Fig. 3
From: Northern forest tree populations are physiologically maladapted to drought
Plasticity among populations of lodgepole pine. a Response of stable isotopes in two years of different moisture levels. b Average tracheid wall thickness and lumen diameter as a function of cell number under different moisture conditions in the year 2000 (not dry) and 2002 (dry). Each of the regional populations are colored according to Fig. 1. Based on n = 1170 (4 populations × 5 provenances × 1 tree × 3 sites × 2 blocks × 10 years, minus 3 trees). Error bars (a) and ribbons (b) are standard errors of the mean
