| That sap theory makes sense to me... But also, we shouldn't forget that in tropical rain forests every tree is small ecosystem like made4engineering said. In so humid conditions moss is always present, bromeliads, tillandsias... Moss can hold water longer and below it, the bark is decaying...
In pots, bark stays wet longer than on trees (that's why we don't have to water plants every day) and it decays much faster creating 'building blocks'... That's why our plants can grow nice without addition of fertiliser... |