By: Todd Thomas, Water Resources Forester, Texas A&M Forest Service
Q: While conducting a complete harvest on a site
with dense underbrush, my crew accidentally cut through an area that should
have been reserved as an SMZ. Now that what’s
done is done, what do you recommend as our next move?
A: While
I hate to hear of the destruction of an SMZ, do not worry, not all is
lost. First things first, in order to
eliminate any confusion during site prep and planting, the area that would have
been SMZ needs to be flagged off. This
will avoid any intrusion of site prep or other management activities down the
road that could cause any damage to water quality.
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| Aerial view of Streamside Management Zones (SMZs) on a recent harvest in East Texas |
During
site preparation and planting it is extremely important that any equipment on
site stay out of the newly flagged off SMZ to avoid soil disturbance next to
the stream. This will reduce erosion and the resulting sediment that could enter the stream.
Remember, since you have harvested the timber off the tract, there will
be more water wanting to enter the stream since those trees are no longer there
to use it. This means that there will be
more water in the soil, especially right next to the stream, making the area
much more prone to rutting. If you do
decide to plant this area when you are planting the rest of the tract, be sure
and plant it by hand so you don’t rut up this sensitive area.
Going
ahead and marking off the area that would have been SMZ will also be extremely
beneficial if you plan on using herbicides during site prep. This will eliminate the possibility of any
herbicide being directly applied to the stream.
Also, not spraying here will allow vegetation to re-establish itself
quickly, and reduce erosion potential.
Not to mention this helps with maintaining biodiversity for wildlife
habitat, one of the side benefits of SMZs.
It may not be a bad idea to go ahead and plant a mix of hardwood seedlings in this area,
just to ensure that things begin to reestablish at a rapid pace. However, there is a good chance that there is
enough seed already in the soil for seedlings and shrubs to grow in this area
pretty densely. I have heard stories
relating to similar scenarios where hardwoods were planted, but were eventually
out-competed by seedlings that grew from the already existing seed bank. How you choose to approach this is totally up
to your discretion.
If you
plant anything, it is probably a good idea to at least put down some grass
seed. There is chart that is extremely
helpful in determining what to plant on page 67 and 68 of your blue book. This form of revegetation will hold the soil
in place while any seedlings are getting established. Remember, per Texas BMPs, that it is not
recommended to use fertilizer within an SMZ (page 66, blue book). This is because excessive nutrients entering
the stream can greatly degrade water quality.
In conclusion, while it is never a good thing to slick off an SMZ, there are measures to restore the SMZ and to correct the mistake. Remember to delineate the area, keep out equipment, and to actively manage the area to reestablish vegetation so that it can return to a functioning SMZ. Keep the questions coming; you can call them in to me at 936-639-8180, or email me at tthomas@tfs.tamu.edu.
*This article was published in the November 2013 edition of the Texas Logger
