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I was just wondering...do all trees grow at the same rate ?..are the rings in trees equidistant ?What causes the rings ?
Quote from: neilep on 28/12/2006 20:11:18I was just wondering...do all trees grow at the same rate ?..are the rings in trees equidistant ?What causes the rings ?First an observation. It's really more about the question than the answer.Recently the big fir in my back yard scared all the neighbours by dropping boughs up to six inches in diameter under the weight of unusually wet sticky snow. Cutting them into sections that I could carry back to my yard I examined their cores for rot to see if this very big tree, perhaps 60 - 70 feet may have to come down. Believing rings are annular I also had a curiosity about how old the limbs themselves were.Probably most of us, as kids, have looked at tree rings, especially in the forested temperate zones. The assumption that there is one ring per year and that the width of that ring reflects an optimal year, that one can even distinguish grossly at least, some seasonality of a given year, is irresistible.Getting away from rings all together we can observe all manner of evidence that some trees grow very quickly and some others very slowly and that they seem superbly adapted to their environment. On my lot there are Gary Oaks gnarled hard wood seeming unchanged year to year. A great fir on the other hand seeded itself in a crack in the concrete cap around the periphery of the house about the time I moved in and it is now a couple of feet over the eves of the house. Sadly I will have to remove it as it will undoubtedly do something nasty to my foundations one day. I don't need to cut down this fir to know that it's rings are few, nor the oak to know that they are many over the same diameter.Now that you pose the question I would be curious to see tree rings in equatorial zones where there may be a single season. Also is it not the equatorial zones where the exotic hardwoods are harvested? Do they have rings?
I have always been taught that the spaces between can be different and also tell the history of the tree and the changes in the weather during those times, a severe winter may be markd my a lets say perhaps a larger gap between the rings or slower growth something like that.. But I think that climate andt weather extremes dictate rings also for sure!.. perhaps rain and flooding also!
1° From what I remember, the rings in wood from equatorial forests are not as distinctly marked as in wood from the "temperate" zones. In addition, wood from equatorial forests shows two sets of rings per year, because around the equator the year has two rainy seasons and two dry seasons !2° There is not only a difference in colour, but also a difference in density. There are instruments available that measure the variations in density over the thickness of plywood and/or particleboard, and they can also be used to measure the variations in density of "plain wood" (for lack of a better term). 3° Microscopic evaluation shows that the clear parts of the rings have bigger cells than the dark parts. The clear parts are "early" wood, the dark parts are summer wood (or late summer wood). 4° The width of the rings gives an indication as to whether a given season/year was more or less favorable for tree growth. This succession gives a kind of bar-code that makes it possible to compare with wood that has been cut at a known date. This is what is known as dendrochronology.Once again, Wikipedia gives a good summary :http://en.wikipedia.org/wiki/Dendrochronology
Boring all the way through a tree is not more damaging than bore one inch deep on both sides. All activity (growth, transport of water and nutrients...) takes place in the layer just below the bark. In some cases, the dendrologists seal the hole with wax to prevent the tree from "bleeding". Some species heal better than others, in which an open wound may be liable to all kinds of infection.
THANK YOU for this wonderful observation....it sounds you live in a rural location.I really appreciate your post with great interest.
OH< so they really do bore holes in them!! I did not know that.. It just seemed a good idea to learn more about certain things.. Thats interesting!!
Yes, it's simple to do. I'm not a forester but used to use a boring tool routinely in forestry surveying, measuring regrowth of second growth forest, undergrowth, soil conditions etc. It's a hollow drill that's turned by hand and extracts a narrow core of wood so that you can examine the rings. You can see evidence of fire, years of poor and good growth as well as age.Off topic, if you're interested. . . you can get an idea of an evergreen tree's health, particularly of the root system, by looking at the top. If it's getting healthy new growth at the top, the roots are healthy. If the top growth is yellowish, watch out for your house in a windstorm.
ME TOO! I was curious about how they covered up the hole, or filled it in too? Now I woned if they used Like a dormant paint or spray for sealing the wound, or simply plug it back up?