Hey good thoughts here regarding the demise of the hemlocks in the 1906 postcard, however, I would argue against the premise that all conifers are considered pioneer species in forest succession, hemlock is not. Consider this, pioneer species are not shade tolerant, hemlock is, pioneer species are short-lived (typically 50-60 years) hemlock is longer lived (some up to 600 years depending on site dynamics). While the only reliable determination for tree age is limited to ring-count, I would hedge that the hardwoods in the current photo are not older than 60-75 years. This would line up with potential HWA demise time period of the hemlocks within this region of the country. Does anyone know the HWA history of this park?
Steve Springer Urban Forester City of Bartlett -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Will Fell Sent: Friday, March 27, 2009 7:18 AM To: ENTSTrees Subject: [ENTS] Re: Hemlock view 1906/2009 That is a beautiful area....it is great the city saved it as a park. While the HWA is taking it's toll on the hemlock, I would suspect that the demise of the hemlocks in the old postcard probably predated the appearance of the HWA. Many conifers are frequently replaced by deciduous trees in an undisturbed forest, unless there is some disturbance or other factor such as frequest fire the holds the forest in a subclimax stage like the outer coastal plain of the southeast. What is the purpose of the cables and banners over the river in the background? On Mar 26, 5:17 pm, JennyNYC <[email protected]> wrote: > Hi, > > Ed suggested I take current pictures of the sites of the old postcards > I posted earlier of NYBG in the early days. Here is a colored photo > taken in 1906 and 3 pictures in the exact same location taken > yesterday. Even though the hardwoods have not leafed out, it's > apparent what is sadly missing.... > > Jenny > > http://picasaweb.google.com/JennifDudley/HemlocksThenAndNow?feat=dire... --~--~---------~--~----~------------~-------~--~----~ 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] -~----------~----~----~----~------~----~------~--~---
