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| e did the same experiment as Lewis’ (1994), but came out with different kinetics of embolus collapse in the tracheids of stem segments of Platycladus Orientalis L.. Tangential wood sections were trimmed. They were observed under a microscope, while segments were dehydrated and rehydrated. As in Lewis’ experiment, following the initial contract of the gas in the tracheids of a segment, the elongated bubbles began to shrink. Then, we found that there were spherical bubbles between coverslip and glass slide, and the bigger ones were getting larger and the smaller ones contracted gradually while the elongated bubbles in the tracheids collapsed. By calculation, the total amount of gas in all bubbles at the beginning of the collapse of the elongated bubbles was almost the same as the amount of gas midway and at end. It has been known that when two spherical bubbles in an identical ambience connect the gas in the smaller one will pass into the larger one, and the bigger one will get larger a |
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| Keywords:air dissolution, bubble collapse, embolism repair, tracheid. |
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