Microcosm experiments on the influence of different N/P ratios on phytoplankton community structure in the coast of Zhejiang Province

HUANG Wei; ZHU Xuyu; ZENG Jiangning; CHEN Quanzhen; XU Xiaoqun; LIAO Yibo; LIU Jingjing; DU Ping

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HUANG Wei, ZHU Xuyu, ZENG Jiangning, CHEN Quanzhen, XU Xiaoqun, LIAO Yibo, LIU Jingjing, DU Ping. Microcosm experiments on the influence of different N/P ratios on phytoplankton community structure in the coast of Zhejiang Province[J]. Haiyang Xuebao, 2012, 34(5): 128-138.

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Microcosm experiments on the influence of different N/P ratios on phytoplankton community structure in the coast of Zhejiang Province

Key Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration, The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2012-01-15
Rev Recd Date: 2012-06-05

Abstract

Abstract

In order to better understand the effects of different nitrogen-phosphorus (N/P) ratios (1:1,4:1,8:1,16:1,32:1,64:1,128:1 and 256:1) on phytoplankton community structure,a microcosm experiment was conducted for 30 days during the autumn near Dongtou Island in the East China Sea.The results indicated that the diversity indices,species composition and community succession of the phytoplankton community varied significantly with the N/P ratios.The values of H',Ma,J and D_r were lower in the low N/P ratio treatment (1:1) during the early phase of culture (day 6 to 12),while the values of H',J and D_r were lower in the 8:1 and 16:1 treatments at the end of culture.On the other hand,a higher cell abundance of diatom was observed in the high N/P ratio treatments (128:1 and 256:1) on day 6 and in the 8:1 and 16:1 treatments on day 30.Moreover,a definite community succession order from diatoms to dinoflagellates was observed in all treatments which was in accordance with the result reported in other studies conducted in the East China Sea,therefore,we speculate that the order of phytoplankton succession cultured (enclosure or in-laboratory) was related to the changed environment factors rather than its initial composition.
- Phytoplankton,
- nutrients,
- community structure,
- diversity index,
- community succession

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References(41)

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