Labile,recalcitrant, microbial carbon and nitrogen and the microbial community composition at two Abies faxoniana forest elevations under elevated temperatures |
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| Institution: | 1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;2. School of Life Sciences, Southwest University of Science and Technology, Mianyang 621010, China;3. Department of Forest Sciences, PL 27, 00014 University of Helsinki, Finland;4. Mianyang Normal University, Mianyang 621010, China;1. Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States;2. Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States;3. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States;1. College of Resources and Environmental Sciences, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, China;2. Tibet Agricultural and Animal Husbandry College, Tibet University, Linzhi 860000, China;1. Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, 73019, USA;2. ECOSS and 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. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing 100101 (China);2. University of Chinese Academy of Sciences, Beijing 100049 (China);3. Center for Remote Sensing and Spatial Analysis, Department of Ecology, Evolution and Natural Resources, Rutgers University, 14 College Farm Road, New Brunswick NJ 08901 (USA);4. Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021 (China);5. Key Laboratory of Plant Stress Biology, College of Life Sciences, Henan University, Kaifeng 475004 (China);1. Graduate Program in Organismic and Evolutionary Biology, 204C French Hall, University of Massachusetts Amherst, 230 Stockbridge Road, Amherst, MA 01003, United States;2. Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH 03824, United States;3. The Ecosystems Center, 7 MBL Street, Woods Hole, MA 02543, United States;4. Department of Microbiology, 418 Morrill Science Center IVN, University of Massachusetts Amherst, 639 North Pleasant Street, Amherst, MA 01003, United States |
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| Abstract: | We investigated the interactions of altitude and artificial warming on the soil microbial community structure in a subalpine Abies faxoniana forest in southwestern China after four years of warming. Open top chambers (OTCs) at two elevations (3000 m and 3500 m) were established, and their soil microbial characteristics, organic carbon (C) and nitrogen (N) were measured. The microbial community structure was quantified by phospholipid fatty acid (PLFA) analysis. A two-step sulfuric acid hydrolysis was used to quantify the labile and recalcitrant C fractions in the soil organic matter. The results showed that bacterial PLFAs and gram-negative bacterial PLFAs increased and the fungal PLFAs and the fungi/bacteria ratio decreased with warming at the high altitude. By contrast, the warming effects on those parameters at low altitude were small. The higher proportion of labile easily decomposable soil C may explain the different responses of the microbial community composition at the two altitudes. An RDA analysis confirmed that the variations in the soil community structure were significantly associated with soil organic matter properties such as the sizes of the soil labile N pool (LP-N), the recalcitrant N pool (RP-N), and the labile C pool as well as dissolved organic C (DOC) and dissolved organic N concentrations (DON). Our results also showed that labile C and N pools increased with the altitude, but the microbial biomass C as measured with chloroform fumigation techniques decreased. Warming increased only the recalcitrant C pools at the high altitude. Given the longer mean residence time for recalcitrant C and the much greater size of this soil organic carbon pool, the results indicated that a rise in temperature in our case increased soil C pools at higher altitudes, at least during the early stages of experimental soil warming. Warming could also cause changes in the composition of the microbial community and enzyme activities, consequently leading to functional changes in soil ecosystem processes at the high altitude. |
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| Keywords: | Altitude Microbial biomass Open top chamber Phospholipid fatty acid Soil organic matter |
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