[Tagging] wetland=bog, why only "receive their water and nutrients from rainfall"?

Dave Swarthout daveswarthout at gmail.com
Sun Jan 24 00:19:08 UTC 2016


I've seen that same sentence and IMO the Wiki goes too far in specifying
that rainfall brings nutrients. While it may do that, the amount of
nutrients is surely tiny relative to what comes from the ground. Plus,
there is no way for a mapper to determine whether rainfall is an important
component of the overall nutrient picture. I believe the two words "and
nutrients" should be removed from the Wiki.
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On Sun, Jan 24, 2016 at 4:37 AM, Christoph Hormann <chris_hormann at gmx.de>
wrote:

> On Saturday 23 January 2016, David Marchal wrote:
> >
> > I tagged some bogs today, and I wondered: why does the wiki restricts
> > bogs to "depressions that receive their water and nutrients from
> > rainfall"? AFAIK, bogs are not necessarily isolated from water
> > streams or bodies. Wikipedia talls about sloping bogs where running
> > water is intercepted in the soil by plants;
>
> There are of course all kind of boundary cases but the typical bog as
> common in many parts of northern Europe is rain fed.  In German we have
> the more specific term 'Regenmoor' which indicates this.  Mires fed by
> groundwater or water inflow from the outside are usually not bogs.
> See:
>
> https://en.wikipedia.org/wiki/Mire
>
> Of course wetland=bog is currently widely used incorrectly in OSM in
> that regard.  But assessing the specifics of water chemistry and plant
> communities is not easy so this is somewhat understandable.
>
> > at least one well-known
> > example comes to my mind, the lac de Lispach, in France, which is
> > crossed by a river and still hosts a bog, and I saw 2 more exeamples
> > today on a hike in the French mountains Vosges. Shouldn't this
> > restriction be lifted, as it does not seem to be justified?
>
> Note this is not a restriction of OSM, it is simply what bogs are.  If
> you'd lift it you could simply drop most of the wetland=* distinction
> alltogether.
>
> There are true bogs in the Vosges - like around Le Tanet and Gazon du
> Faing but it seems unlikely that what you observe at the Lac de Lispach
> is a bog.
>
> > Furthermore, how could rain bring nutrients? It only brings, at least
> > directly, water, and can only bring nutrients indirectly, like with
> > erosion or bringing leaves.
>
> Nutrients can arrive via air and through rainfall.  Dust from the Sahara
> has been found to be an important source of nutrients for the Amazon
> rain forest for example.
>
> --
> Christoph Hormann
> http://www.imagico.de/
>
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-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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