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| Decomposition of five emergent plants and their influence on water quality of wetlands |
| Received:March 13, 2019 |
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| KeyWord:emergent plant;decomposition;wetland;nutrient;water quality |
| Author Name | Affiliation | E-mail | | HU Hong-wei | School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China | | | LIU Pan | School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China | | | WU Jun-feng | Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China | | | LIANG Feng | Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China | | | XU Xiao-qin | School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China | | | GUO Yi-fei | School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China | | | LIU Biao | School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China | liubiao@hncj.edu.cn |
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| Abstract: |
| A 60-day indoor simulation experiment was conducted to study the decomposition process of five emergent plant species, Pontederia cordata, Acorus calamus, Canna indica, Thalia dealbata, and Cyperus alternifolius, and their influence on the water quality of wetlands. The decomposition rates of these species showed similar trends, and were rapid during the first six days but much slower from day 6 to day 60 in terms of biomass loss. At the end of the experiment, the weight loss of the five emergent plant species was in the order of Acorus calamus (69.40%) > Canna indica (68.42%) > Pontederia cordata (46.72%) > Cyperus alternifolius (34.33%) > Thalia dealbata (33.73%). During the decomposition process, the dynamics of TN concentration in plants changed within a small range, and the dynamics of TP concentration in plants decreased rapidly in the early stage of the experiment(0~6 d), and changed slightly from day 12 to the end of the experiment. The effect of the decomposition process of these five emergent plant species on water quality differed, but they all lead to considerable changes in water quality at the beginning of the experiment. The pH and DO of the water body decreased rapidly during the initial stage of the experiment and increased slowly thereafter. At the end of the experiment, the pH and DO values were less than the initial values, and pH was significantly negatively correlated with the plant decomposition rate(P<0.01). The changes in TP and inorganic nitrogen(NH4+-N, NO3--N, and NO2--N)in water were also different within the 60 days. The TP was negatively correlated with pH; however, a significant difference was found only in the Acorus calamus group and the Cyperus alternifolius group(P<0.01). The results showed that the decomposition of emergent plants has a time-dependent effect on wetland water quality. To avoid drastic changes in water quality, emergent plants should be harvested in the early stage of plant decline. |
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