| 摘要: |
| 附着藻类是清水态浅水湖泊的重要组成部分,为了解附着藻类对湖泊沉积物磷释放的影响,在室内柱状装置中,将尼龙网所培养的附着藻类加盖到太湖沉积物上,即处理组,并设置无附着藻类加盖的对照组,进行为期13d的实验.结果表明:加附着藻类的处理组中的无机磷释放速率显著低于无附着藻类的对照组.与对照组相比,实验期间加附着藻类的处理组释放到水体中的磷,平均减少1.16mg.其中附着藻类吸收了0.81mg磷(70%),而附着藻类通过光合作用改变沉积物表面的氧环境抑制了0.35mg磷的释放(30%).研究表明,底栖附着藻类可以通过吸收磷和抑制沉积物磷释放降低水中营养盐含量. |
| 关键词: 附着藻类 沉积物 磷释放 太湖 模拟 |
| DOI：10.18307/2010.0617 |
| 分类号: |
| 基金项目:国家科技支撑计划项目(2007BAC26B02);国家高新技术研究与发展项目(2006AA06Z337)资助 |
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| Simulation on the effect of periphytic algae on phosphorus release from sediments of Lake Taihu |
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ZHANG Qiang1,2, LIU Zhengwen1
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1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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| Abstract: |
| Periphytic algal community is an important autotrophic component of shallow lakes with clear water states. In order to understand the effect of periphytic algae on phosphorus release from lake sediments, a 13-day laboratory experiment was carried out by using Plexiglas tubes contained sediments from Lake Taihu, which covered with periphytic algae precultivated on nylon nets as treatments and without periphytic algae as controls. The results showed that rates of release of inoiganic phosphorus from sediments in the treatments with periphytic algae were significantly lower than that in the control without periphytic algae. During the experimental period, an average of 1.16mg phosphorus was reduced in treatments comparing with the controls, 70% (0.81 mg) of which was caused by phosphorus uptake of periphytic algae, and 30% (0.35mg) was attributed to reduction in phosphorus release from the sediments due to improved redox condition in sediment surface by photosynthetic activity of periphytic algae. Present study suggests that benthic (periphytic) algae can reduce phosphorus concentration in water by direct uptake and inhibition of sediment phosphorus release. |
| Key words: Periphytic algae sediment phosphorus release Lake Taihu simulation |
