Citation: | LI Jingfang, HU Xiaolei, CHEN Liang. Study on the natural attenuation mechanism of gibberellic acid in soil under different water content conditions[J]. Hydrogeology & Engineering Geology, 2024, 51(2): 50-57. doi: 10.16030/j.cnki.issn.1000-3665.202310046 |
As a micro-toxic pesticide with a wide application range and large dosage, the high solubility of gibberellic acid (GA3) causes its weak adsorption and strong migration in soil, accompanied by strong natural attenuation, and it is also affected by changing soil water content during intermittent irrigation. Therefore, it is necessary to systematically study the natural attenuation mechanism of GA3 in soil under different water content conditions. In this study, the natural attenuation mechanism of GA3 under different soil water content conditions was investigated by setting three soil water contents of 10%, 20% and 30%, the influence of soil microorganisms on the natural attenuation process of GA3 was analyzed, and the natural attenuation products were qualitatively identified. The results show: (1) at the end of the experiment (34 d), the natural attenuation rates of GA3 in the soil of the sterilized group and the unsterilized group with initial water content of 10%, 20% and 30% were 87.77%, 89.70%, 90.70% and 87.70%, 94.47%, 95.87%, respectively, and the natural attenuation half-lives were 12.38 d, 12.16 d, 12.60 d and 8.56 d, 6.80 d, 7.07 d, respectively. (2) Soil water content had no significant effect on the natural attenuation rate of GA3 in the soil of the sterilized group, while the natural attenuation rate of GA3 in the unsterilized group was different under different soil water content (the largest in the 20% soil water content). (3) On the basis of hydrolysis, biodegradation further promoted the natural degradation of GA3, with a biodegradation contribution rate of 39.62%±7.58%. (4) The main natural attenuation products of GA3 were isomerized gibberellic acid (Iso-GA3) and gibberellenic acid (GEA) (of which Iso-GA3 accounted for a larger proportion). The more attention should be paid to the biotoxicity and environmental risks of the natural attenuation products of GA3 in the environment in the future. This study can help to understand the environmental behavior of GA3 in agricultural soils and provide data support for the assessment and control of its environmental toxicity and potential risk.
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Variation of soil water content with time in sterilized and unsterilized groups
Natural attenuation of GA3 in the soil of sterilization group under different soil water contents
HPLC spectra of total GA3 and its natural attenuation products in the experimental process
Natural attenuation of GA3 in the soil of each treatment group under different soil water contents