Wildfires affect tree growth and resilience in Northeastern China natural Dahurian larch forests: A dendrochronological perspective |
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| Institution: | 1. School of Ecology and Nature Conservation, Beijing Forestry University, 100083, Beijing, China;2. Beijing Key Laboratory of Forest Resources and Ecosystem Process, Beijing Forestry University, 100083, Beijing, China;1. College of Forestry, Beijing Forestry University, Beijing 100083, PR China;2. Ordos Forestry and Grassland Development Center, Ordos 017000, China;1. Jan Evangelista Purkyně University, Faculty of Environment, Department of Environment, Pasteurova 15, 400 96 Ústí n. Labem, Czech Republic;2. Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Kamýcká 129, Suchdol, 165 00 Praha 6, Czech Republic;3. Czech Academy of Sciences, Institute of Botany, Dukelská 135, T?eboň 379 01, Czech Republic;1. Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;2. College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China;3. Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, UK;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, 723 Xingke Road, Tianhe District, Guangzhou 510650, China;2. University of Chinese Academy of Sciences, 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China;3. Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, College of Life Sciences, Zhejiang University, Hangzhou, China;4. Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning 530001, China;1. West Virginia University Department of Geology & Geography, Morgantown, West Virginia, United States;2. University of Tasmania School of Geography, Planning and Spatial Science, Hobart, Tasmania, Australia;3. Gondwana Tree-ring Laboratory, Christchurch, New Zealand;4. University of Arizona School of Geography, Development and Environment, Tucson, AZ, United States |
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| Abstract: | Wildfires are natural and ubiquitous disturbances in boreal forests. Assessing their impacts on tree growth and resilience are particularly important to recognize the adaptation strategies of fire-tolerant species and forest succession in fire conditions. To date, the growth resilience of fire-tolerant species in boreal forests remains largely unquantified, and the drivers of resilience are poorly understood. Here, we measured the tree-ring widths of 99 fire-scarred trees from three sites in natural Dahurian larch (Larix gmelinii) forests. Three moderate-severity fire events in years 1987, 1990, and 2000 occurring at three sites were detected from the records of local forestry bureau. Based on tree-ring width data, we calculated resilience components (i.e., resistance, recovery, resilience and relative resilience) to quantify the responses of growth resilience in the larch trees to fires and analyzed their drivers at three sites. Results indicated that fires significantly reduced the tree growth. With the increasing tree age, these reductions were more pronounced. As for resilience components, our study showed a limited resistance but high recovery of tree growth against fires, and resistance tended to increase northwards but recovery showed the opposite, suggesting a growth-survival tradeoff was exhibited in Dahurian larch trees. With an increasing tree age, regional resistance and resilience showed a decreasing trend, whereas recovery and relative resilience showed an increasing trend. Resilience components were mainly affected by the climatic factors in spring. An increase in moisture availability enhanced resistance, a reduction in diurnal temperature range enhanced recovery, and an increase in mean temperature enhanced resilience and relative resilience. This study reveals that Dahurian larch could be even less favorable when faced with moderate or severe fire events, but a high capacity of recovery enables this species to adapt to the fire-prone condition. Moreover, this work highlights that the resilience of tree growth should be considered to understand tree behaviors and survival strategies of boreal forests following fires across fire-prone regions under future climate warming. |
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| Keywords: | Boreal forest Tree rings Resilience components Resistance Recovery Wildfire |
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