Developments and Analysis of Multi-Tree-Ring Width Chronologies of Meyer Spruce in the Ortindag Sand Land
Earlywood (BEW), latewood (BLW), and total ring width (BYA and BRW) chronologies were developed from spruce trees (Picea meyeri Rehd. et Wils.)from a single site, named as Bayinaobao in the northeastern Ortindag Sand Land based on the traditional method of ring-width measurement and the method of image analysis. The comparison between the BYA and BRW chronologies shows that the variation of two total ring width chronologies developed by the traditional method of ring-width measurement and the method of image analysis are quite similar. Coherence among the BRW, BEW, and BLW chronologies shows that there are significant positive correlations between the chronologies in the original, high-, and low-frequency domains, while the relationship in the low-frequency domain is stronger than the high-frequency domain. After applying a 21-year moving average, there are two low-value periods(1914-1950 and 1981-2001) and two high-value periods (1899-1913 and 1951-1980) in the BRW chronology; two low-value periods(1914-1951 and 1984-2001)and two high-value periods(1899-1913 and 1952-1983)in the BEW chronology; two low-value periods (1917-1946 and 1974-2001) and two high-value periods (1899-1916 and 1947-1973)in the BLW chronology in the past 141 years. And these high- and low-value periods of three kinds of tree-ring width chronologies correspond well. The results of tree growth-climate responses show that three kinds of tree-ring width chronologies were found to be negatively correlated with temperature while the responses to the variation of precipitation are not significant. The higher correlation coeficients between earlywood width and temperature demonstrate the value of ring-width data from the method of image analysis.
Ortindag sand landPicea meyeri Rehd. et Wils.tree-ring-widthearly wood-widthlate wood-widthclimate response
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