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Eco-physiological characteristics of three emergent macrophyte species to concentration changes of COD, nitrogen and phosphorus
Sun Ruilian 1 * #,Liu Jian 2
1.Environment Research Institute, Shandong University, JiNan 250100
2. Insitute of Ecology and Biodiversity, Shandong University, Jinan 250100
*Correspondence author
#Submitted by
Subject:
Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.No. 20100131120078）, National , Excellent Young and Middle-Aged Scientists of Shandong Province（No.BS2010SF016）, Foundation for National Water Special Project（No.No. 2012ZX07203-004）, Independent Innovation Foundation of Shandong University（No.2012TS039）
Opened online:17 September 2013
Accepted by: none
Citation: Sun Ruilian,Liu Jian.Eco-physiological characteristics of three emergent macrophyte species to concentration changes of COD, nitrogen and phosphorus[OL]. [17 September 2013] http://en.paper.edu.cn/en_releasepaper/content/4559293
 
 
Three macrophyte species (Zizania latifolia Turcz., Iris pseudacorus L. and Typha latifolia L.) were studied in constructed microcosm wetlands in order to compare the ability of hydrophytes in purifying simulated polluted river water and to analyze plant responses to oxidative stress induced by chemical oxygen demand (COD), nitrogen and phosphorus. The results showed that planted microcosms were more effective in removing COD, total nitrogen (TN) and total phosphorus (TP) than unplanted microcosms. Among the three hydrophytes, Z. latifolia was superior for TN removal, while I. pseudacorus units showed the highest TP removal efficiency. However, there was no significant difference between planted units in COD removal efficiencies. The plasticity of I. pseudacorus was the best exposed to sewage, which was associated with significantly higher SOD and CAT activities with treatment T1. However, treated with low COD/N/P (T1), the MDA levels of T. latifolia and Z. latifolia were basically unaffected. In addition, treatment of polluted river water induced enhancement in proline level of three species. It can be concluded that the antioxidative defence system and free proline accumulation were activated but could not resist the oxidative stress in plants exposed to high concentrations of COD/N/P (≥160/30/4 mg L-1).
Keywords:Emergent macrophyte; Antioxidant enzyme; Nutrient removal; Zizania latifolia; Iris pseudacorus; Typha latifolia
 
 
 

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