Received date: 2004-05-14
Revised date: 2004-09-26
Online published: 2004-11-25
Supported by
National Natural Science Foundation of China, No.90102005; No.90211018; No. 49971079; Knowledge Innovation Project of CAS, No. KZCX3-SW-321; No.KZCX1-10-02
The Yili Valley of west Tianshan is located in semi-arid area of Northwest China. Tree ring increment cores were sampled for Picea schrenkiana from the upper and lower treelines of three sites, which present warm-dry, warm-moist and cool-moist climate patterns respectively. Six standardized chronologies were developed using a 60-year spline function, the correlation between tree ring-width and climate was analyzed. Comparison of chronology statistics among chronologies indicated that ring-width at the lower treeline showed stronger high- and low-frequency signals than those at the upper line. Correlation analysis showed that the growth of Picea schrenkiana was significantly sensitive to climate variations. However, there were different relationships between the tree growth and climate at different aspects of slope and altitude of the valley: tree growth at lower treeline on the south-facing slope was positively correlated (p<0.05) with precipitation in July and August during the current growing season, while at the lower line of the north-facing slope, tree growth showed a significant (p<0.05) positive correlation with monthly minimum temperature from November to January prior to the growing season, whereas there was no significant correlation between tree ring-width and climate variations at the upper line of both north- and south-facing slopes. These results suggested that different climate signals revealed in tree-ring width of Picea schrenkiana may be caused by the influence of topography: the variation of precipitation between the upper- and lower-treeline and the difference of temperature between the two aspects of the slope. In conclusion, there is not only precipitation signal but also temperature information in the tree ring-width of Picea schrenkiana. This dendroclimatological potential provides a possibility for past climatic reconstruction of both precipitation and temperature in this area.
Key words： Yili; tree ring; climate change; Picea schrenkiana
ZHU Haifeng, WANG Lili, SHAO Xuemei, FANG Xiuqi . Tree Ring-width Response of Picea schrenkiana to Climate Change[J]. Acta Geographica Sinica, 2004 , 59(6) : 863 -870 . DOI: 10.11821/xb200406008
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