On 2002-05-31 22:49, R. Gregory '67 wrote:
On 2002-05-31 22:07, Earthshine wrote:
Actually having more trees is not necessarily better. Some of the forests are in pretty poor health due to natural fire being excluded from the ecosystem. A healthy ponderosa pine forest has a low density of trees. Most ponderosa forests today have 4 or more times the density of trees as a healthy forest would.
In Sequoyah National Park in California, it was noticed that no new trees were growing, until the park service started a prescribed burning program. It turns out the sequoyah trees need periodic fires in order to sprout new seedlings.
As for lighting strikes, the associated press reported last month that 4 out of 5 were from human mistakes/being careless these days.
In the eastern U.S., most fires are accidental, caused by human mistakes.
In the western U.S., most fires are caused by lightning.
The A.P. could very well be right, but while it is true that the east gets many more fires than the west, it is also true that far more acres burn in the west.
Except in a few peculiar areas like Florida and Minnesota, and during periods of exceptional drought, most fires in the eastern U.S. burn themselves out and don't burn more than a few acres. Western wildfires (mostly lightning-caused) are often very large and catastrophic, because of the low humidity.
Fire fighting techniques may be better, but some poor bastard still has to go toe to toe with the flames.
I've done it, and it was hard exhausting work but also a lot of fun. I'd hardly use "poor bastard" :smile:
<font size=-1>[ This Message was edited by: R. Gregory '67 on 2002-05-31 22:52 ]</font>