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| Effects of organic matter decomposition on the growth and physiology of Myriophyllum spicatum |
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Abstract With the sediment applied with 0, 0.5%, and 1% organic matter (plant residues) as the substrate, a simulating experiment was conducted to study the impacts on the growth and physiology of Myriophyllum spicatum during the decomposition of plant residues. The growth of submerged plants was inhibited by adding plant residues into sediment at early stage. Comparing with those in control, the growth of the Myriophyllum spicatum at 0.5% addition treatment was promoted in the whole process, and their plant and root biomass were increased about 12.99% and 125.31%, respectively. In contrast, the growth of Myriophyllum spicatum was inhibited under the condition of 1% addition treatment. Total chlorophyll (Chla) and soluble protein (Pro) content of the plant decreased with the organic matter addition before 16d, while the syntheses of chlorophyll and protein were promoted in 0.5% addition treatment ultimately. At the 0.5% addition treatment, SOD activities increased all the time. With 1% organic matter addition and longer treatment time, the activities of SOD was increased firstly and decreased then. The malondialdehyde (MDA) content of plant in 1% addition treatment was increased about 20.13% in comparison with control at early stage, but had no significant changes with that of 0.5% addition treatment, these results indicate that a small amount of organic matter addition could promote the growth and physiology of Myriophyllum spicatum, but the physiology activities was negatively influenced by a large amount of organic matter addition.
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Received: 28 January 2011
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