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| Effects of Exogenetic Oxytetracycline and Sulfamethazine on Soil Labile Organic Carbon Contents |
| Received:September 03, 2014 |
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| KeyWord:antibiotics;soil pollution;microbial biomass carbon;water soluble organic carbon;readily oxidized carbon;dissolved organic carbon |
| Author Name | Affiliation | E-mail | | LING De | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | LI Ting | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | lt_sicau@163.com | | ZHANG Shi-rong | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | LI Yun | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | JIA Yong-xia | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | XU Xiao-xun | College of Resource and Environment, Sichuan Agricultural University, Chengdu 611130, China | |
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| Abstract: |
| Long-term applications of livestock excreta could lead to antibiotic accumulation in soils, thus affecting the ecological environment. In order to understand the impact of antibiotics on soil environment, a pot experiment was conducted to examine the effects of oxytetracycline(OTC) and sulfamethazine(SMZ) at different concentrations on soil microbial biomass carbon(MBC), water soluble organic carbon(WSOC), readily oxidized carbon(ROC) and dissolved organic carbon(DOC). Four types of labile organic carbons were sensitive to antibiotics as follows:WSCO > MBC > DOC > ROC. The contents of WSOC and DOC increased with increasing rates of OTC and SMZ. Applying OTC and SMZ led to a greatest increase of 137.1% and 251.8% for WSOC, and 31.9% and 10.7% for DOC, respectively. However, OTC and SMZ additions decreased soil MBC and ROC, with the largest reduction of 47.8% and 52.4% for MBC, and 4.9% and 7.4% for ROC, respectively. The soil could self-restore when OTC and SMZ were less than 50 mg·kg-1 and 10 mg·kg-1, respectively. However, the soil showed mild pollution at end of the experiment when exposed to 100~200 mg·kg-1 OTC and 50~100 mg·kg-1 SMZ, respectively, thus possessing environmental risk. |
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