Effects of Aquatic Plant and Phytoplankton on Concentrations of Size-fractionated Iron in Algal Controlling Enclosures
Effects of Aquatic Plant and Phytoplankton on Concentrations of Size-fractionated Iron in Algal Controlling Enclosures
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发表时间：
2006
影响因子：
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通讯作者：
Liu Yongding
中科院分区：
文献类型：
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作者：
Liu Yongding
Iron is essential for aquatic plant and algal growth and plays an important role in their physiology and ecology.In this experiment,enclosures were used to study effects of algae and aquatic plant on the dynamic changes of size-fractionated iron concentrations in four enclosures.In turn,we may discuss the ecophysiological function of iron during the formation and disappearance of cyanobacterial bloom,and also provide some evidences for exploring the treatment of cyanobacterial blooms through this study.The experiments were conducted near the shore of Lake Dianchi.From June to October 2003,water samples were collected periodically from the four enclosures to measure concentrations of ferrous iron,particulate iron(0.22 μm),small colloidal iron(0.22 μm~0.025 μm),soluble iron(0.025 μm) and chlorophyll a.The composition of algae was also identified and the number of phytoplankton was counted in the four enclosures.The results showed that particulate iron,small colloidal iron and soluble iron could transform each other.Significant correlations were obtained between ferrous concentration and the number of algae in Xanthophyta(r=0.858,P=0.000 4,N=20),and significant correlations were also found between different iron forms and chlorophyll a except for ferrous(r=0.630,P=0.003,N=20).Ferrous iron was a direct uptake form by aquatic plant and algae.Changes of algal composition and number had no marked effect on the concentrations of different iron forms.
