Table 1.
Descriptive data of sample plots of Pinus cooperi.
Table 2.
Statistical characteristics of chronologies of P. cooperi.
Fig 1.
Time series of tree-ring width and maximum latewood density.
(a), (b) Chronologies of tree-ring parameters without standardization. (c), (d) Chronologies of tree-ring parameters detrended of P. cooperi trees at sites H and HE for the period 1935–2014 and 1955–2014, respectively.
Fig 2.
Relationships between maximum latewood density (MXD) chronologies and climatic variables.
(a) Accumulated precipitation (P). (b) Mean multivariate ENSO index MEI. (c) Temperature maximum (Tmax). (d) Temperature minimum (Tmin). Significant correlation coefficients (p < 0.05) are marked with asterisks. Letters indicate previous (p) and current (c) year. JJA = June to July, SON = September to November, DJF = December to February, and MAM = May to May.
Fig 3.
Spatial correlation between MXD regional chronology and MEI parameters.
Spatial correlation between fields of MXD regional chronology and 2.5° × 2.5° gridded monthly average (December–February) of sea surface temperature (SST), sea level pressure (SLP), surface air temperature (SAT), 250 hPa zonal wind (U250), and 250 hPa meridional wind (V250), for the period 1948–2011. Correlation values are shown by color scale. Data were obtained from the National Oceanic and Atmospheric Administration website (www.esrl.noaa.gov/psd/data/correlation). Study area is indicated by a black star. 3.4 Niño region is represented by a red rectangle. Significant correlation at 90%; confidence level is r = 0.20.
Fig 4.
Inter-annual variability of variables related to biomass accumulation (mean ± SD).
(a), (b) Wood density. (c), (d) Basal area increment. (e), (f) Annual carbon uptake of P. cooperi trees at sites H and HE for the period 1935–2014 and 1955–2014, respectively.
Fig 5.
3D scatter plot of variables related to biomass accumulation.
Mean values of annual carbon uptake (C), annual mean basal area increment (BAI) and annual mean wood density (WD) of of P. cooperi trees at sites H and HE.
Fig 6.
Cumulative carbon of aboveground woody biomass of P. cooperi trees.
Gray lines represent cumulative carbon of cores. Black and red lines indicate cumulative carbon at H and HE sites, respectively, which are represented by sigmoid regression model (both R2 = 0.99).
Table 3.
Mean ± SD of annual wood density (WD kg m−3), annual basal area increment (BAI cm2) and annual carbon uptake (C kg m−2) of P. cooperi trees.