期刊
TREES-STRUCTURE AND FUNCTION
卷 24, 期 2, 页码 363-373出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00468-009-0406-0
关键词
Tree-ring; Growth variation; Abies georgei var. smithi; Altitudinal gradients; Sygera Mountains; Southeastern Tibetan Plateau
类别
资金
- National Natural Science Foundation of China [30670383, 40871097]
- Chinese Academy of Sciences [KZCX2-YW-QN111]
A network of nine Smith fir (Abies georgei var. smithii) ring-width chronologies was constructed from sites ranging in elevation from 3,550 to 4,390 m above sea level (a.s.l.) in the Sygera Mountains, southeastern Tibetan Plateau. High-elevation trees had lower growth rates than did low-elevation trees. The mean tree-ring series intercorrelation (RBAR) increased with elevation. Principal component analysis identified three elevation zones (around 3,600, 3,800, and > 4,200 m a.s.l.) with distinctive tree-ring growth patterns. Five chronologies with elevation > 4,200 m a.s.l. were highly correlated. Overall, the initiation of tree-ring growth in Smith fir is controlled by common climatic signals, such as July minimum temperature, across a broad altitudinal range. Precipitation was not a growth-limiting factor across stands. Regardless of differences in stand elevation, topographical aspect, and tree age, the radial growth of Smith fir trees was markedly similar in response to common climatic signals, perhaps as a result of the relatively high-elevation of these forests (above 3,550 m a.s.l.) and the abundant summer monsoon rainfall. In addition, radial tree growth along the altitudinal gradients was indicative of a recent warming trend on the southeastern Tibetan Plateau.
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