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| Effects of loach disturbance on arsenic in soil pore water of paddy field |
| Received:January 04, 2024 |
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| KeyWord:loach;planar light pole;rice field soil;pH sensing film;DO sensing film;As |
| Author Name | Affiliation | E-mail | | BA Degong | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | | | ZHOU Yimin | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | | | WU Jiameng | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | | | FU Yiqiang | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | | | LI Bingyu | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | | | LEI Ming | College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China | leiming8297@163.com |
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| Abstract: |
| In order to explore the effects of loach disturbance of different stocking densities（low density, medium density and high density） on the arsenic（As）content in soil pore water, the surface soil of paddy field in Liuyang, Hunan Province was collected, and the changes of As content in soil pore water disturbed by loach were studied using loach As disturbance organism, providing basic data for further research on As cycling in soil-water environment. The results showed that after the disturbance of loach, soil pH first increased and then decreased with time, the diffusion layer widened, and gradually spread to the deep soil. The soil pH of loach group was as follows：medium density group>low density group>high density group, soil dissolved oxygen（DO）in low density group and medium density group was significantly higher than that in control group and high density group（P<0.05）, and soil DO in medium density group was slightly higher than that in low density group, suggesting that medium density group had stronger disturbance ability than other density groups. The pH and DO gradients at the soil-water interface changed significantly. The DO gradients at the soil-water interface in low-density and medium-density groups were larger than those in the high-density group, and the stratification was obvious. The DO of each treated soil system was：overlying soil water>soil-water interface>soil. Loach disturbance promoted the migration and release of As from soil to overlying water and significantly increased the content of As in overlying water. The promotion effect of low density group was more significant than that of medium density group and high density group. The As content of soil pore water in each treatment gradually decreased with time（except in the flooding period）, and migrated from the deep soil to the soil-water interface, showing that the surface soil was less than the deep soil. The disturbance of loach could significantly reduce the As content of soil pore water, especially in the low density group and the medium density group. It also promoted the migration and release of As from soil to soil-water interface. On day 7, the content of As in soil pore water of the loach group showed the most significant change throughout the entire soil depth. The content of As in the low-density group was significantly lower than that in the medium-density and high-density groups, indicating that the promotion effect of the low-density group was more significant than that in the medium-density and high-density groups, which was consistent with the results of soil overlying water. The study shows that the disturbance of loach significantly reduces the As content in soil pore water, in which the low density group and the medium density group promote the reduction of As content in soil pore water at different depths, and also promote the migration and release of As in soil to the soil-water interface. |
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