David et Ecolog:
The fabric mats I've seen lately are herp traps--except for old-fashioned
jute and similar highly flexible material; take care to apply the mats
loosely enough to allow for shrinkage, creep, etc. You need to make sure the
site is good sedge habitat; else it will be a waste of time and money. Study
comparable sites in detail. Magic bullets only work when the conditions
under which spontaneous colonization would occur eventually without help.
Scoured bedrock?
Anchoring is a trick for a real magician. You might be better off with a
series of small silt fences. These can load up with silt and debris, which
is what you want, of course, but the strength of materials must be carefully
considered. You can set them at a slight angle to the direction of flow in a
sawtooth pattern or just make small discrete pockets that can't accumulate
enough load to blow out. In some situations you can use debris to your
advantage, such as heavy logs, stumps, etc., set at the beginning of the
high-flow season. Context, of course, is everything, so you're in the best
position to judge how to reconcile all the forces for and against you.
Sometimes even adversity can be exploited.
WT
----- Original Message -----
From: "Baker, David" <[email protected]>
To: <[email protected]>
Sent: Tuesday, November 01, 2011 2:44 PM
Subject: [ECOLOG-L] sedge/grass mats
We are looking at revegetating scoured bedrock and cobblebars after removing
all mats of reed canary grass. We were hoping to manufacture or buy sedge
mats that would hold a substrate and plant propagules in a fabric
'sandwich', anchor it to the rock substrate, and eventually capture more
sediments. Has anyone had experience with this kind of system? I've seen
something like it in erosion control mats, but the vegetation isn't already
established.
thanks for suggestions.
david
David C. Baker
Botanist, Tiller Ranger District
541-825-3149 Phone
541-825-3110 Fax
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