A meta-analysis of the effects of experimental warming on soil carbon and nitrogen dynamics on the Tibetan Plateau |
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| Institution: | 1. Key Laboratory of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA;4. Center for Earth System Science, Tsinghua University, Beijing 100084, China;5. Center for Global Change and Ecological Forecasting, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;6. Synthesis Research Center of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;7. Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China;1. Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China;3. CAS Center for Excellence in Tibetan Plateau Earth Science of the Chinese Academy of Sciences, Beijing 100101, China;4. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83 Umeå, Sweden;5. College of Life Sciences and Biological Technology, University of Chinese Academy of Sciences, Beijing 100049, China;6. School of Environment, Natural Resources and Geography, Bangor University, Gwynedd LL57 2UW, UK;1. Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, 86011, USA;2. Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA;1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;2. The Key Laboratory of Agricultural Environment and Climate Change, Chinese Academy of Agricultural Sciences, Beijing 100081, China;3. Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining 810008, China;1. Department of Earth System Science, University of California, Irvine, CA 92697-3100, USA;2. Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany;3. Department of Earth, Atmospheric & Planetary Sciences and the Purdue Climate Change Research Center, Purdue University, West Lafayette, IN, USA;4. School of Agricultural, Forest and Environmental Sciences, Clemson University, Clemson, South Carolina, USA |
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| Abstract: | Alpine ecosystems at high altitudes and latitudes are notably sensitive to climatic warming and the Tibetan Plateau is a widely distributed alpine ecosystem. The magnitude of climatic warming on the Tibetan Plateau is expected to be considerably greater than the global average. However, a synthesis of the experimental warming soil carbon and nitrogen data is still lacking and whether forest soils are more sensitive to warming than grassland soils remains unclear. In this study, we used a meta-analysis approach to synthesise 196 observations from 25 published studies on the Tibetan Plateau. Warming significantly increased microbial biomass carbon (MBC) by 14.3% (95% CI: 2.9–24.6%), microbial biomass nitrogen (MBN) by 20.1% (95% CI: 2.0–45.1%), net nitrogen mineralization by 49.2% (95% CI: 38.1–62.3%) and net nitrification by 56.0% (95% CI: 51.4–66.1%), but did not significantly affect soil carbon (95% CI: −13.9 to 2.7%) or nitrogen (95% CI: −12.4 to 2.6%). The mean annual air temperature was negatively correlated with the warming effects on MBC and MBN. Grasslands exhibited significant MBC and MBN responses to warming. Specifically, soil microbial biomass was more responsive to warming in colder environments. Moreover, forest soils are not always more sensitive to warming than grassland soils as previous studies have suggested. These findings indicate that clarifying the effect of warming on alpine soils need consider ecosystem types and their local climate. |
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| Keywords: | Global warming Increased temperature Microbial biomass Response ratio |
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