Urban trees 'live fast, die young' compared to those in rural forests

Re:Urban trees 'live fast, die young' compared to those in r... by LinuxBender on Thursday May 09, 2019 @02:37PM (#19870901)

10k above sea level would also put the tree well above major jet streams that carry pollution. A similar pattern occurred with a group in (I think) Norway, that were said to have the "fountain of youth", but it just simply turned out they were out of the way of pollution.

[ Parent | on HN ]

Re:Urban trees 'live fast, die young' compared to those in r... by zizee on Thursday May 09, 2019 @07:36PM (#19873579)

Sorry to nitpick, but I think you might have confused 10k feet vs 10k meters (10kms). The grandparent was using feet. 10k feet is about 3kms, the height of a medium sized mountain. 10kms is about the height of Everest, whose peak does not have trees at all. I don't know at what elevation trees stop appearing, but it would be well under 10kms.

[ Parent | on HN ]

Re:Urban trees 'live fast, die young' compared to those in r... by banana_smoothie on Thursday May 09, 2019 @09:02PM (#19874129)

> I don't know at what elevation trees stop appearing

This is known as the "tree line", and varies a lot based on particular location (due to sun exposure, climate, and plant species). Here's a wikipedia article which outlines where the tree line: https://en.wikipedia.org/wiki/Tree_line . Summary is that the treeline is rarely above 12k feet (3500m), though in Bolivia it gets all the way up to 17k feet (5200m)!!

You are probably correct w.r.t. the main flow of the jet stream being far in excess of the highest tree lines in the world. The jet stream's main flow is usually 30k feet (10k meters) or higher.

[ Parent | on HN ]