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| Impact of haloxyfop-R-methyl on microbial respiration and enzyme activities in fluvio-aquic soil |
| Received:September 20, 2020 |
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| KeyWord:haloxyfop-R-methyl;soil microbial respiration;sucrase;urease;catalase;alkaline phosphatase |
| Author Name | Affiliation | | CHENG Ya-nan | School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453000, China | | WANG Zhen-dong | School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453000, China | | REN Xiu-juan | School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453000, China | | GUO Yan-ling | School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453000, China | | LIU Gen-yuan | School of Resources and Environment, Henan Institute of Science and Technology, Xinxiang 453000, China |
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| Abstract: |
| To evaluate the toxicological effects of haloxyfop-R-methyl on soil microbial ecosystem, a laboratory incubation experiment was conducted to investigate the responses of soil microbial respiration and enzymatic activities to haloxyfop-R-methyl. Six treatments were included:(1) control (CK);(2) 0.01 mg·kg-1(T1);(3) 0.04 mg·kg-1(T2);(4) 0.08 mg·kg-1(T3);(5) 0.16 mg·kg-1(T4); and (6) 0.40 mg·kg-1(T5). Results showed that soil microbial respiration was significantly enhanced by T1 treatment during the experimental process. However, T2 and T3 treatments significantly inhibited soil microbial respiration on the 7th and 14th day of culture. Soil microbial respiration in T4 treatment was first inhibited on the 7th day, and then activated, while soil microbial respiration in T5 treatment was basically consistent with that in the control within the first 14 days of incubation. Sucrase activity was significantly inhibited by haloxyfopR-methyl and significantly and negatively correlated with the concentration of haloxyfop-R-methyl. Sucrase activity in T1 treatment returned to that in the control level on the 35th day; however, the inhibition effect was stronger under the condition of higher haloxyfop-Rmethyl concentration. Soil urease activity was significantly activated by haloxyfop-R-methyl. Soil urease activity was gradually enhanced by increasing the concentration of haloxyfop-R-methyl except in T5 treatment, which soil urease activity was similar to that in the control group on the 7th, 21st, and 28th day. The activities of soil catalase and alkaline phosphatase were significantly inhibited on the 14th day of incubation; however, the activities of the two enzymes were initially inhibited at T3 concentration of haloxyfop-R-methyl on the 7th day. Catalase activity was inhibited only when the concentration of haloxyfop-R-methyl reached that of T4, and alkaline phosphatase activity returned to that in the control level when the concentration reached that of T3 on the 21st day. Therefore, sucrase and urease activities were significantly inhibited and activated, respectively under the condition of high haloxyfop-R-methyl concentration, characterizing the pollution degree of haloxyfop-R-methyl. Moreover, the activities of soil catalase and alkaline phosphatase basically recovered to that of the control level on the 21st day, showing strong tolerance to the presence of haloxyfop-R-methyl. |
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