Chin J Plant Ecol ›› 2011, Vol. 35 ›› Issue (7): 707-721.DOI: 10.3724/SP.J.1258.2011.00707
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LI Zong-Shan1, LIU Guo-Hua1,*(), FU Bo-Jie1, ZHANG Qi-Bing2, HU Chan-Juan1, LUO Shu-Zheng1
Published:
2011-08-18
Contact:
LIU Guo-Hua
LI Zong-Shan, LIU Guo-Hua, FU Bo-Jie, ZHANG Qi-Bing, HU Chan-Juan, LUO Shu-Zheng. Influence of different detrending methods on climate signal in tree-ring chronologies in Wolong National Natural Reserve, western Sichuan, China[J]. Chin J Plant Ecol, 2011, 35(7): 707-721.
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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2011.00707
Fig. 2 Monthly variations of precipitation (bars), mean air temperature (line with triangles), maximum air temperature (line with squares), and minimum air temperature (line with circles) for Dujiangyan Meteorological Station (A) and CRU gridded climate dataset (B) in western Sichuan, China.
去趋势方法 Detrending method | ORW | CCF | CSS67% | CSS30 | CSS60 | CSS90 |
---|---|---|---|---|---|---|
平均树轮宽度 Mean tree-ring width (mm) | 0.856 | 0.991 | 0.992 | 0.99 | 0.986 | 0.991 |
标准偏差 Standard deviation | 0.167 | 0.144 | 0.157 | 0.099 | 0.123 | 0.152 |
平均敏感度 Mean sensitivity | 0.308 | 0.092 | 0.093 | 0.089 | 0.091 | 0.092 |
一阶自相关 Autocorrelation order 1 | 0.772 | 0.648 | 0.679 | 0.341 | 0.545 | 0.672 |
样芯间相关系数 Mean inter-series correlation | 0.498 | 0.412 | 0.406 | 0.432 | 0.411 | 0.408 |
信噪比 Signal-to-noise ratio | 14.397 | 8.381 | 7.861 | 8.777 | 8.243 | 8.143 |
群体表达信号 Express population signal | 0.935 | 0.893 | 0.887 | 0.898 | 0.892 | 0.891 |
第一特征向量解释量 Explained variance in first eigenvector | 34.59% | 23.21% | 19.41% | 21.96% | 19.57% | 20.6% |
Table 1 Main characteristic parameters of tree-ring chronologies developed from different detrending methods in Wolong National Natural Reserve of western Sichuan, China
去趋势方法 Detrending method | ORW | CCF | CSS67% | CSS30 | CSS60 | CSS90 |
---|---|---|---|---|---|---|
平均树轮宽度 Mean tree-ring width (mm) | 0.856 | 0.991 | 0.992 | 0.99 | 0.986 | 0.991 |
标准偏差 Standard deviation | 0.167 | 0.144 | 0.157 | 0.099 | 0.123 | 0.152 |
平均敏感度 Mean sensitivity | 0.308 | 0.092 | 0.093 | 0.089 | 0.091 | 0.092 |
一阶自相关 Autocorrelation order 1 | 0.772 | 0.648 | 0.679 | 0.341 | 0.545 | 0.672 |
样芯间相关系数 Mean inter-series correlation | 0.498 | 0.412 | 0.406 | 0.432 | 0.411 | 0.408 |
信噪比 Signal-to-noise ratio | 14.397 | 8.381 | 7.861 | 8.777 | 8.243 | 8.143 |
群体表达信号 Express population signal | 0.935 | 0.893 | 0.887 | 0.898 | 0.892 | 0.891 |
第一特征向量解释量 Explained variance in first eigenvector | 34.59% | 23.21% | 19.41% | 21.96% | 19.57% | 20.6% |
Fig. 3 Tree-ring chronologies developed from different detrending methods in Wolong National Natural Reserve of western Sichuan, China. The time span is A.D. 1848 to 2008, inclusive. The bold smoothed curves superimposed on the annual tree-ring indices emphasize the series of 11-year smoothing average. CCF, the chronology detrended by conservative curve fits; CSS67%, CSS30, CSS60 and CSS90 represent the chronologies detrended by cubic smoothing splines at 67% of the series length, fixed 30 years, 60 years and 90 years, respectively; ORW, the original tree-ring-width chronology.
ORW | CCF | CSS67% | CSS30 | CSS60 | |
---|---|---|---|---|---|
CCF | 0.627* | ― | |||
CSS67% | 0.661* | 0.92* | ― | ||
CSS30 | 0.571* | 0.766* | 0.815* | ― | |
CSS60 | 0.613* | 0.915* | 0.965* | 0.911* | ― |
CSS90 | 0.65* | 0.941* | 0.991* | 0.807* | 0.968* |
Table 2 Correlation matrix of tree-ring chronologies developed from different detrending methods for the well replicated period A.D. 1848-2008
ORW | CCF | CSS67% | CSS30 | CSS60 | |
---|---|---|---|---|---|
CCF | 0.627* | ― | |||
CSS67% | 0.661* | 0.92* | ― | ||
CSS30 | 0.571* | 0.766* | 0.815* | ― | |
CSS60 | 0.613* | 0.915* | 0.965* | 0.911* | ― |
CSS90 | 0.65* | 0.941* | 0.991* | 0.807* | 0.968* |
Fig. 4 Correlation analysis between chronologies derived from different detrending methods and monthly climate data at Dujiang- yan Meteorological Station. A, Correlation analysis between the chronologies and mean air temperature (black bar), maximum air temperature (grey bar) and minimum air temperature (white bar). B, Correlation analysis between the chronologies and precipitation (black bar) and relative humidity (white bar). The horizontal dashed lines indicate statistically significant correlations at the p < 0.05 level. Numbers below x-axis refer to the corresponding months from prior August (-8) to current September (9) in the correlation analysis. CCF, the chronology detrended by conservative curve fits; CSS67%, CSS30, CSS60 and CSS90 represent the chronologies detrended by cubic smoothing splines at 67% of the series length, fixed 30 years, 60 years and 90 years, respectively; ORW, the original tree-ring-width chronology.
Fig. 5 Correlation analysis between chronologies derived from different detrending methods and monthly climate data from CRU grids. A, Correlation analysis between the chronologies and mean air temperature (black bar), maximum air temperature (grey bar) and minimum air temperature (white bar). B, Correlation analysis between the chronologies and precipitation (black bar) and frequency of frost (white bar). The horizontal dashed lines indicate statistically significant correlations at the p < 0.05 level. Numbers below x-axis refer to the corresponding months from prior August (-8) to current September (9) in the correlation analysis. CCF, the chronology detrended by conservative curve fits; CSS67%, CSS30, CSS60 and CSS90 represent the chronologies detrended by cubic smoothing splines at 67% of the series length, fixed 30 years, 60 years and 90 years, respectively; ORW, the original tree-ring-width chronology.
Fig. 6 Scatter plots of annual air temperature and precipitation data of Dujiangyan Meteorological Station and the CRU grids. A, Mean air temperature. B, Maximum air temperature. C, Minimum air temperature. D, Precipitation.
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