Three Tree Pictures - Evanston: Custer - Dempster/Chicago - Ridge

Three Tree Pictures - Bryn Mawr to Foster

Three Tree Pictures - Near Kathy Osterman Beach/Lincoln Park

Japanese Maple (Acer palmatum)

 

The Japanese Maple is dropping its leaves

Now that the elm is spent and in its winter-nude.

Those maples leaves that linger on the branches

Are like hands outspread and chilled raw

That waited to scatter scarlet decorations

To pave the way for a sullen monarch.

Soil Microarthropod Contributions to Decomposition Dynamics turns 100

According to a recent Google scholar alert (emails I receive when others have found use in their work for my publications), a paper I wrote with a number of colleagues connected with the Institute of Ecology at University of Georgia over a decade ago has now been cited in other works more than a hundred time.  This is not a huge number of course (citation classics in ecology are cited thousands of time) but nonetheless it is gratifying.  A lot of work went into the paper, and it involved fun but sweaty times in Costa Rica, Puerto Rico, and the Southern Appalachians where I examined decomposition rates of leaf litter (there was one common substrate - Quercus prinus - across all sites).  I can measure out the cost of this paper in bot-flies in my flesh, but that's another story!

As far as I can tell when people want support from the literature to support the overwhelmingly obvious statement that decomposition rates are higher in the tropics than in the temperate zone they cite Heneghan et al 1999.  Another less obvious outcome of the work has rarely been discussed and that is the observation that in warmer and wetter parts of the world the influence of soil critters can becomes quite important in determining decomposition rates.  Small differences in the assemblage structure of soil biota at different sites can have an influence on decomposition rates and on the rate at which nutrients become available in the soil.  In the graph above the CWT site is a temperate one (Coweeta), that LUQ site is Luquillo Forest in Puerto Rico and the LAS is La Selva in Costa.  When soil microarthropods (mites, springtails, coneheads etc) were excluded there is a difference between the temperate and tropical sites in the rate of litter breakdown, but no difference between the two tropical sites (upper panel).  In the lower panel the soil critters had access to the litter and a fairly pronounced difference emerged between the two tropical sites (expressing the influence of unique soil faunal assemblages on each site).

Metempsychosis

“They believed you could be changed into a tree from grief”

(Ulysses, James Joyce)

And now you are the tree – the corruptible

Transformed into the certainty of wood,

Your roots, more expansive than your crown

Ploughing the hectic-stable earth,

Your leaves – sun-soaking and ground-shading –

Reflecting the jig of time

In the simplicity of the fall,

And in the lentic stillness of livid branches –

Offered up to appease a lurid sky

You buffer the grief of the world.