Why trees can't grow taller than around 100 metres(newscientist.com)
newscientist.com
Why trees can't grow taller than around 100 metres
http://www.newscientist.com/article/mg21729004.800-why-trees-cant-grow-taller-than-100-metres.html
18 comments
> Also, http://en.wikipedia.org/wiki/Hyperion_(tree) is 115m.
And the tallest reliably measured australian mountain ash (Eucalyptus regnans) was 112m, with disputed claims of individuals in the 130m range.
And the tallest reliably measured australian mountain ash (Eucalyptus regnans) was 112m, with disputed claims of individuals in the 130m range.
Oops, apparently, one can get upvotes for giving a reference to the thread one is posting in. That first link should have been http://news.bbc.co.uk/2/hi/science/nature/3643899.stm
Iirc albatrosses actually can't take off from the ground. They need to jump off a cliff with an updraft. So they're very careful about where they land.
> Iirc albatrosses actually can't take off from the ground
Of course they can.
https://www.youtube.com/watch?v=gKTfcs6LL6A
Of course they can.
https://www.youtube.com/watch?v=gKTfcs6LL6A
Hmm...
Having now gone back and researched that a little better, it's only Waved Albatrosses I was thinking of and sources seem to disagree on whether they can take off from flat ground or not. They certainly prefer a cliff, and will make a long walk to get to one if necessary.
Having now gone back and researched that a little better, it's only Waved Albatrosses I was thinking of and sources seem to disagree on whether they can take off from flat ground or not. They certainly prefer a cliff, and will make a long walk to get to one if necessary.
This is an interesting video with an alternate explanation - the pressure required to get water to the top of the tree. Normally you can only suck a water column up 10 meters, and that's using a perfect vacuum - but trees can grow higher than that. The secret sauce is that in a liquid rather than a gas, you can have a negative pressure.
http://www.youtube.com/watch?v=BickMFHAZR0
http://www.youtube.com/watch?v=BickMFHAZR0
So, how long until someone engineers some 'helper pumps' to assist trees in pumping nutrients around. Be nice to see some 1000-foot trees in manhattan to crowd out some skyscrapers.
>>Sugars accelerate as they move
That's no way to describe the diffusion gradient.
Also, this paper does not cover all of Plantae, so for all we know, other Embryophytes may be limited in height by an entirely different factor.
That's no way to describe the diffusion gradient.
Also, this paper does not cover all of Plantae, so for all we know, other Embryophytes may be limited in height by an entirely different factor.
The creatures that we call trees, and the Earth had experimented with a lot of different types of trees, are in fact much higher if we count the roots.
Yes, but the tallest trees (California redwood) have shallow root systems (a couple meters). Are there trees commonly over 100 meters counting the roots?
I remember learning this in my high school biology class a few years ago. I recall the limit as being 120 meters because of the force of gravity.
Xylum and phloem... memories.
Xylum and phloem... memories.
Gravity and cohesion-tension theory.
"Xylum up, phloem down"
This doesn't seem to preclude a tree that's taller than that, but simply an outlier in its leaf size. Unless I'm misunderstanding something...
The New Scientist article isn't very clear. The paper proposes that tall trees are unable to gain energy from leaves above a certain length (my not great understanding is that a larger leaf can generally move more energy than a shorter leaf, but a longer stem can only move so much, limiting the useful leaf size).
However, this theory is less observational; that, IMO, makes it a better one, even if the maximum height it predicts is of by 10% or so.
In fact, that is fairly typical for scaling laws. For example, bumblebees and swans are outliers in the field of flying insects, respectively flying birds. That is why, in those circles, a standard joke is that bumblebees cannot fly, and swans can fly, but cannot take off from the ground.