The role of ammonium oxidizing communities in mediating effects of an invasive plant on soil nitrification |
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| Institution: | 1. Department of Biology, Indiana University, 1001 East Third Street, Bloomington, IN, USA;2. Agronomy Department, University of Florida, Gainesville, FL, USA;3. Department of Natural Resources and Environmental Science, University of Illinois, Urbana-Champaign, IL, USA;1. College of Life Science, Hebei University, Baoding, Hebei, 071002, China;2. College of Plant Protection, Hunan Agricultural University, Changsha, Hunan, 410128, China;3. Department of Environmental Studies, Centre for Environmental Management of Degraded Ecosystems (CEMDE), University of Delhi, Delhi 110007, India;4. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100081, China;5. Institute of Plant Protection, Chinese Academy of Sciences, Beijing, 10081, China;1. University of Potsdam, Institute for Biochemistry and Biology, Biodiversity Research/Systematic Botany, Maulbeerallee 1, 14469 Potsdam, Germany;2. Freie Universität Berlin, Institute for Biology, Dahlem Centre of Plant Science (DCPS), Altensteinstr. 6, 14195 Berlin, Germany;3. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Altensteinstr. 6, 14195 Berlin, Germany;1. Fort Lauderdale Research and Education Center, University of Florida, IFAS, 3205 College Ave., Fort Lauderdale, FL 33314, USA;2. BioFrontiers, University of Colorado, 3415 Colorado Ave., Boulder, CO 80303, USA;3. United States Department of Agriculture/ARS Australian Biological Control Laboratory, The Commonwealth Scientific and Industrial Research Organisation, Entomology, 41 Boggo Road, Dutton Park, Queensland 4102, Australia;1. Key Laboratory of Biodiversity Dynamics and Conservation of Guangdong Higher Education Institutes, and Guangdong Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China;2. Guangdong Neilingding Futian National Nature Reserve, Shenzhen 518000, China;3. College of Life Sciences, Shenzhen University, Shenzhen 518060, China;4. Futian-CityU Mangrove Research and Development Centre, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region;5. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region;6. Shenzhen Wild Animal Rescue Center, Xinzhou Road, Shenzhen 518040, China;1. Universidad de Buenos Aires, Facultad de Agronomía, Departamento de Recursos Naturales y Ambiente, Catedra de Ecología, Buenos Aires, Argentina;2. CONICET – Universidad de Buenos Aires, Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA), Buenos Aires, Argentina;3. Universidad de Buenos Aires, Facultad de Agronomía, Departamento de Métodos Cuantitativos y Sistemas de Información, Buenos Aires, Argentina |
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| Abstract: | Invasive plants often benefit from changes that they impose on soil microbes via positive plant–soil feedback, but the mechanisms that underlie these changes, and the legacy of their effects, remain poorly quantified. We investigated the impacts of an invasive annual grass, Microstegium vimineum, on the structure and functioning of soil microbial communities in a multi-year, field-based common garden experiment. Given previous reports that M. vimineum can both elevate nitrification rates in soil and benefit from enhanced nitrate availability, we sought to answer the following questions: 1) Does M. vimineum alter the abundance or composition of soil nitrifying microbial communities (ammonia oxidizing archaea and bacteria, AOA and AOB, respectively)? 2) Are such effects reversible or do soil legacy effects persist after M. vimineum is no longer present? After three years, invaded plots had greater AOA abundances than uninvaded native dominated plots, as well as different AOA community structure. However, after seven years, and following a period of M. vimineum replacement by native plants in the invaded plots, AOA abundances and nitrification rates declined toward levels found in uninvaded plots. Collectively, our results suggest that while the impacts of M. vimineum invasions on nitrogen cycling likely relate to their association with AOA, these effects may not persist if M. vimineum declines over time and native plants and their associated microbes are able to re-establish. |
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| Keywords: | Ammonia-oxidizing bacteria Ammonia-oxidizing archaea Nitrification Invasion decline |
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