation.Since eutrophication in the water column canlead to reduction of pH in the sediment and release of phosphorus in Au-P combined with authigenic spodiosite and calcium carbonate,high concent ration of Au-P in the sediment maybe atimebomb that can trigger avicious cycle of eut rophication and large-scale harmful algal bloom in Zhelin Bay.
- Zhelin Bay,
- sediment,
- nitrogen,
- phosphorus,
- water content,
- organic matter

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References(54)

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