Half-century evidence from western Canada shows forest dynamics are primarily driven by competition followed by climate

Zhang Jian; Huang Shongming; He Fangliang

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Half-century evidence from western Canada shows forest dynamics are primarily driven by competition followed by climate

机译：Half-century evidence from western Canada shows forest dynamics are primarily driven by competition followed by climate

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Tree mortality, growth, and recruitment are essential components of forest dynamics and resiliency, for which there is great concern as climate change progresses at high latitudes. Tree mortality has been observed to increase over the past decades in many regions, but the causes of this increase are not well understood, and we know even less about long-term changes in growth and recruitment rates. Using a dataset of long-term (1958-2009) observations on 1,680 permanent sample plots from undisturbed natural forests in western Canada, we found that tree demographic rates have changed markedly over the last five decades. We observed a widespread, significant increase in tree mortality, a significant decrease in tree growth, and a similar but weaker trend of decreasing recruitment. However, these changes varied widely across tree size, forest age, ecozones, and species. We found that competition was the primary factor causing the long-term changes in tree mortality, growth, and recruitment. Regional climate had a weaker yet still significant effect on tree mortality, but little effect on tree growth and recruitment. This finding suggests that internal community-level processes-more so than external climatic factors-are driving forest dynamics.

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来源
《Proceedings of the National Academy of Sciences of the United States of America.》 |2015年第13期|4009-4014|共6页
作者
Zhang Jian; Huang Shongming; He Fangliang;
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作者单位

Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2H1, Canada;

Alberta Dept Environm & Sustainable Resource Dev, Forest Management Branch, Edmonton, AB T5K 2M4, Canada;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
boreal forest; climate change; forest dynamics; tree demographic rates; tree competition;

Half-century evidence from western Canada shows forest dynamics are primarily driven by competition followed by climate

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