2.6 | Tree performance
To show local adaptation of trees with different phenotypes to inland and coastal environments, we plotted the mean values of the first phenotypic PC and the mean values of the stem basal area of all living and dead trees in individual plantation rows and fitted smoothed lines in each of the inland and coastal sites using the function lowess withf = 1 in R 3.3.2. We interpreted different slopes of fitted lines between the sites as local adaptation. The stem basal area (cm2) of living trees was calculated from the measured girths of their stems. The stem basal area of dead trees was treated as 0 cm2. Thinned trees in the inland site were excluded from the calculation. Statistical differences in the mean stem basal area among taxa in each site were verified using the function kruskal.test in R 3.3.2.