Don: Most ecologists take allelopathic to mean negative effects on other plant species. The plants that benefit could be either directly and positively affected by the allelopathic chemical (but this is unlikely), or benefit indirectly by being insensitive to the allelopathic chemical, but being freed from competition by removal of other species sensitive to the allelopathic chemicals (this is the most likely case, but no proof).
Lee DON BERTOLETTE wrote: > Lee/Mike- > In my time wandering through Kentucky woods, black walnut trees were > the only thing I saw that could alter the advance of a field of poke > salat! > My question? What would negative allelopathic refer to? I can see > that it would be positive in this case for black walnut and negative > to most anything else, but I suspect it may refer to something else > entirely? > -Don > > > Date: Thu, 24 Sep 2009 07:50:26 -0500 > > From: [email protected] > > To: [email protected] > > Subject: [ENTS] Re: Marion Brooks Natural Area, Elk County, PA > > > > > > Mike: > > > > We had a discussion a while ago on this topic, probably before you were > > on the list. Black walnut and butternut produce the allelopathic > > chemical juglone, which can stunt growth or even kill certain plant > > species, although I have seen raspberries and a species of coneflower > > (Rudbeckia triloba, the branched coneflower), growing under black > walnut > > trees. > > > > Sugar maple and bracken fern have also been found to produce > > allelopathic chemicals that reduce germination and growth of competing > > plants. There are probably many other examples. > > > > Lee > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Eastern Native Tree Society http://www.nativetreesociety.org Send email to [email protected] Visit this group at http://groups.google.com/group/entstrees?hl=en To unsubscribe send email to [email protected] -~----------~----~----~----~------~----~------~--~---
