Tao Kelin, Tian Haixia, Wang Ziquan, Shang Xiaofu, Fan Jing, Megharaj Mallavarapu, Ma Jianli, Jia Hanzhong, He Wenxiang
College of Natural Resources and Environment, Northwest A&F University, Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, China.
Tianjin Huankelijia Environmental Remediation Technology Co., Ltd., Tianjin, 300191, China.
Chemosphere. 2023 Jan;311(Pt 2):137116. doi: 10.1016/j.chemosphere.2022.137116. Epub 2022 Nov 2.
The application of parathion (PTH) in agriculture can result in its entry into the soil and threaten the soil environment. Monitoring the PTH residues and assessing toxicity on soil health are of paramount importance to the public. Herein, the dissipation of PTH and concomitant influence on microbial activities [FDA hydrolase (FDA‒H), microbial biomass carbon (MBC) and basal respiration (BR)] in coastal solonchaks were investigated. Results showed that the dissipation of PTH in tested soil declined linearly, and the half-lives varied from 5.6 to 56.8 days, depending on pollutant concentrations. The FDA‒H activity and MBC were negatively affected by PTH pollution and exhibited a significantly positive correlation. Two‒way ANOVA analysis demonstrated that microbial activities were affected not only by PTH dose and incubation time but also by their interactions. The integrated biomarker response (IBR/n) index values on day 120 were between 1.02 and 2.89, larger than those on day 1 during PTH dissipation. This implied that the soil quality did not recover though there was no PTH residue in the soil at the end of the experiment. These findings suggested that microbial activities integrated with IBR/n index could elucidate the hazardous impacts of PTH dissipation on biochemical cycling and microorganisms in soil.
对硫磷（PTH）在农业中的应用会导致其进入土壤并威胁土壤环境。监测PTH残留并评估其对土壤健康的毒性对公众至关重要。在此，研究了沿海盐土中PTH的消散及其对微生物活性[FDA水解酶（FDA-H）、微生物量碳（MBC）和基础呼吸（BR）]的伴随影响。结果表明，受试土壤中PTH的消散呈线性下降，半衰期从5.6天到56.8天不等，这取决于污染物浓度。FDA-H活性和MBC受到PTH污染的负面影响，且呈现出显著的正相关。双向方差分析表明，微生物活性不仅受到PTH剂量和培养时间的影响，还受到它们之间相互作用的影响。在第120天的综合生物标志物响应（IBR/n）指数值在1.02至2.89之间，大于PTH消散过程中第1天的值。这意味着尽管在实验结束时土壤中没有PTH残留，但土壤质量并未恢复。这些发现表明，结合IBR/n指数的微生物活性可以阐明PTH消散对土壤生化循环和微生物的有害影响。
