Tree ring anatomy indices of Pinus tabuliformis revealed the shifted dominant climate factor influencing potential hydraulic function in western Qinling Mountains |
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| Institution: | 1. School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China;2. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;3. Plant Ecophysiology and Evolution Group, State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning, Guangxi 530004, China;4. Qinling National Botanical Garden, Xi’an 710061, China;5. Xi’an Botanical Garden of Shaanxi Province (Institute of Botany of Shaanxi Province), Xi’an 710061, China;1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China;2. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;3. College of Forestry, Northeast Forestry University, Harbin 150040, China;1. Key Laboratory of Humid Subtropical Eco-geographical Process (Ministry of Education), Fujian Normal University, Fuzhou, 350007, China;2. College of Geography and Tourism, Huanggang Normal University, Huanggang, 438000, China;3. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460 S-405 30, Gothenburg, Sweden;4. Swiss Federal Institute for Forest Snow and Landscape Research WSL, Birmensdorf, Switzerland;5. Faculty of Environment and Resource Studies, Mahidol University, 999 Phutthamonthon Rd4, Salaya, Phutthamonthon, Nakhon Pathom, 73170, Thailand;6. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;7. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;8. University of Chinese Academy of Sciences, Beijing, China;1. Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, E-28933, Móstoles, Spain;2. Unidad de Postgrado, Facultad de Ciencias Exactas y Tecnología, Universidad Autónoma Gabriel René Moreno, Campus Universitario, Santa Cruz de la Sierra, Bolivia;3. Universidad Pedagógica y Tecnológica de Colombia, Sede Tunja, 150003, Tunja, Colombia;4. Museo de Historia Natural “Noel Kempff Mercado”, Avda. Irala 565, 2489, Santa Cruz de la Sierra, Bolivia;5. Instituto Pirenaico de Ecología (IPE-CSIC), Avda. Montañana 1005, E-50192, Zaragoza, Spain;1. WASCAL Graduate Research Program on Climate Change and Biodiversity, University Félix Houphoüet Boigny, B.P. 165 Abidjan 31, Côte d’Ivoire;2. University Joseph KI-ZERBO, Laboratory of Plant Biology and Ecology, 03 B.P. 7021 Ouagadougou 03, Burkina Faso;3. World Agroforestry Center, 30677 Nairobi, Kenya;4. Friedrich-Alexander-University of Erlangen-Nürnberg (FAU), Institute of Geography, 91058 Erlangen, Germany;1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China;2. University of Chinese Academy of Sciences, Beijing, 100085, China;3. School of Geography and Tourism, Shaanxi Normal University, Xi’an, 710119, China;1. Laboratory of Applied Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, 01 BP 526 Cotonou, Benin;2. World Agroforestry (ICRAF), P.O. Box 30677–00100, Nairobi, Kenya;3. Institute of Geography, Friedrich-Alexander University Erlangen-Nürnberg, Wetterkreuz 15, 91058 Erlangen, Germany;4. UFR Sciences de la Nature, Université Nangui Abrogoua, 02 BP 801 Abidjan, Côte d′Ivoire;5. Centre Suisse de Recherches Scientifiques en Côte d′Ivoire, 01 BP 1303 Abidjan, Côte d′Ivoire |
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| Abstract: | Trees can adjust xylem anatomical structure related with potential hydraulic functions to cope with climate variability. We therefore need a better understanding of how climate variability constrains wood anatomy and tree radial growth. Pinus tabuliformis dominates natural forests and plantations over the western Qinling Mountains, which is one of the ecologically vulnerable areas in China. Here, we investigated the response of P. tabuliformis tree-ring anatomical structure to climate variability by applying wood anatomy analysis, and evaluated the influences of anatomical traits on potential hydraulic functions and the climate significance of intra-annual density fluctuations (IADFs). We found that with the increasing temperature from spring to summer, the negative effect of temperature on the formation and enlargement of earlywood and transition-wood tracheids was gradually enhanced. However, spring precipitation not only had a direct and positive influence on the formation of earlywood, but also had a delaying impact on the transition-wood cell enlargement. Besides, the smaller earlywood tracheid size of P. tabuliformis could be a substantially characteristic reflecting spring drought. The contribution of lumen diameter on conduit wall reinforcement was dominated in earlywood, while the contribution of cell wall thickness was greater than that of lumen diameter in latewood. The different contributions of anatomical traits on conduit wall reinforcement would further affect the response of potential hydraulic function to climate. IADFs of P. tabuliformis could be a potential indicator to reflect the abnormal summer precipitation events in the western Qinling Mountains. IADFs with strong and weak intensity indicated years with high and low rates of change in mid-summer precipitation, respectively. Future warmer and drier climate in the western Qinling Mountains will likely result in the production of smaller tracheids to ensure hydraulic safety, which means the stronger drought resistant of P. tabuliformis in the future. In this study, we linked the xylem anatomy and potential hydraulics functions with intra-seasonal climate variability in the context of climate warming and drying, and proposed some xylem anatomical indices reflecting potential drought events. |
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| Keywords: | Climate change Tree ring Quantitative xylem anatomy Intra-annual density fluctuation |
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