Fig. 2From: Improving the design of long-term monitoring experiments in forests: a new method for the assessment of local soil variability by combining infrared spectroscopy and dendrometric dataMap of the axis 1 coordinates of the PCA for the infrared reflectance spectral data in the 5- to 10-cm layer. The Darney experimental sites exhibits spatial gradient variability (a) whereas the Compiègne beech site reveals an overall homogeneity (b) Back to article page