Plant growth and nutrient removal in constructed monoculture and mixed wetlands related to stubble attributes |
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Authors: | Ze-Chu Qiu Meng Wang Wen-Ling Lai Feng-Hua He and Zhang-He Chen |
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Institution: | (1) Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, and Guangdong Provincial Key Lab of Biotechnology for Plant Development, College of Life Science, South China Normal University, Guangzhou, 510631, People’s Republic of China; |
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Abstract: | The aim of this study is to test the hypothesis that it depends on plant species used in the wetlands and their stubble growth
attributes, as to whether monoculture or mixed wetland is superior in plant growth and nutrient removal. Monoculture and mixed
wetland microcosms of five wetland plant species were studied. Significant differences in growth and aboveground biomass were
found in the monoculture wetlands. Species that showed faster growth and larger biomass in monoculture wetland were also dominant
in the mixed wetland. The mixed wetland exhibited similar biomass and root growth to the averages of five monocultures. ANOVA
showed that there were very significant differences among the wetlands in removal rates of all the nutrients studied except
nitrate nitrogen (NO3-N) and chemical oxygen demand (COD). The removal rates from the mixed wetland were generally comparable to the highest removal
rates from the monocultures. The species exhibited different stubble growth attributes, with some species showing increasing
stubble growth and removal rates, while other species showing decreasing stubble growth and removal rates. The results indicated
that in both monocultures and mixed constructed wetlands, growth and nutrient removal rates depended on plant species, and
attributes of plant stubble growth affected overall growth and nutrient removal capabilities. |
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