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大型海藻龙须菜对浮游植物群落结构影响的实验研究

ISSN号：1008-8873
期刊名称：《生态科学》
时间：0
分类：Q931.1[生物学—微生物学]
作者机构：[1]暨南大学水生生物研究所,广东省教育厅水体富营养化与赤潮控制重点实验室,广州510632, [2]汕头大学海洋生物研究所,汕头515063
相关基金：基金项目：国家自然科学基金项目（U0633006,40873065）和广东省教育厅重点项目资助. 5 致谢（Acknowledgement）感谢暨南大学水生所邓邦平、卢慧明、王庆、胡晓娟、张俊、刘擎和辛建峰等在实验过程中给予的帮助.感谢暨南大学赤潮与水环境研究中心吕颂辉教授在藻类鉴定方面给予的指导.感谢汕头大学南澳实验站提供受控实验的便利.

关键词：龙须菜, 浮游植物, 群落结构, Gracilaria lemaneiformis, phytoplankton, community structure

中文摘要：

2008年3月采用室内中型受控系统，开展了大型海藻龙须菜（Gracilaria lemaneiformis）对浮游植物群落结构影响的实验研究。实验培养池为9个2m×0.7m×1m的培养池，注入1000L沙滤海水。实验设置3个处理组：对照组（未添加龙须菜）、3kg龙须菜组和6kg龙须菜组，每组3个平行，实验周期为10d。结果表明，未添加龙须菜的对照组发生了中肋骨条藻赤潮，水体浑浊并伴有恶臭，浮游植物细胞密度峰值为3.88×107 cells·L^-1，叶绿素a浓度峰值为43.87μg·L^-1；3kg和6kg龙须菜处理组水体浮游植物细胞密度最高值分别为3.78×106 cells·L^-1和1.33×106cells·L^-1，叶绿素a浓度最高值分别为15.16μg·L^-1和6.69μg·L^-1，均显著低于对照组（p≤0.01）。龙须菜处理组浮游植物种类较多，群落结构较稳定。大型海藻龙须菜作为富营养化水体生物修复材料，可有效提高水质和防治赤潮。

英文摘要：

In order to evaluate the effect of seaweed Gracialria lemaneiformis on the phytoplankton community, an indoor enclosure experiment was carried out in March 2008. Nine pools with a capacity of 1 400 L were filled with 1 000 L filtrated seawater. There were three treatments in the experirnent, namely control（without addition of G. lemaneiformis）, 3 kg G. lemaneiformis treatment and 6 kg G. lemaneiformis treatment, respectively. The experimental period lasted for 10 days. During the experiment, a Skeletonema costatum algal bloom occurred in the control group with the phytoplankton cell density reaching to 3.88×10^7 cells-L^-1 at the 8^th day, which was significantly higher than the groups with seaweed addition. The highest chlorophyll-a concentration was 43.87 μg·L^-1 in the control group. Low levels of the phytoplankton cell density and chlorophyll-a concentration were observed in the pools with G lemaneiformis. The highest phytoplankton cell densities of 3 kg and 6 kg group were 3.78×10^6 cells·L^-1 and 1.33×10^6 cells·L^-1, respectively. The highest chlorophyll-a concentrations of 3 kg and 6 kg group were 15.16 μg·L^-1 and 6.69 μg·L^-1, respectively. G. lemaneiformis could optimize the phytoplankton community structure meanwhile. This study demonstrates that G. lemaneiformis is a good bioremediation material to improve water quality and thus to prevent red tide occurrence.

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