Spatiotemporal dynamics and modeling of thiacloprid in paddy multimedia systems with the effect of wetting-drying cycles

Haomiao Cheng; Hanyang Xu; Min Guo; Tengyi Zhu; Wei Cai; Lingzhan Miao; Shu Ji; Guanlong Tang; Xiang Liu

doi:10.1016/j.envpol.2023.123187

Spatiotemporal dynamics and modeling of thiacloprid in paddy multimedia systems with the effect of wetting-drying cycles

Environ Pollut. 2024 Feb 15:343:123187. doi: 10.1016/j.envpol.2023.123187. Epub 2023 Dec 18.

Authors

Haomiao Cheng¹, Hanyang Xu², Min Guo³, Tengyi Zhu², Wei Cai², Lingzhan Miao⁴, Shu Ji², Guanlong Tang⁵, Xiang Liu⁶

Affiliations

¹ School of Environmental Science and Engineering, School of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225127, China. Electronic address: yzchhm@yzu.edu.cn.
² School of Environmental Science and Engineering, School of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225127, China.
³ Agricultural College, Yangzhou University, 225009, Yangzhou, China.
⁴ Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
⁵ School of Environmental Science and Engineering, School of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, 225127, China; Huaxin Design Group CO., Ltd., Wuxi, 214072, China.
⁶ College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China.

PMID: 38123113
DOI: 10.1016/j.envpol.2023.123187

Abstract

The widespread presence of thiacloprid (THI), a neonicotinoid, raises concerns for human health and the aquatic environment due to its persistence, toxicity, and bioaccumulation. The fate of THI in paddy multimedia systems is mainly governed by irrigation practices, but the potential impacts remain poorly documented. This study investigated the effects of water management practices on THI spatiotemporal dynamics in paddy multimedia systems by combining soil column experiments and a non-steady-state multimedia model. The results indicated the wetting-drying cycle (WDC) irrigation reduced THI occurrences in environmental phases (i.e., soil, interstitial water, and overlying water) and accelerated the THI loss through the THI aerobic degradation process. THI occurrences in the soil and water phases decreased from 18.8% for conventional flooding (CF) treatment to 9.2% for severe wetting-drying cycle (SW) treatment after 29 days, while the half-lives shortened from 11.1 days to 7.3 days, respectively. Meanwhile, the WDC decreased THI outflow from leakage water, which reduced the THI risk of leaching. There was no significant difference in THI plant uptake and volatilization between CF and WDC treatments. The mean proportions of THI fate in paddy multimedia systems followed the order: THI degradation (57.7%), outflow from leakage water (25.5%), occurrence in soil (12.4%), plant uptake (3.4%), occurrence in interstitial water (0.7%), occurrence in overlying water (0.3%), volatilization (<0.1%) after 29 days. The sensitivity analysis identified the soil organic carbon partition coefficient (K_OC) as the most sensitive parameter affecting THI's fate. In addition, the topsoil layers of 0-4 cm were the main sink of THI, holding 67% of THI occurrence in the soil phase. The THI occurrence in interstitial water was distributed evenly throughout the soil profile. These findings made beneficial theoretical supplements and provided valuable empirical evidence for water management practices to reduce the THI ecological risk.

Keywords: Dissipation; Fugacity approach; Neonicotinoids; Paddy multimedia systems; Soil column; Soil drying and re-wetting.

MeSH terms

Carbon
Humans
Multimedia
Neonicotinoids
Oryza*
Soil*
Thiazines*
Water

Substances

thiacloprid
Soil
Carbon
Water
Neonicotinoids
Thiazines