Removal effect of nitrogen and phosphorus in the return flow of rice paddy in Ningxia yellow river irrigation region by five plants cultivated on floating-bed
HONG Yu1,, WANG Ying2, WANG Fang1,,, LIU Ruliang1, LIU Ting3 1.Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China 2.School of Agriculture, Ningxia University, Yinchuan 750021, China 3.College of Environment and Resources, Fuzhou University, Fuzhou 350116, China
Abstract:In order to investigate the application of the floating bed and explore the effective measures for agricultural non-point source pollution control, five kinds of local plants (Canna indica, Lythrum salicaria, Iris pseudacorus, Ipomoea aquatica and Oryza sativa) were cultivated on the floating-bed in the return flow ditches of rice paddy to compare their removal effects of nitrogen and phosphorus. The results showed that the biomass of the five kinds of floating bed plants increased significantly in the return flow of rice paddy for four months cultivation. The biomass growth of Canna indica was the largest, which was 97.2 g·plant?1, and it was followed by Lythrum salicaria with 81.3 g·plant?1. The survival rate of Ipomoea aquatica was the highest with a value of 91.67%, and it was followed by Canna indica with 87.50%, while the survival rate of Oryza sativa was the lowest with a value of only 60.71%. The total nitrogen concentrations in stems/leaves and roots of Lythrum salicaria were the highest, which were 0.85% and 0.65%, respectively. The total phosphorus concentrations in stems/leaves and roots of Canna indica were the highest, which were 0.15% and 0.17%, respectively. The largest nitrogen uptake amount occurred in Ipomoea aquatica with a value of 14 239.46 mg·m?2, which was followed by Canna indica with 10 798.00 mg·m?2. The largest phosphorus uptake amount occurred in Oryza sativa with a value of 407.11 mg·m?2, which was followed by Ipomoea aquatica with 374.41 mg·m?2. The total nitrogen (TN) removal efficiency in the return flow of rice paddy by Ipomoea aquatica was the highest with a value of 85.88%, which was followed by Canna indica with 81.67%. The total phosphorus (TP) removal efficiency in the return flow of rice paddy by Ipomoea aquatica was the highest with a value of 80.32%, which was followed by Oryza sativa with 72.86%. Therefore, Ipomoea aquatica and Canna indica cultivated on floating-bed were recommended as the main plants for improving the water quality of farmland drainage ditch in Ningxia yellow river irrigation region. Key words:plants cultivated on floating-bed/ nitrogen and phosphorus removal/ return flow of rice paddy/ yellow river irrigation region.
图1浮床植物生物量的变化 Figure1.Change of biomass of the tested plants
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Removal effect of nitrogen and phosphorus in the return flow of rice paddy in Ningxia yellow river irrigation region by five plants cultivated on floating-bed
1.Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China 2.School of Agriculture, Ningxia University, Yinchuan 750021, China 3.College of Environment and Resources, Fuzhou University, Fuzhou 350116, China Received Date: 2018-10-26 Accepted Date: 2019-06-05 Available Online: 2020-11-11 Keywords:plants cultivated on floating-bed/ nitrogen and phosphorus removal/ return flow of rice paddy/ yellow river irrigation region Abstract:In order to investigate the application of the floating bed and explore the effective measures for agricultural non-point source pollution control, five kinds of local plants (Canna indica, Lythrum salicaria, Iris pseudacorus, Ipomoea aquatica and Oryza sativa) were cultivated on the floating-bed in the return flow ditches of rice paddy to compare their removal effects of nitrogen and phosphorus. The results showed that the biomass of the five kinds of floating bed plants increased significantly in the return flow of rice paddy for four months cultivation. The biomass growth of Canna indica was the largest, which was 97.2 g·plant?1, and it was followed by Lythrum salicaria with 81.3 g·plant?1. The survival rate of Ipomoea aquatica was the highest with a value of 91.67%, and it was followed by Canna indica with 87.50%, while the survival rate of Oryza sativa was the lowest with a value of only 60.71%. The total nitrogen concentrations in stems/leaves and roots of Lythrum salicaria were the highest, which were 0.85% and 0.65%, respectively. The total phosphorus concentrations in stems/leaves and roots of Canna indica were the highest, which were 0.15% and 0.17%, respectively. The largest nitrogen uptake amount occurred in Ipomoea aquatica with a value of 14 239.46 mg·m?2, which was followed by Canna indica with 10 798.00 mg·m?2. The largest phosphorus uptake amount occurred in Oryza sativa with a value of 407.11 mg·m?2, which was followed by Ipomoea aquatica with 374.41 mg·m?2. The total nitrogen (TN) removal efficiency in the return flow of rice paddy by Ipomoea aquatica was the highest with a value of 85.88%, which was followed by Canna indica with 81.67%. The total phosphorus (TP) removal efficiency in the return flow of rice paddy by Ipomoea aquatica was the highest with a value of 80.32%, which was followed by Oryza sativa with 72.86%. Therefore, Ipomoea aquatica and Canna indica cultivated on floating-bed were recommended as the main plants for improving the water quality of farmland drainage ditch in Ningxia yellow river irrigation region.
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