Fig. 6
From: Effect of thinning intensity on the stem CO2 efflux of Larix principis-rupprechtii Mayr
Correlogram of the correlations among stem CO2 efflux (ES) and the variables in the environmental factors (air temperature (Ta), air moisture content (Ma), relative humidity (RH) and wood temperature (Tw)), nutrient content (nitrogen concentration (N), phosphorus concentration (P) and potassium concentration (K)), wood structure (bark thickness (BT), sapwood width (SW), width ratio of heartwood to sapwood (HS) and sapwood growth rate (SR)) and nonstructural carbon (soluble sugar content (SS) and starch content (ST)) for 21- (a), 25- (b) and 41-year-old (c) Larix principis-rupprechtii. Rows and columns have been reordered using the angular order of eigenvectors. The blue color and hashing that goes from lower left to upper right represents a positive correlation between the two variables that meet at that cell. Conversely, a red color and hashing that goes from the upper left to the lower right represents a negative correlation. The darker and more saturated the color, the greater the magnitude of the correlation. The cross sign indicates that the P value of the correlation coefficient of two variables was less than 0.05