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| Effects of oxalic acid on oil sunflower biomass, enzyme activity, and the Cd speciation of Cd-polluted soils |
| Received:March 02, 2020 |
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| KeyWord:oxalic acid;oil sunflower;enzyme activity;dry matter quality;cadmium forms;cadmium removal rate |
| Author Name | Affiliation | E-mail | | HAN Yang | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | QIAO Dong-mei | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | qiaodongmei78@163.com | | QI Xue-bin | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | LI Zhong-yang | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | HU Chao | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | LU Hong-fei | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | ZHAO Yu-long | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | BAI Fang-fang | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | | | PANG Ying | 1. Farmland Irrigation Research Institute, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
2. Agricultural Water Soil Environmental Field Research Station of Xinxiang, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China
3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources, Chinses Academy of Agricultural Sciences, Xinxiang 453000, China | |
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| Abstract: |
| The effects of oxalic acid concentration and application time on the soil enzyme activity, dry matter content of oil sunflower, and content of different forms of Cd in Cd-polluted soils were studied using a pot experiment, with sunflowers as the test plant. The effects of different oxalic acid concentrations(i.e., 1, 2, 3, 4, 5, and 6 mmol·kg-1)and application times(i.e., 20, 30, 40, and 50 days after emergence)on soil pH, enzyme activity, and the dry matter content of oil sunflowers and content of Cd in different forms was analyzed in this study. The results indicated that the application of oxalic acid promoted the activities of catalase and invertase in the soil, which were 4%~84.4% and 2%~147% higher than that of treatment without oxalic acid(CK). The application of oxalic acid could also improve the dry weight of the above-ground part and root of oil sunflower; it was 7%~126% and 11.4%~139% higher than that of CK. The dry weights of the above-ground parts and root of sunflowers were the highest at acid concentrations of 2~3 mmol·kg-1 and application times of 30~40 days. Oxalic acid also reduced the exchangeable, Fe-Mn oxide and organic matter-bound Cd content in the soil. These exchangeable, bound Cd contents were the lowest in the rhizosphere soil at acid concentrations of 2~3 mmol·kg-1 and application times of 30~40 days. When oxalic acid was applied at a concentration of 4 mmol·kg-1 30 days after the emergence of oil sunflowers, the rate of Cd removal in the rhizosphere soil was maximized at 88.4%, higher than that of CK. Therefore, oxalic acid could be used to effectively improve the ability of oil sunflowers to repair Cd-polluted soils, which has potential for soil remediation applications. |
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