期刊
FOREST ECOLOGY AND MANAGEMENT
卷 255, 期 5-6, 页码 1568-1574出版社
ELSEVIER
DOI: 10.1016/j.foreco.2007.11.022
关键词
abies lasiocarpa; growth pattern; subalpine forests; tree mortality; tree growth rings
类别
Mortality of canopy trees is an important process in forest dynamics, and can be sudden without relationship to past events or the culmination of a long decline. For three Engelmann spruce (Picea engelmannii Parry)- subalpine fir (Abies lasiocarpa [Hook.] Nutt.) forests, we reconstructed growth of canopy-size A. lasiocarpa snags using dendrochronological procedures. We compared both the magnitude and rate of growth prior to death to a control (i.e., living) group of trees. Basal area increment averaged substantially less during the last 10 years before death than for control trees. Trees that died started diverging in growth, on average, 20-40 years before death. About 50% of trees that died had chronically slow growth, 30% had pronounced declines in growth, whereas 20% had good growth up to death. The rate of change in growth indicated a decline relative to the control group of trees but overlap was extensive between the two groups. Although some trees die abruptly without evidence in their ring patterns of impending mortality, overall our results indicate that mortality of canopy A. lasiocarpa in these old forests is a gradual process related to long periods of low agrowth or Iona-term declines in growth. (C) 2007 Elsevier B.V. All rights reserved.
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