Journal
CANADIAN JOURNAL OF FOREST RESEARCH
Volume 48, Issue 9, Pages 1108-1113Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfr-2018-0025
Keywords
dendroecology; Pinus uncinata; subalpine forests; recruitment; tree rings
Categories
Funding
- project RECREO - Organismo Autonomo de Parques Nacionales [387/2011]
- Juan de la Cierva-Formacion grant from MINECO [FJCI 2016-30121]
- COST Action SENSFOR [ES1203]
- Ministry of Education, Youth and Sports of Czech Republic within the National Sustainability Program I (NPU I) [LO1415]
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Long-term fluctuations in forest recruitment, at time scales well beyond the life-span of individual trees, can be related to climate changes. The underlying climatic drivers are, however, often understudied. Here, we present the recruitment history of a high-elevation mountain pine (Pinus uncinata Ram.) forest in the Spanish central Pyrenees throughout the last millennium. A total of 1108 ring-width series translated into a continuous chronology from 924 to 2014 CE, which allowed estimated germination dates of 470 trees to be compared against decadal-scale temperature variability. High recruitment intensity mainly coincided with relatively warm periods in the early 14th, 15th, 19th, and 20th centuries, whereas cold phases during the mid-17th, early 18th, and mid-19th centuries overlapped with generally low recruitment rates. In revealing the importance of prolonged warm conditions for high-elevation pine recruitment in the Pyrenees, this study suggests increased densification and even possible upward migration of tree-line ecotones under predicted global warming.
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