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WEED MANAGEMENT FORESTED WETLANDS Weed Problems Early successional – let nature take its course Invasive, persistent exotics – nature needs some help Florida Institute of Phosphate Research Primrose Willow and Cattail Considered as nuisance species by DEP

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Presentation Transcript
slide1

WEED MANAGEMENT

FORESTED

WETLANDS

weed problems
Weed Problems
  • Early successional – let nature take its course
  • Invasive, persistent exotics – nature needs some help

Florida Institute of Phosphate Research

slide3

Primrose Willow and Cattail

  • Considered as nuisance species by DEP
  • Primrose willow a category I invasive according to FLEPPC

Florida Institute of Phosphate Research

slide4

Reclaimed Forested Wetlands

  • Primrose willow, cattail and elderberry effects on wetland trees
  • Can trees shade-out primrose, etc.?
  • Consequences: let nature take its course vs. herbicides, mowing, etc.

Florida Institute of Phosphate Research

slide16

Shade Tolerant Understory

With Primrose willow

slide24

Reclaimed Forested WetlandsRole of Primrose Willow and Elderberry

  • Pioneer species (shaded out by trees)
  • Organic matter and nutrient accumulation
  • Early canopy closure (shade tolerant understory)

Florida Institute of Phosphate Research

slide25

Forested WetlandsDealing with Primrose Willow and Cattail

  • Wetland trees grow in spite of these “nuisance” species
  • Trees can shade them out
  • Weed control efforts may damage trees
  • Early canopy closure (trees + primrose willow) enhances understory

Florida Institute of Phosphate Research

trees can grow with and shade out primrose willow and cattail
Trees Can Grow with and Shade-out Primrose Willow and Cattail
  • Trees grow slower in ponded conditions
  • Better growth if moist but well-drained
    • Seepage slope vs. flood plain vs. pond
    • Trees grow faster on primrose willow sites than cattail sites
  • Need sufficient tree density
  • Need time and patience
wetland trees and weeds
Wetland Trees and Weeds
  • Timber vs. Natural System Restoration
  • Popash & Red Maple growth better with primrose willow than without (triclopyr sprayed around bagged trees)
  • Bald Cypress has some tolerance to triclopyr
  • Tree growth better with elderberry than with primrose willow
  • Organic matter accumulation less with weeds removed (soil elevation difference)
slide40

Reference

Richardson, S.G., and R.A. Kluson. 2000. Managing nuisance plant species in forested wetlands on reclaimed phosphate mined lands in Florida, p. 104-118. In P.J. Cannizzaro (ed.). Proceedings of the 26th Annual Conference on Ecosystems Restoration and Creation. Hillsborough Community College, Tampa, Florida. May, 1999.