Process-based modeling of tree-ring formation and its relationships with climate on the Tibetan Plateau |
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| Affiliation: | 1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China;2. Mathematical Methods and Information Technology Department, Siberian Federal University, L. Prushinskoi street, 2, Krasnoyarsk, 660075, Russia;3. V.N Sukachev Institute of Forest SB RAS, Laboratory of Tree-Ring Structure, 660036 Krasnoyarsk, Russia;4. Institute of Geography, University of Erlangen-Nürnberg, 91054 Erlangen, Germany;1. Department of Wood and Paper Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran;2. Institute of Geography, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany;1. Forest Ecology and Forest Management, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands;2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;3. Laboratory of Tree-Ring Research, University of Arizona, 1215 E Lowell Street, Tucson, AZ 85721, USA;1. Institute of Desert Meteorology, China Meteorological Administration, Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration, Key Laboratory of Tree-ring Ecology of Xinjiang Uigur Autonomous Region, Urumqi 830002, China;2. Key Laboratory of Western China''s Environmental Systems(Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China;3. Xinjiang Agro-Meteorological Observatory, Urumqi 830002, China);1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 73000, China;2. University of Chinese Academy of Sciences, Beijing, 10048, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China;4. Dongdashan Natural Reserve, Ganzhou District, Zhangye, 734000, China;1. State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Forest College of Inner Mongolia Agricultural University, Hohhot 010018, China;5. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China |
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| Abstract: | Response of climate warming on tree-ring formation has attracted much attention during recent years. However, most studies are based on statistical analysis, lacking understanding of tree-physiological processes, especially in the mountainous regions of the Tibetan Plateau (TP). Herein, we firstly use an updated new version of the tree-ring process-based Vaganov-Shashkin model (VS-oscilloscope) to simulate tree-ring formation and its relationships with climate factors during the past six decades. Our analyses covered 341 sampled trees growing within elevations ranging from 2750 to 4575 m a.s.l. at five sampling sites across the TP. Simulated tree-ring width series are significantly (p < 0.01) correlated with actual tree-ring width chronologies during their common interval periods. Starting dates of tree-ring formation are determined by temperature at all five sampling sites. After the initiation of tree stem cambial activity, soil moisture content has a significant effect on tree radial growth. Ending dates of cambial activity are driven by temperature over the whole study region. Simulated results indicate differences between wide and narrow tree-rings are mostly induced by soil moisture content, especially during the first half of the growing season, when effects from temperature variations are minor. Interestingly, we detected significantly (p < 0.001) increased relative growth rates due to higher soil moisture content after the year 1985 at the five sampling sites. However, the variability of mean relative growth rates due to temperature is negligible before and after that. Based on the successful application of VS-oscilloscope modeling on the high-elevation tree stands on the TP, our study provides a new perspective on tree radial growth process and their varying relationships to climate factors during the past six decades. |
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| Keywords: | Tree-ring formation Soil moisture content Temperature Process-based modeling VS-oscilloscope Tibetan Plateau |
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