On 01-Jul.-21 8:18 a.m., Frederick W. Schueler wrote:
> During the day we should each go out to some place where we can think about the history of the chosen site in relation to the fact that People have lived here ever since deglaciation, with an ecology that has had human management and direction from the beginning.
* ...so I've gone out to out Nutrient Depletion Glade, which is an
opening in what's grown up into an area of thickets of Thuja
occidentalis Cedars with lanes and openings of bare and mossy areas
between them.
We began to think about the nutrient status of this habitat around 1981
when we buried a road-killed Cat there, and saw a pale green patch of
dense grass (of a species I'm now going to buckle down and identify)
over the burial site. The soil was shallow over limestone bedrock, so it
was easy to visualize hungry livestock having been pastured on sparse
vegetation, and then defecting the residue into barns where it would be
used on gardens near the houses.
We then heard the archetypal eastern Ontario story of Loyalist settlers
burning the trees as they cleared the forest cover, and extracting the
potash to export it as the first crop from their cleared land, thereby
losing the mineral nutrients accumulated by the forest over thousands of
years.
In 1998 we planted some Opuntia fragilis cacti (descended from an
Okanagan pad that attached itself to Aleta in 1989) in the "shallow/bare
soil limestone flats among Thuja clumps" here, and these survived for a
while, but were gone by 2004. Then in 2007 the way other areas of our
land were growing up alerted us to the idea that we could make this
clearing a sort of memorial to the low nutrient status of our land when
we moved here, and we started to call it the Nutrient Depletion Glade,
and to remove nutrients in the form of Cedars cut out of the clumps,
Cedar branchlets swept up under the trees in the fall, and removal of
any Fox or Grouse droppings which happened to be left there.
Aleta has a painting of the south border of the Glade -
https://karstaddailypaintings.blogspot.com/2017/03/spring-snow-among-cedars.html
- and I've taken some photos which I'll post when this is a
doingnaturalhistory post. About 30% of the glade floods in some springs.
Today there was a sparse flowering of the little pale-blue Lobelia
spicata, with the blooms of the few Penstemon digitalis and Balsam
Ragwort from earlier in the spring faded. These three species are more
common here when a damp spring follows a moist summer. Early in the
spring there are a few Taraxacum palustre Dandelions. These herbs, and
some other species are sparse on the ground, with the small dense
patches of Grass, lots of bare soil, areas of flat moss, and patches of
grey lichen.
In some years there's a scattering of shells, and a few adults, of the
introduced Cepaea nemoralis snails in the glade, and we've found a
couple Novisuccinea shells, but when the spring flooding floats the
fallen Cedar branchlets into drift there are never any little snail shells.
One of the features of much of eastern Ontario is the absence of species
which haven't been able to reach habitats created by secondary
succession. I've long nattered about the necessity of introducing forest
floor herbs to plantation and secondary forests, and we're wondering if
we should or could introduce alvar plant or snail species which might be
adapted to the glade.