The more accurate version of this question would really be something like, "Why do some trees fall over in a storm while others stay standing?" The answer is more complex than a simple distinction between old, rotted, and weak vs. young, healthy, and strong. Instead, writes Mary Knudson at Scientific American blogs, trees fall because of their size, their species, and even the history of the human communities around them.
“Trees most at risk are those whose environment has recently changed (say in the last 5 – 10 years),” Smith says. When trees that were living in the midst of a forest lose the protection of a rim of trees and become stand-alones in new housing lots or become the edge trees of the forest, they are made more vulnerable to strong weather elements such as wind.
They also lose the physical protection of surrounding trees that had kept them from bending very far and breaking. Land clearing may wound a tree’s trunk or roots, “providing an opportunity for infection by wood decay fungi. Decay usually proceeds slowly, but can be significant 5-10 years after basal or root injury.” What humans do to the ground around trees — compacting soil, changing gradation and drainage “can kill roots and increase infection,” Smith warns.
Read the full piece at Scientific American Blogs
Image: West Philly Storm - Trees Down, a Creative Commons Attribution (2.0) image from kwbridge's photostream
The massive scale and force of the ongoing bushfires in Australia is hard to comprehend.
“To the world leaders and those in power, I would like to say that you have not seen anything yet. You have not seen the last of us, we can assure you that. And that is the message that we will bring to the World Economic Forum in Davos next week.” In the Swiss city […]
This is some pretty amazing and highly rare video — seldom do you get footage of five, count ’em FIVE, California mountain lions all hanging out together. The big cats were captured on home surveillance video, in a rare gathering of the typically solitary critters.
From OneDrive to Slack, there are numerous ways to store files online. Because many platforms offer a certain amount of free storage, it makes sense to mix and match. However, spreading your files across multiple apps can make things very confusing. Rethink Files offers a simple solution. By connecting to all your other cloud storage […]
Winter can be a difficult time of year for golfers. Between the freezing temperatures and frequent snow showers, maintaining your handicap can seem almost impossible. When the fairways are frozen solid, the PhiGolf simulator lets you practice at home. This device captures every nuance of your swing to provide virtual coaching. Better still, you can […]
Photoshop is one of the most widely used photo editing tools out there, to the point that it’s the default program designers think of whenever they need work done. Small wonder, too: The flagship software in Adobe’s creative suite is very powerful — if you know how to use it. There is a lot to […]