Recent decline of high altitude coniferous growth due to thermo-hydraulic constrains: evidence from the Miyaluo Forest Reserve,Western Sichuan Plateau of China |
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| Institution: | 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China;2. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;3. College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China;4. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;5. College of Forestry, Northeast Forestry University, Harbin 150040, China;1. Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China;2. Key Laboratory of Land Consolidation and Rehabilitation, Land Consolidation and Rehabilitation Center, Ministry of Natural Resources, Beijing, 100035, China;3. State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China;4. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China;5. Department of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts Amherst, Amherst, MA, 01003, USA;1. Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;2. College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;3. School of GeoScience, University of Edinburgh, Edinburgh, UK;1. CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Sand Fixation and Silviculture, Fuxin 123000, Liaoning, China;4. National Climate Centre, China Meteorological Administration, Beijing 100081, China;1. Institute of Desert Meteorology, China Meteorological Administration, Urumqi, 830002, China;2. Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration, Urumqi, 830002, China;3. Key Laboratory of Tree-ring Ecology of Uigur Autonomous Region, Urumqi, 830002, China;4. Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, 710061, China;1. Center for Ecological Research, Northeast Forestry University, Harbin 150040, China;2. Key Laboratory of Sustainable Forest Ecosystem Management, Ministry of Education, School of Forestry, Northeast Forestry University, Harbin 150040, China;3. Key Laboratory of Forest Ecology and Environment, State Forestry Administration, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;4. State Key Laboratory of Urbanand Regional Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China;5. Heilongjiang Institute of Meteorological Science, Harbin 150030, China;1. Key Laboratory of Alpine Ecology and Biodiversity, Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. Slovenian Forestry Institute, Department of Yield and Silviculture, Vecna pot 2, SI-1000 Ljubljana, Slovenia;4. University of Quebec in Chicoutimi, Département des Sciences Fondamentales, 555, Boulevard de l’Université, Chicoutimi (QC) G7H2B1, Canada;5. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;6. University of Ljubljana, Biotechnical Faculty, Department of Wood Science and Technology, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia;7. Harvard Forest, Harvard University, 324 North Main St., Petersham, MA 01366, USA |
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| Abstract: | Tree growth decline has been reported in many places around the globe under the context of increasingly warming climate, and strengthening drought intensity is detected to be the primary factor for such decline, particularly in northern forest sites, as well as arid and semi-arid areas. Yet, the forest growth decline in high altitude, high mountain sites certainly merits investigation. Here, we reported faxon fir (Abies fargesii var. faxoniana) forest growth decline (slope = -0.64) at the tree line (4150 m above sea level) in Miyaluo Forest Reserve (MFR) at the Western Sichuan Plateau, southwestern China since 2000. We investigated the cause of tree growth decline by applying dendrochronological approaches. We took tree-ring samples from fir trees at the tree line and developed tree-ring width (TRW) chronology. The tree growth – climate relationship analysis showed that maximum temperature (Tmax) was the primary factor limiting the radial growth of fir trees in the investigated area. The moving correlation analysis indicated the strengthening positive influence of Tmax, spring precipitation, and cloud cover during winter and monsoon period on radial growth since 2000s. Our results have shown that both thermal and hydraulic constrains accounted for the radial growth decline of fir trees at the tree line of MFR in the western Sichuan Plateau. |
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| Keywords: | Dendrochronology Tree growth decline Thermo-hydraulic constrains Western Sichuan Plateau |
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