Influence of balsam poplar tannin fractions on carbon and nitrogen dynamics in Alaskan taiga floodplain soils |
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| Institution: | 1. Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106, USA;2. Chemical Ecology Laboratory, Brigham Young University, Provo, UT 84602, USA;1. University of Padova, Department of Land, Environment, Agriculture and Forestry, Viale dell’Università 16, 35020 Legnaro, PD, Italy;2. University of Padova, Department of Agronomy, Food, Natural Resources Animals and Environment (DAFNAE), Viale dell''Università, 16, 35020 Legnaro, PD, Italy;3. Centre of New Technologies, University of Warsaw, S. Banacha 2c, 02-097 Warsaw, Poland;1. Yale School of the Environment, Yale University, 195 Prospect St., New Haven, CT, 06511, USA;2. The Nature Conservancy, Arlington, VA, USA;3. Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, 80307, USA;4. Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, 80309, USA;1. Plateforme TFFFC, Université de Toulouse, INP-PURPAN, Toulouse, France;2. Laboratoire de Chimie Agro-industrielle, LCA, Université de Toulouse, INRAE, Toulouse, France;3. SPO, INRAE, Univ Montpellier, Institut Agro, Montpellier, France;4. INRAE, PROBE Research Infrastructure, Polyphenol Analytical Facility, Montpellier, France;5. INRAE, UE999 Pech-Rouge, Gruissan, France;1. MOE Key Laboratory of Wooden Material Science and Application & Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing, 100083, China;2. Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Longpan Road 159, Xuanwu District, Nanjing, 210037, China;3. Mechanical Engineering, University of North Texas, Denton, TX, 76203, USA;4. Dehua TB Decoration New Material Co., Ltd., Huzhou, Zhejiang, 313200, China;1. Institute of Soil Science and Land Evaluation, Soil Biology Department, University of Hohenheim, Emil-Wolff-Str. 27, 70599 Stuttgart, Germany;2. School of Environment and Natural Resources, The Ohio State University, 210 Kottman Hall, 2021 Coffey Rd., Columbus, OH 43210, United States;3. Institute of Soil Science and Land Evaluation, Biogeophysics Department, University of Hohenheim, Emil-Wolff-Str. 27, 70599 Stuttgart, Germany;4. Environmental Science Research Institute, Shahid Beheshti University, G.C., Tehran, Iran;5. Institute of Agricultural Sciences in the Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, Garbenstr. 13, 70599 Stuttgart, Germany;1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Department of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China;4. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | The feedbacks between plant and soil processes play an important role in driving forest succession. One poorly understood feedback mechanism is the interaction between plant secondary chemicals and soil microbes. In the Alaskan taiga, changes in nutrient cycling caused by balsam poplar (Populus balsamifera) secondary chemicals may affect the transition from alder (Alnus tenuifolia) to balsam poplar on river floodplains. We examined the effects of four poplar condensed tannin fractions on N cycling in alder and poplar soils. Tannins were added to forest floor samples from both poplar and alder sites. Samples were incubated for 1 month in the laboratory with soil respiration rates measured over the course of the incubation. At the end of the incubation we measured both net and gross nitrogen mineralization and nitrification, microbial biomass C and N, and the activity of various exoenzymes. In all soils, tannin additions reduced N availability, however, the mechanisms differed depending on the molecular weight of the tannin and the native soil microbial community. Low molecular weight tannin fractions served as a labile C source in poplar Oi, poplar Oe, and alder Oe horizons but were toxic to microbes in alder Oi. High molecular weight tannin fractions appeared to act primarily by binding extracellular substrates and thus limiting C and N mineralization, with the strongest effects observed in the alder soils. |
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