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      Recent unprecedented tree-ring growth in bristlecone pine at the highest elevations and possible causes.

      Proceedings of the National Academy of Sciences of the United States of America
      Air Pollution, analysis, Altitude, California, Climate, Geography, Models, Biological, Pinus, growth & development, Plant Stems, anatomy & histology, Rain, Temperature

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          Abstract

          Great Basin bristlecone pine (Pinus longaeva) at 3 sites in western North America near the upper elevation limit of tree growth showed ring growth in the second half of the 20th century that was greater than during any other 50-year period in the last 3,700 years. The accelerated growth is suggestive of an environmental change unprecedented in millennia. The high growth is not overestimated because of standardization techniques, and it is unlikely that it is a result of a change in tree growth form or that it is predominantly caused by CO(2) fertilization. The growth surge has occurred only in a limited elevational band within approximately 150 m of upper treeline, regardless of treeline elevation. Both an independent proxy record of temperature and high-elevation meteorological temperature data are positively and significantly correlated with upper-treeline ring width both before and during the high-growth interval. Increasing temperature at high elevations is likely a prominent factor in the modern unprecedented level of growth for Pinus longaeva at these sites.

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          Most cited references22

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          A world-wide study of high altitude treeline temperatures

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            A re-assessment of high elevation treeline positions and their explanation

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              On the ‘Divergence Problem’ in Northern Forests: A review of the tree-ring evidence and possible causes

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                Author and article information

                Journal
                19918054
                2777957
                10.1073/pnas.0903029106

                Chemistry
                Air Pollution,analysis,Altitude,California,Climate,Geography,Models, Biological,Pinus,growth & development,Plant Stems,anatomy & histology,Rain,Temperature

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