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| Ecological effects of di(2-ethylhexyl) phthalate on soil microorganisms |
| Received:December 24, 2015 |
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| KeyWord:di(2-ethylhexyl) phthalate (DEHP);soil respiration;soil enzyme;microbial biomass;ecological effect |
| Author Name | Affiliation | E-mail | | XIA Qing-bing | College of Resource and Environment, Shandong Agricultural University, Key Laboratory of Agricultural Environment in Universities of Shandong, Tai忆an 271018, China | | | WANG Jun | College of Resource and Environment, Shandong Agricultural University, Key Laboratory of Agricultural Environment in Universities of Shandong, Tai忆an 271018, China | lushzhu@sdau.edu.cn | | ZHU Lu-sheng | College of Resource and Environment, Shandong Agricultural University, Key Laboratory of Agricultural Environment in Universities of Shandong, Tai忆an 271018, China | | | WANG Jin-hua | College of Resource and Environment, Shandong Agricultural University, Key Laboratory of Agricultural Environment in Universities of Shandong, Tai忆an 271018, China | | | LIU Wen-jun | College of Resource and Environment, Shandong Agricultural University, Key Laboratory of Agricultural Environment in Universities of Shandong, Tai忆an 271018, China | |
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| Abstract: |
| Pollution by phthalic acid esters (PAEs) is becoming more and more serious in the soil environment. Here, a laboratory experiment was performed to evaluate the ecological toxicological effects of di(2-ethylhexyl) phthalate (DEHP), a typical phthalate, on some soil enzymes (urease, catalase, and dehydrogenase), respiration, and microbial biomass in soil under different DEHP rates (0, 0.1, 1, 10 mg and 50 mg DEHP per kg soil) on the 7th, 14th, 21st, and 28th day after treatments with DEHP. Results showed that soil catalase activity was significantly inhibited and decreased by 25.0%~14.3% compared with the control on the 7th day. Soil dehydrogenase activity decreased by 86.3%~31.7% at 0.1~10 mg·kg-1 treatments but increased by 105% at 50 mg·kg-1. However, DEHP suppressed soil urease activity more during later period than during early period. Furthermore, soil urease activity significantly decreased over time, which may relate to nitrogen contents in soil. With DEHP increasing, soil respiration and soil microbial biomass carbon and biomass nitrogen increased, but decreased at higher rates. Compared with the control, however, they were all stimulated, whereas these parameters decreased over time. In conclusion, DEHP has significant ecological effects on soil microbes. |
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