[permaculture] what are your thoughts... Warming world sends plants uphill
jordan at riseup.net
jordan at riseup.net
Sat Jun 28 06:07:31 EDT 2008
so, are you saying that plant communities will be disrupted first and
THEN ecosystem types will change as temperatures increase?
>> so here is my question... why would global warming lead to increased
>> desertification and a benefit to grasses. in my bioregion Douglas firs
>> have evidence in the fossil record 50 million years, to the triassic and
>> confirmed fossils are found in navada in the eocene... which was warm
>> wet and tropical...
>> I guess i don't see how warming will do what this article says...
> what the article actually says is:
>>> "Long-life plants, such as trees and shrubs, did not show significant
>>> shifts, whereas short-life species, such as herbs,
>>> showed a strong upward shift," he said.
>>> "Herbs, by having a short life cycle, have had several generations
>>> a decade that allows for a faster dispersal of
> there are (at least) two posible explanations for this difference
> - trees react slower to temperature changes and therefore move slower
> - trees are less affected by temperature changes, and therefore move
> little or hardly at all
> the timescale of this study has obviously not allowed for a conclusive
> answer to which of the two is correct, or if something else entirely is
> going on.
> what may be happening is a change in the woodland ground flora, while the
> canopy remains relatively stable. that said, there has been a shift in
> british woodlands with beech moving further north, which is only partly
> related to them being planted where they wouldn't have occured naturally.
> still that would represent a change canopy composition rather than a
> wholesale change in ecosystem type.
> Tomas Remiarz - GreenLand Services
> Ecological Restoration
> Woodland Creation and Management
> Permaculture Design and Practice
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