[APWG] Ecosystem Restoration and Alien Species Management Re: Native grassland and forest understory weedings 99%

[Wayne Tyson]

Marc and APWG: 

I am not familiar with this ecosystem. 

Is the site in a state of "secondary succession?" 

What kind of perturbations preceded the invasions? 

Is there any continuing form of disturbance? 

Is there a "pristine" site, herbarium collection, or other source of baseline data for comparison with present (and other later) states? 

What fraction of the present vegetation consists of indigenous "climax" species and what fraction consists of indigenous "pioneer" species? 

What is the strategy with respect to on-site seeds or other viable propagules, and what are their estimated numbers? 

What is the general proximity of populations of the alien species eradicated from the site, and what is the state or potential for dispersal and in-migration? 

Are you tracking population curves for these species? When will the rates of increase "go critical?" 

What other measures have been taken to accelerate ecological succession? 

Sorry if these are too many questions. 

WT


  ----- Original Message ----- 
  From: Marc Imlay 
  To: apwg at lists.plantconservation.org 
  Sent: Saturday, August 13, 2011 2:25 PM
  Subject: Re: [APWG] Native grassland and forest understory weedings 99%


  At the 200 acre Swann Park in Charles County Maryland, the fifteen principle invasives dominated over 20 acres (very little overlap) in 1998. Presently, the Asiatic Bittersweet dominating 0.5 acres was eradicated, Periwinkle 0.5 acres eradicated, English ivy 0.2 acres eradicated, Ailanthus the 0.5 acres in 6 areas of patches eradicated, Garlic Mustard 2.5 acres reduced to 0.5 acres, Japanese stilt grass 3 acres reduced to 1 acre. Beefsteak Plant 0.5 acres reduced to 0.2 acres, MFR 1 acre now 0.2 acres (no seed producing left), Wineberry 1 acre now eradicated, Chinese Privet 0.25 acres eradicated. Gill-over the ground 0.2 acres almost eradicated. Beal's barberry 0.1 acres eradicated, Japanese barberry 0.2 acres now 0.1 acre. Bamboo 0.2 acres almost eradicated. 

  For Japanese Honeysuckle, 10 acres, the vertical component up the trees was entirely removed by 2000 and half of the horizontal component is removed because it is no longer served by light reaching the verticle component.  25% of the remaining horizontal component was removed.

  About half was removed mechanically with an average of 5 volunteers working once a month for about 10 years and half treated chemically. In summary, about 10% of the herbaceous and shrub cover was non-native as well as cover by two tree species.  It is now about 2% This site will become 30-50% invaded unless we maintain protection in a timely manner.

  Marc Imlay, PhD, Conservation biologist
  Park Ranger Office (301) 442-5657 cell 
  Natural and Historical Resources Division

  The Maryland-National Capital Park and Planning Commission

  www.pgparks.com


   

  -----Original Message-----
  From: apwg-bounces at lists.plantconservation.org [mailto:apwg-bounces at lists.plantconservation.org] On Behalf Of Craig Dremann - Redwood City Seed Company
  Sent: Friday, August 12, 2011 12:48 PM
  To: apwg at lists.plantconservation.org
  Subject: [APWG] Native grassland and forest understory weedings 99%

  Dear Marc and All,

  The remarkable other side to Mark Vande Pol's weeding, is everywhere that was covered with weeds, is now covered by local native plants in the grasslands and forest understory.

  I am pleased to hear that you joined the 99% club at Swann park in
  Maryland-- so how many people over how much time, did it take to do how many acres, with what weeds were you dealing with, and have you ever written up your experience anywhere?

  Any others who belong to the 99% club out there?

  Sincerely,  Craig Dremann (650) 325-7333


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