After 37 hours of work, spread over 12 days, I’ve completed
cedar maintenance activities on the first and largest field on my winter
maintenance list. A narrow ridgetop dead
ends in the center of this eight acre field.
In this area is found the largest Blue Jay Barrens population of the
rare Edwards’ Hairstreak butterfly.
The edges of the field are bounded by woodland or cedar
thickets. This line generally marks the
transition to deeper soil.
Grass growth ends abruptly where the tree canopy closes to
block the sunlight.
Larger Eastern Red Cedars are scattered throughout the
field. In most cases, sun loving grasses
and wildflowers grow right up to the trunks of the trees.
Some wide spreading cedars develop a community of woody
plants beneath the tree canopy.
I sometimes call these grassy fields prairies and other
times refer to them as barrens. I’ve
studied many different systems of classifying grassland communities and have
trouble finding a suitable identifier for Blue Jay Barrens. Some portions of the field are treeless, but
these aren’t the broad expanses of grass associated with prairies. Several portions of this field would fit neatly
enough into categories of common classification systems. Because of a wide range of vegetation, soil
depth and bedrock type; it’s the field as a whole that doesn’t seem to
belong. The term barrens seemed
appropriate when I named the property years ago and I think it is still my
preference. Whatever it is, I’ve relieved
it of several thousand tiny cedars and the rare plants found here will benefit
by that action.
The cedars originally cut from the field formed six massive brush piles. The pile at the base of this cedar once rose up into the green branches of the tree.
Many of the large cedars have been around for more than a
century. 1938 aerial photography clearly
shows these trees having been large even back then. I believe them to be a valuable component of
this uncommon ecosystem.
Cut banks are clear evidence of massive erosion that
historically occurred on the site.
Areas of bare ground that were present when I first took
possession of the property are now covered by native vegetation. Instead of continuing their progression back
into the field, the cut banks are mellowing down to a gentle slope suitable for
plant growth.
As I worked, I used orange ribbon to mark items that I
wanted to come back and deal with later.
Here is a tangle of barbed wire, thrown into a gully decades ago and
left to rust.
At some time in the future I’ll probably have to decide how
many and what species of oak will be allowed to grow in the field. I found it interesting that the Red Oak on
the right was ringed by a thick stand of cedar seedlings, while the Blackjack Oak
on the left had almost no cedar seedlings.
Blackjack Oak is favored by the Edwards’ Hairstreak Butterfly, so I
would hope to maintain that species. If
a point is reached where some oaks must be eliminated, the Red Oak is certainly
looking like a species that could be sacrificed. It’ll be a while before a decision of that
nature will be required. I’ll probably
still be thinking about it the next time I do cedar maintenance in this field.
Merry Christmas!
ReplyDeleteMerry Christmas, Lois.
ReplyDeleteYou've done a great job restoring a beautiful landscape.
ReplyDeleteNomadic herds of elk and bison probably maintained such a landscape centuries ago.
I came across this article that might interest you. A paper has been written, taking a contrarian view of invasive species which he thinks should be referred to as "recently arrived species."
http://depts.washington.edu/oldenlab/wordpress/wp-content/uploads/2013/03/ConservationBiology_2011b_replies.pdf
Some "recently arrived species" are without a doubt beneficial. Especially honey bees.
Thanks, Mark.
ReplyDeleteI’m sure that Elk and Bison historically played an important role in maintaining open grassland in this area. I’m curious about the factors that allowed these areas to remain open during the couple of centuries since those animals disappeared from Ohio.
Recently Arrived Species is certainly an accurate description of most non-native species, but using that term doesn’t make them any more desirable. I don’t believe we know enough about the subtle workings of an ecosystem to judge the effects of replacing one species with another, even if we do notice that a native species seems to benefit by the presence of the replacement. I can understand attempting to use a non-native to replace an extinct species, but I believe such a plan should be carefully thought out prior to implementation. In most cases, there are native alternatives.
During my career, I’ve frequently witnessed the elimination of problems through the redefinition of terms or the rewriting of objectives. This strategy can achieve rapid progress while requiring no actual physical changes. Management is just a process through which we achieve our desired objectives. My personal objective is to remove non-native species from the land I manage, regardless of their perceived desirability. Changing terminology does not affect my management plan.
The article was an interesting read. Thank you for passing it along.