Tuesday, October 11, 2016

Plant on a Pedestal

Awe-inspiring!

This month I’m making an oblique and tenuous segue from Tree-Following, for I have no news to report of my serviceberry. After a long vacation, all kinds of things have to be done right away! (of course ;-) Instead, this post is about one of its brethren growing nearby under challenging circumstances. Though it’s only a meter tall and technically a shrub, it’s as impressive and inspiring as a tree.

The serviceberry doesn’t sit directly on the ground but rather on a pedestal—which sounds lovely, but it was created by “erosion of soil from around the base of a plant such that it appears to be on a pedestal” (source). [Pedestaling usually refers to erosion, but frost heaving and accumulated soil or litter can create pedestals too. And I stumbled across a webpage that mentioned plants with pedestals of lateral roots—news to me.]
Plant on a pedestal created by erosion. Arrow points to exposed roots (source).
Range managers consider pedestaled plants indicators of over-grazing. A healthy allotment (pasture) has no pedestaling. If mature plants are on pedestals, the allotment is said to be at risk, and the stocking rate should be reduced. In worst cases, erosion has pedestaled all plants and exposed roots. These allotments are classified as unhealthy. Complete removal of livestock may be necessary for the range to recover.
The pedestal has all but disappeared, leaving the serviceberry standing on its roots.
But this serviceberry grows where no cow would ever think of going—on a steep slope where there's little to eat. However, slope and rock type make erosion inevitable. At the same time, the tilted beds of sandstone and siltstone offer benefits. Soil develops from softer siltstone. Seeds germinate, grow into seedlings, and send roots down to the water that falls as rain, and accumulates in underground fractures in the sandstone.
Serviceberry on Boulder Ridge (center of photo); Hutton Lake behind. Photos taken in August.
A wild currant grows here too, just visible behind the serviceberry.
In spite of the tough situation, these shrubs have enough vigor to produce fruit!
A wild currant (red) lies next to where the root enters the ground (click on image to view).
Serviceberries.
Boulder Ridge on the south side of Hutton Lake, Laramie Valley, Wyoming.


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10 comments:

  1. Amazing? Yes! It seems impossible. Serviceberries are common around here, too, but they tend to have much friendlier growth conditions. Great tree for the meme!

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    1. Thanks, Beth. Over the years, I've learned that amelanchier is a very adaptable plant. I've seen a wide range, from trees in moist gulches in the Black Hills to small shrubs in dry habitat!

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  2. What a wonderful, wonderful post!
    And not at all tangential - you said you'd deliver a serviceberry and you did.
    I am always fascinated by thee links you make between the geology and the plants (obviously - that's in the name of the blog...)
    Your roots remind me of mighty banyan trees, although they have "aerial prop roots".
    Thanks again for joining us :)

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    1. Thanks, Pat, I always appreciate your comments! I got hooked on the interplay of botany and geology 40 years ago in field botany class. I think it might be easier to see here where it's drier and the plants aren't totally covering up the rocks ;-)

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  3. I'm intrigued... and wondering whether I might find some pedestaled plants around the neighborhood, which was formerly ranchland. Love your description of the sandstone sequence.

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    1. Amy, it would be interesting to hear what you find. From what I read in putting the post together, in less vegetated areas one has to be careful in drawing conclusions as to source of erosion ... cows? water runoff? wind? ... that might apply to your territory.

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  4. It's a beautiful landscape. Interesting about pedestaling--I've never heard of that, but I do believe I've seen examples on ranch land in the past. I love that red bark of the wild current. As always, you make a subject that I would find daunting, fascinating and real--such a great post!

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    1. Thanks, Tina! I'm glad you found this interesting. Plants are that way--if we investigate, usually some thing cool to discover (as you obviously know!)

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  5. As you said - Awe inspiring!!! Aren't the plants amazing?! Beautiful landscapes as well.

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    1. Thanks, bi. Amazing yes, and we are lucky to be plant-geeks so we can appreciate them ;-)

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