Yes, it?EUR??,,????'?????<????????????EUR??,,??s true that plants will naturally revegetate any site where there?EUR??,,????'?????<????????????EUR??,,??s plenty of rainfall and there?EUR??,,????'?????<????????????EUR??,,??s some sort of soil for them to grow in. Now comes the ?EUR??,,????'?????<????????but.?EUR??,,????'?????<???????? First, natural regeneration is very slow in arid climates. It would take not 25 years, but 200 years or more in some cases. Second, many soils are highly erosive and will wash away from slopes if not covered with vegetation in the first year or two, which in most cases means somebody needs to re-seed and/or replant. Third, disturbed sites are often left with highly unnatural contours that most people find aesthetically displeasing and discordant with surrounding landscapes. In these cases, recontouring should occur before revegetation.
Fourth, disturbed sites such as quarries are often left with nothing but exposed bedrock, upon which plants cannot grow until either imported soils are added or the process of time (often hundreds of years) degrades the rock surface enough that plants can find a place to sink their roots. Finally, invasive/noxious species are so prevalent and aggressive in some areas that if desirable species are not immediately established (which usually means seeding or planting), the revegetation will consist almost entirely of invasives. So, I hope those in the habit of creating highly disturbed landscapes don?EUR??,,????'?????<????????????EUR??,,??t use this article as an excuse to abandon their responsibility to restore the land, and that the article doesn?EUR??,,????'?????<????????????EUR??,,??t fool landowners and governments into believing that no restoration is required?EUR??,,????'?????<???????????cause it ain?EUR??,,????'?????<????????????EUR??,,??t gonna happen all by itself except in favorable circumstances.
Kathleen Snodgrass
Facilities Architect,
Forest Service
Missoula, Mont.
I am disturbed to see this article showcased in your online publication. The findings may be appropriate in very limited circumstances that may or may not apply to anything that anyone in the U.S. will deal with. This article, as simply stated, essentially states it?EUR??,,????'?????<????????????EUR??,,??s OK to walk away from huge scale land, life and natural systems deformations, because within 25 years it will repair itself back to normal, anyway.
This, in fact, does not happen in the vast majority of restoration sites (natural or human assisted). Rather, perhaps a few (on scale of tens or so) of the thousands or tens of thousands of grossly disturbed natural habitats will ever ?EUR??,,????'?????<????????restore?EUR??,,????'?????<???????? themselves to ?EUR??,,????'?????<????????pre-project conditions,?EUR??,,????'?????<???????? which is in of itself natural. The others will suffer varying degrees of permanent alteration where biodiversity, food web and ecological processes and connections will be reduced, compromised or precluded.
Even with much help and financial inputs (and energy), most projects will never be restored to pre-project conditions. We can, however, attempt to get close and get to a point where the restored habitat will start to approximate some of these ?EUR??,,????'?????<????????bigger picture?EUR??,,????'?????<???????? pre-project ecological interactions and processes.
There are decades of peer-reviewed scientific research and experience published that support ecological restoration in all its varying degrees of human involvement (www.sercal.org) or its national parent, the Society of Ecological Restoration.
Daniel Wilson
WELDesign, Inc.
Santa Barbara, Calif.