| Potential effect of sedimentary iron-phosphorus accumulation on frequent algal bloom in the Pearl River Estuary |
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| 作者姓名： | WENG HuanXin SUN XiangWei CHEN JingFeng CHEN JianFang CHEN LiHong CHEN XiangHua & QIN YaChao Institute of Environment & Biogeochemistry Zhejiang University Hangzhou China Second Institute of Oceanography State Oceanic Administration Hangzhou China |
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| 作者单位： | WENG HuanXin1，SUN XiangWei1，CHEN JingFeng1，CHEN JianFang2，CHEN LiHong2，CHEN XiangHua1 & QIN YaChao1 1 Institute of Environment & Biogeochemistry，Zhejiang University，Hangzhou 310027，China; 2 Second Institute of Oceanography，State Oceanic Administration，Hangzhou 310027，China |
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| 摘 要： | Based on laboratory culture of harmful alga on iron and phosphorus uptake, and the study of accu-mulation of iron-phosphorus in cores and release of iron and phosphorus from surficial sediments collected in the Pearl River Estuary, the reasons of the high frequency of phytoplankton bloom therein are discussed. The results show that Fe starvation can make algal growth rate slow down and the peak of cell number decrease. Fe and P contents in algal cell bear a significant correlation and the molar ratio of P:Fe is ~356:1, suggesting that algal uptake of Fe and P is synergistic. Total Fe and total P in sediments are positively correlated and Fe-P is the main species of inorganic sedimentary P. Through continuous leaching with agitation, 34.26%―80.21% of exchangeable P and 4.04%―22.52% of ex-changeable Fe are released from surficial sediments, implying that the accumulation of Fe-P in sedi-ments is available for providing nutrients (P and essential Fe) for the demand of phytoplankton bloom. These factors might be responsible for a higher frequency of red tides than other marine regions.
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| 收稿时间： | 12 September 2005 |
| 修稿时间： | 12 April 2006 |
Potential effect of sedimentary iron-phosphorus accumulation on frequent algal bloom in the Pearl River Estuary |
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| WENG HuanXin,SUN XiangWei,CHEN JingFeng,CHEN JianFang,CHEN LiHong,CHEN XiangHua & QIN YaChao Institute of Environment & Biogeochemistry,Zhejiang University,Hangzhou ,China, Second Institute of Oceanography,State Oceanic Administration,Hangzhou ,China.Potential effect of sedimentary iron-phosphorus accumulation on frequent algal bloom in the Pearl River Estuary[J].Science in China(Earth Sciences),2007,50(3):453-461. |
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| Authors: | Weng HuanXin Sun XiangWei Chen JingFeng Chen JianFang Chen LiHong Chen XiangHua Qin YaChao |
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| Institution: | 1. Institute of Environment & Biogeochemistry, Zhejiang University, Hangzhou 310027, China
2. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310027, China |
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| Abstract: | Based on laboratory culture of harmful alga on iron and phosphorus uptake, and the study of accumulation of iron-phosphorus
in cores and release of iron and phosphorus from surficial sediments collected in the Pearl River Estuary, the reasons of
the high frequency of phytoplankton bloom therein are discussed. The results show that Fe starvation can make algal growth
rate slow down and the peak of cell number decrease. Fe and P contents in algal cell bear a significant correlation and the
molar ratio of P:Fe is ∼356:1, suggesting that algal uptake of Fe and P is synergistic. Total Fe and total P in sediments
are positively correlated and Fe-P is the main species of inorganic sedimentary P. Through continuous leaching with agitation,
34.26%–80.21% of exchangeable P and 4.04%–22.52% of exchangeable Fe are released from surficial sediments, implying that the
accumulation of Fe-P in sediments is available for providing nutrients (P and essential Fe) for the demand of phytoplankton
bloom. These factors might be responsible for a higher frequency of red tides than other marine regions.
Supported by the National Natural Science Foundation of China (Grant Nos. 40172106 and 40572175) |
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| Keywords: | sedimentary Fe-P iron limitation harmful algal bloom Pearl River Estuary |
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