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间歇灌溉对稻田毒死蜱迁移转化特征的影响

刘慧云, 关卓, 程建华, 唐翔宇, 鲜青松

刘慧云, 关卓, 程建华, 唐翔宇, 鲜青松. 间歇灌溉对稻田毒死蜱迁移转化特征的影响[J]. 农业工程学报, 2020, 36(1): 214-220. DOI: 10.11975/j.issn.1002-6819.2020.01.025
引用本文: 刘慧云, 关卓, 程建华, 唐翔宇, 鲜青松. 间歇灌溉对稻田毒死蜱迁移转化特征的影响[J]. 农业工程学报, 2020, 36(1): 214-220. DOI: 10.11975/j.issn.1002-6819.2020.01.025
Liu Huiyun, Guan Zhuo, Cheng Jianhua, Tang Xiangyu, Xian Qingsong. Effects of intermittent irrigation on reactive transport behavior of chlorpyrifos in paddy field[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2020, 36(1): 214-220. DOI: 10.11975/j.issn.1002-6819.2020.01.025
Citation: Liu Huiyun, Guan Zhuo, Cheng Jianhua, Tang Xiangyu, Xian Qingsong. Effects of intermittent irrigation on reactive transport behavior of chlorpyrifos in paddy field[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2020, 36(1): 214-220. DOI: 10.11975/j.issn.1002-6819.2020.01.025

间歇灌溉对稻田毒死蜱迁移转化特征的影响

基金项目: 国家重点研发计划课题(2016YFD0800203);中国科学院"西部之光"项目;中国科学院成都山地所"一三五"重点培育方向性项目(SDS-135-1702)

Effects of intermittent irrigation on reactive transport behavior of chlorpyrifos in paddy field

  • 摘要: 间歇灌溉作为丘陵区稻田常见的灌溉方式之一,其强烈的干湿交替过程会影响稻田中污染物的环境行为。在室内批量平衡吸附试验的基础上,通过农药野外喷施试验与动态观测,研究了间歇淹水和持续淹水条件下石灰性紫色土发育的稻田中毒死蜱的迁移转化特征。结果表明,土壤对毒死蜱的吸附能力远远强于其对毒死蜱主要降解产物3,5,6-三氯-2-吡啶醇(3,5,6-TCP)的吸附能力,毒死蜱的吸附容量常数范围为34~170,TCP的吸附容量常数范围为0.62~0.67,且对毒死蜱和TCP的吸附容量常数及分配系数均以耕作层土壤高于非耕作层土壤;施药后田面水中毒死蜱及TCP的浓度均随时间迅速下降,两者均可通过土壤大孔隙优先流快速迁移至50 cm深处;间歇灌溉处理稻田土壤孔隙水中两者的浓度总体低于持续淹水处理;降雨和灌溉事件会导致两者由土壤固相迅速向水相发生短时间、高浓度释放与淋失。
    Abstract: Intermittent irrigation is one common practice of water management in paddy field of hilly areas, and the intense alternating wet and dry process may have a significant effect on the environmental behavior of various pollutants. Based on the laboratory batch equilibrium adsorption experiment, isotherms of the insecticide chlorpyrifos and its major degradation product 3,5,6-trichloro-2-pyridinol (TCP) in the cultivated layer (0-20 cm) and underlying uncultivated layers (20-50 cm) of the paddy fields of calcareous purple soil were obtained and fitted by the linear and Freundlich models. During the rice-growing season, field application of chlorpyrifos in paddy soils and continuous on-site monitoring were carried out for the observation of temporal changes in the concentration of both chlorpyrifos and TCP in the floodwater and soil pore water at different depths. The results obtained under the conditions of intermittent irrigation and continuous flooding were compared. The results showed that the adsorption isothermal data for both chlorpyrifos and TCP fitted well both models. The calculated values of Freundlich sorption capacity and linear distribution coefficient for chlorpyrifos and TCP were found higher for the cultivated soil layer than those for the uncultivated layers. For all the tested soil samples, chlorpyrifos had much higher values of Freundlich sorption capacity (in the range of 34 to 170) and linear distribution coefficient (in the range of 44 to 171) than those for TCP, which had Freundlich sorption capacity and linear distribution coefficient in the range of 0.62 to 0.67 and 0.47 to 0.78, respectively. This indicated that chlorpyrifos could be easily adsorbed to the soil and maintained in the surface soil, while TCP could easily migrate and disperse in the environment. Following the pesticide application, concentrations of chlorpyrifos and TCP in the floodwater decreased rapidly with time and reached to stable low levels (i.e., 10% of initial concentrations) within the first 3 and 6 days, respectively. Chlorpyrifos was mostly adsorbed in the cultivated soil layer, while TCP was mainly found in the aqueous phase of both cultivated and uncultivated layers. Both chlorpyrifos and TCP could reach the depth of 50 cm with infiltrating water via various soil macropores (e.g., cracks, worm burrows, and root channels). Irrigation method had shown an effect on their concentrations in soil pore water, with concentrations generally found lower under intermittent irrigation as compared to continuous flooding. Apparently, water movement in paddy field exerted a greater impact on the TCP concentration in soil pore water of the cultivated soil layer under intermittent irrigation. After draining out the floodwater, the TCP concentration of soil pore water at the 10 cm depth decreased rapidly and remained stable after re-irrigation; in the contrast, TCP increased steadily during the first 3 weeks following chlorpyrifos application under continuous flooding condition. In addition, rain events during the floodwater draining periods and irrigation events had resulted in the transient releases of both chlorpyrifos and TCP from the soil solid phase to the aqueous phase, followed by subsequent leaching at elevated concentrations. Such effect was found more apparent for TCP, which had a lower sorptivity than its parent compound chlorpyrifos. The marked decreases in the concentrations of chlorpyrifos and TCP with time in soil pore water at the depth of 10 cm during the floodwater draining periods may be attributed to the enhanced degradation of both compounds under the improved oxidative conditions. The results above have suggested that, in future research, due attention should be paid to the environmental behavior of TCP in paddy fields at lowlands of hilly areas that may pose a risk to the shallow groundwater used as drinking water source for surrounding rural residents.
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  • 收稿日期:  2019-05-16
  • 修回日期:  2019-10-09
  • 发布日期:  2019-12-31

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