Experimental study of the types of cavitation by air seeding using light microscopy

Tree Physiology
Fanyi ShenXuemeng Shao

Abstract

Recently, three types of cavitation: (i) expanding gradually; (ii) expanding-exploding, becoming a long-shaped bubble-lengthening by degrees; (iii) suddenly exploding and fully filling the conduit instantly, were proposed. Directed by this theory, experiments were performed using light microscopy to study the natural drying processes of xylem sections of Platycladus orientalis (L.) Franco. Three different phenomena of gas filling process in conduits were captured by replaying recorded videos. The first phenomenon is that a bubble emerging in a conduit expands and elongates gradually to fill the conduit. The second phenomenon is that a bubble emerging in a conduit expands gradually, and then suddenly becomes long-shaped, and extends continuously. The third phenomenon is that a bubble instantly fully fills a conduit. This paper suggests in these experiments that after losing the bulk water of a section, as the water stress of that section became more severe, the water pressures of different conduits of the section were not necessarily the same, and as time went on, the water pressures decreased constantly. Considering some practical factors, the three phenomena captured in our experiment are explained by our theory.

References

Jun 19, 2002·Tree Physiology·Fanyi ShenWenjie Zhang
Oct 25, 2003·Journal of Theoretical Biology·Fanyi ShenHuo Hu
Aug 21, 2007·Journal of Theoretical Biology·T HölttäE Nikinmaa
Oct 27, 2012·Tree Physiology·Fanyi ShenLi Zhang
Jul 28, 2013·Journal of Experimental Botany·Hervé CochardSteven Jansen

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Citations

Dec 1, 2018·The Journal of International Medical Research·Yu ZhuQixiong He

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