Effects of decomposition of Pistia stratiotes on water quality
 under different dissolvedoxygen conditions

doi:10.3969/j.issn.1000-2006.201609062

Effects of decomposition of Pistia stratiotes on water quality under different dissolvedoxygen conditions

XI Wenjuan, LIU Jing, WANG Wei, NIU Yuchen, XU Chi, LIU Maosong

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06) : 127-133.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (06) : 127-133. DOI: 10.3969/j.issn.1000-2006.201609062

Effects of decomposition of Pistia stratiotes on water quality under different dissolvedoxygen conditions

XI Wenjuan, LIU Jing, WANG Wei, NIU Yuchen, XU Chi, LIU Maosong

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Abstract

【Objective】Understanding the differences in the decomposition of aquatic plants and water quality under different dissolved-oxygen levels plays an important role in plant residue management and water-quality control. 【Method】A eutrophic aquatic environment was simulated using a plastic box with Pistia stratiotes under conditions of non-inflated aeration(NA)and inflated aeration(IA).Under indoor and low-light conditions, water-quality indices were determined at different time points. Changes in the major water-quality indices during the decomposition of Pistia stratiotes were analyzed.【Result】Plant residue decomposed faster in the IA group than the NA group; however, the water-quality indices changed synchronously. The major water-quality indices in the initial decomposition stage(1-25 d)changed considerably, and was relatively stable in the subsequent stages(26-95 d).In the initial stage, the concentrations of NO^-₃-N and NO^-₂-N remained significantly higher in the IA group than the NA group, and the concentration of PO^3-₄-P remained lower in the IA group than the NA group; in the subsequent stages,in addition to NH⁺₄-N, values of the major indices were lower in the IA group than the NA group. In the IA group,the major water-quality indices reached maximum values simultaneously among different biomass levels. In the NA group, there was a delay in attaining maximum concentrations of NO^-₃-N, NO^-₂-N, and PO^3-₄-P,and the period of delay increased as the initial amount of plant biomass increased, particularly observable in variation in PO^3-₄-P concentration.【Conclusion】Generally, comparing with the effect of plant biomass, inflated aeration had a greater impact on water quality. Under the IA condition, the values of the major water-quality indices were higher than those in the NA group. There were significant differences in water quality between the two groups,especially at the initial stage of the study; however,at subsequent stages,the influence of inflated aeration on water quality indices was relatively small.

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XI Wenjuan, LIU Jing, WANG Wei, NIU Yuchen, XU Chi, LIU Maosong. Effects of decomposition of Pistia stratiotes on water quality under different dissolvedoxygen conditions[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(06): 127-133 https://doi.org/10.3969/j.issn.1000-2006.201609062

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