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Thanks Tom Beno!
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#3
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Thanks Tom Beno!
some other guy wrote:
(Larry Harrell) wrote in message It has been proven that giant sequoia's and coastal redwood's do great and start to reproduce AFTER a fire. Not only does the fire pop the cones but it lays down the all important ash which stimulates growth. But I know you know all that Larry. Apparently you don't know "all that". 8^) But you do know a lot more than some. Giant Sequoias and Coast Redwoods do NOT have serotinous cones (cones which "pop open" after a fire). GS seeds need mineral soil to germinate and survive. Redwoods have an easier time at reproducing from seed, though. You are right about ash being a very important component in our forests. Wood ash has nearly all the important macro-nutrients, as well as a wide variety of micro-nutrients. Wood ash is also beneficial in adjusting the pH of the forest soils, compensating for the acidic pine needles which helps control competing vegetation under pines. Larry eco-forestry rules! Check your silvics books: http://www.na.fs.fed.us/spfo/pubs/si.../giganteum.htm "Giant sequoias have serotinous cones which, at maturity, may remain attached to the stems without opening to release seeds. For 20 years or more, cones may retain viable seeds and continue to photosynthesize and grow, their peduncles producing annual rings that can be used to determine cone age (16,36)." But if you read further you will come across discussion of other vectors of dispersal, namely the critters. As far as seedling development goes, Larry is bang on: "Seed dormancy is not evident in giant sequoia, so surviving seeds germinate as soon as conditions are favorable (17). Germination is epigeal. The most significant requirement for germination is an adequate supply of moisture and protection of the seed from desiccation. This is best provided by moist, friable mineral soil that covers the seed to a depth of 1 cm (0.4 in), and that is partially shaded to reduce surface drying." Bang on again with the redwoods: "Redwood cones dry readily under conditions of low humidity and quickly release their seeds with slight shaking." I'm told that Vol.1 of the Silvics of North America is out of print... any idea where I might track one down? Scott forestry is mind-boggling |
#4
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Thanks Tom Beno!
(Scott Murphy) wrote in message . com...
Check your silvics books: http://www.na.fs.fed.us/spfo/pubs/si.../giganteum.htm "Giant sequoias have serotinous cones which, at maturity, may remain attached to the stems without opening to release seeds. For 20 years or more, cones may retain viable seeds and continue to photosynthesize and grow, their peduncles producing annual rings that can be used to determine cone age (16,36)." But if you read further you will come across discussion of other vectors of dispersal, namely the critters. Well, then, I will take your word on that and stand corrected. Once you stop learning stuff, you might as well die G. I always see the Sequoia cones on the ground, already opened. I did find some closed ones and tried to use the seed but the seeds seemed to be unviable 8^( As far as seedling development goes, Larry is bang on: "Seed dormancy is not evident in giant sequoia, so surviving seeds germinate as soon as conditions are favorable (17). Germination is epigeal. The most significant requirement for germination is an adequate supply of moisture and protection of the seed from desiccation. This is best provided by moist, friable mineral soil that covers the seed to a depth of 1 cm (0.4 in), and that is partially shaded to reduce surface drying." Bang on again with the redwoods: "Redwood cones dry readily under conditions of low humidity and quickly release their seeds with slight shaking." I'm told that Vol.1 of the Silvics of North America is out of print... any idea where I might track one down? Scott forestry is mind-boggling I think your best bet would be a used bookstore in a town with a forestry college, Scott. Larry |
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