3 ms·

“Trees contain lots of thin, hollow vessels and they suck water upwards by creating low pressure at the top,” So sucking / pulling?

• IsTom 3mo ago
  So a suction pump?
  • card_zero 3mo ago
    Same principle as chimneys. But I also noticed this line: > leaves which have adapted to withstand greater water stress before wilting. That must be one of the "adjustments to water transport" mentioned. So I suggest that they do, in fact, have trouble pumping water to top branches.
    • DANmode 3mo ago
      Or, it’s simply a rate to variably adjust to, so the tree is neither flooding nor parching the leaf.
    • gitaarik 3mo ago
      Maybe it's not more trouble pumping, eh, sucking water up. But that the top branches are the last ones to get water in periods of draught, and have therefore more resilience?
  • hinkley 3mo ago
    My recollection is that capillary action is a little from column a and a little from column b.