Figure 8. Differences between isohydric behavior and embolism thresholds. Isohydric species are L. tulipifera and A. saccharum. Anisohydric species are Q. alba. Panel (a) and (c) are mean P12 and P50 values (\(\pm\)SE), respectively. Bars not sharing the same uppercase letters denote significant differences (p ≤0.05) from two-tailed t -test.