The
revegetation trials at the old quarry site at the South Esk Pines Reserve
in central Tasmania show how a relatively simple research project can
save hours of labour and other precious resources.
Part of the site is in poor condition with a hard, crusted surface, continuing erosion and very little natural regeneration. Attempts by the previous owners to revegetate, by planting large numbers of seedlings in and around the quarry, had failed. Bush Heritage established two revegetation trials to find out what essential factors were missing.
The first investigated the potential for ‘smokewater’ to increase germination levels. The second examined the effect of providing a seed source, modifying the germination environment and controlling grazing. The experiments were monitored closely for two years and will continue to be monitored for another three to four years.
What we found was that the absence of a ‘soil seed bank’ and suitable micro-climate were the key problems. Grazing was potentially a secondary issue. This information has now been used to develop a regeneration plan for the quarry.
Work
will begin this year using volunteers. Local native plants, still carrying
their seed, will be mulched and spread over the regeneration areas.The
mulch will provide a suitable microclimate for germination by holding
moisture, softening the underlying clay and providing the vital seed stock.
Additional fencing will reduce any grazing pressure.