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| Effects of fulvic acid on degradation of DnBP and Microbial activity in soil |
| Received:August 09, 2019 |
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| KeyWord:phthalic acid esters;fulvic;soil basal respiration;soil enzyme activity |
| Author Name | Affiliation | E-mail | | LIU Si-yao | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China | | | LI Yu-shuang | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China
Laboratory of Ecological Environment and Information Atlas(Putian University) Fujian Provincial University, School of Environmental and Biological Engineering, Putian University, Putian 351100, China | ysli_syu@163.com | | HOU Yong-xia | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China | | | SONG Xue-ying | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China | | | XU Shuo | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China | | | WEI Jian-bing | Laboratory of Regional Pollution Environment and Ecological Rehabilitation, Ministry of Education, School of Environment, Shenyang University, Shenyang 110044, China | | | ZHAO Xiao-xu | Laboratory of Ecological Environment and Information Atlas(Putian University) Fujian Provincial University, School of Environmental and Biological Engineering, Putian University, Putian 351100, China | |
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| Abstract: |
| Phthalic acid esters commonly exist in agricultural soils in China and it has been determined that the soil is seriously polluted by the high levels of DnBP. Fulvic acid(FA)is a type of dissolved organic matter, which is an important component of soil humus and has a crucial effect on the environmental fate of organic pollutants in the soil. This research was conducted to determine the effects of FA on the degradation of DnBP and soil microbial activity using the mean values from soil culture experiments. The results showed that the addition of FA to the soil shortened the half-life of DnBP during its degradation. The half-life period of DnBP in the FA treatment group was 0.481~0.677 times longer than that in the control treatment. FA promoted the basic basal respiration of soil, whereas the 40 mg·g-1 treatment group with FA had the strongest promotion effect on soil respiration, which could release CO2 up to 40.87 times that of the blank control group. Catalase activity exhibited an increasing trend with the low FA concentration(10~20 mg·g-1)and decreasing in the high FA concentration(40~160 mg·g-1). FA exhibited an active effect on soil dehydrogenase activity and the 40~160 mg·g-1 significantly promoted soil dehydrogenase activity. The correlation analysis results showed that the dosage of FA used in soil was positively correlated with the degradation rate of DnBP; however, it was negatively correlated with catalase activity. It was also positively correlated with the intensity of soil respiration and dehydrogenase activity. The path analysis showed that the FA dosage used in the soil strongly affected the direct degradation rate of DnBP in the soil with an indirect effect on the intensity of soil respiration and soil enzymes. Thus, FA affectes the degradation of DnBP. |
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