I don't know it, but I do believe it, for the simple reason that I know of several rich waters that've been subject to salt hits for years and continue to flourish with almost impenetrable weed and associated naturals year on year. The spots do not stay there year after year (I wish they did, it'd make them a hell of a lot easier to fish lol). New spots are created each year and old ones grow over (this can happen in weeks or even days when the conditions are right).
Given that your 0.1 square meter tank contains no undertow, no currents and no fish I can't see how your experiment suggests anything other than what we already know regards density.
That would be interesting to see what would happen over the course of a season. Make sure the water contains carp though lol.