[permaculture] what are your thoughts... Warming world sends plants uphill
tomasremiarz at cooptel.net
Sat Jun 28 12:52:24 EDT 2008
we do know that some plant communities (and associated animals) are
already reacting to changing climatic patterns - earlier flowering, change
in some birds from migratory to resident species are other examples. we
don't know how that will affect the types of ecosystems we'll see in the
future. there is no precedent that we know of. when we speak of global
warming we have to keep in mind that not all the world warms up at the
same rate, some parts may even experience cooling, at least temporarily.
expect the unexpected.
> 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
>>> 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
>> 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
>> 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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Tomas Remiarz - GreenLand Services
Woodland Creation and Management
Permaculture Design and Practice
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