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Effects of pig manure containing copper and zinc on microbial community assessed via phospholipids in soils |
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| Authors: | Yan Zhang Wei Luo Junmei Jia Peiru Kong Xiaojuan Tong Yonglong Lu Liqiong Xie Fulong Ma John P Giesy |
| Institution: | 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China 2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China 3. University of Chinese Academy of Science, Beijing, 100049, China 4. College of Forestry, Beijing Forestry University, Beijing, 100083, China 5. Department of Veterinary Biomedical Sciences and Toxicology Center, University of Saskatchewan, Saskatoon, SK, Canada 6. Department of Zoology, National Food Safety and Toxicology Center and Center for Integrative Toxicology, Michigan State University, East Lansing, MI, 48824, USA |
| Abstract: | Pig manure (PM) is widely used as an organic fertilizer to increase yields of crops. Excessive application of compost containing relatively great concentrations of copper (Cu) and zinc (Zn) can change soil quality. To clarify the effects of different rates of application and to determine the optimal rate of fertilization, PM containing 1,115 mg Cu kg?1, dry mass (dm) and 1,497 mg Zn kg?1, dm was applied to alkaline soil at rates of 0, 11, 22, 44, 88, and 222 g PM kg?1, dm. Phospholipid fatty acids (PLFAs) were used to assess soil microbial community composition. Application of PM resulted in greater concentrations of total nitrogen (TN), NH4 +-N, NO3 ?-N, total carbon (TC), soil organic matter (SOM) but lesser pH values. Soils with application rates of 88–222 g PM kg?1, dm had concentrations of total and EDTA-extractable Cu and Zn significantly greater than those in soil without PM, and concentrations of T-Cu and T-Zn in these amended soils exceeded maximum limits set by standards in china. Except in the soil with a rate of 11 g PM kg?1, dm, total bacterial and fungal PLFAs were directly proportional to rate of application of PM. Biomasses of bacteria and fungi were significantly greater in soils with application rates of 44–222 g PM kg?1, dm than in the soil without PM. SOM, TC and EDTA-Zn had the most direct influence on soil microbial communities. To improve fertility of soils and maintain quality of soil, rate of application should be 22–44 g PM kg?1 dm, soil containing Cu and Zn. |
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