interseeding prairie forbs into native grass...
TRANSCRIPT
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Interseeding Prairie Forbs into Native Grass Stands
Molly A. Tranel
Habitat Evaluation Biologist
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Justification
• Managers want more information about maintaining diversity in grasslands
• Forb rich grasslands provide food and structure for grassland birds
• Many older MNDNR grassland plantings didn’t include forbs
• Techniques for effectively establishing forbs would be valuable to managers
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Objectives
• Investigate effects of mowing and herbicide treatments on the establishment and persistence of forbs interseeded into established native grasslands
• Investigate effects of the various treatments on insect community abundance
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Study Design
• Uniform native grass stands with little or no forbs
• Excludes wetlands
• Must be >10 acres
• 1 pilot site in 1st yr
• 16 study sites in 2nd
yr
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Site Preparation
• Pilot season on 1 site began in Fall 2008.
• 8 sites were burned in Fall 2009
– Broadcast frost seeded in Winter 09-10
• 8 sites were burned Spring 2010
– Seed was cold/moist stratified and interseeded after burn
• Treatments began Summer 2010
Photo by J. B. Bright
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Treatments
• Mow: 4-6 in. ONCE when veg. is 10-12 in. tall
• Mow: 4-6 in. TWICE when veg. is 10-12 in. tall
• Grass herbicide (Clethodim) @ 8 oz/acre in late May-early June
• Grass herbicide (Clethodim) @ 16 oz/acre in late May-early June
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Study site design
Purple line = WMA
Red line = site (or block)
Black line = plots (1 of 4 treatments or control)
Yellow lines = transects
Blue circles = sampling frame
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Study Sites
•Each site received all treatments to account for variability between sites
• Each treatment was replicated twice at each site.
Grass Herbicide
Mow
Control
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Common Name Scientific Name
Leadplant Amorpha canescens
Black eyed Susan Rudbeckia hirta
Maximilian Sunflower Helianthus maximilianii
Yellow Coneflower Ratibida pinnata
Golden Alexanders Zizia aurea
Sky Blue Aster Aster oolentangiensis
Canada Milk Vetch Astragalus canadensis
Prairie Cinquefoil Potentilla arguta
White Prairie Clover Dalea candida
Purple Prairie Clover Dalea purpurea
False Sunflower Heliopsis helianthoides
Alumroot Heuchera richardsonii
N. L. Purple Coneflower Echinacea angustifolia
Prairie Blazingstar Liatris pycnostachya
Common Milkweed Asclepias syriaca
Blue Vervain Verbena hastata
Rough Blazingstar Liatris aspera
New England Aster Aster novae-angliae
Prairie Onion Allium stellatum
Hoary Vervain Verbena stricta
Heath Aster Aster ericoides
Stiff Goldenrod Oligoneuron rigidum
Culver's Root Veronicastrum virginicum
Showy Tick Trefoil Desmodium canadense
Wild Bergamot Monarda fistulosa
Prairie Coreopsis Coreopsis palmata
Partridge Pea Chamaechrista fasciculata
Closed Bottle Gentain Gentiana andrewsii
Heart Leaf G. Alexander Zizia aptera
Brown Fox sedge Carex vulpinoidea
Seed Mix of 30 forbspecies
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Vegetation Sampling
Baseline Data collected
Prior to treatments:
• V.O.R. (Robel et al. 1949)
• Litter depth
• % cover (Daubenmire 1959)
• Presence/absence
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Preliminary Findings
ControlNo
treatment
Herbicide High rate
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Preliminary Findings
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Preliminary Findings
• Results vary by site.
• Herbicide rates did suppress grass at most sites, especially those with sandy/poor soils.
• Herbicide treatments did not appear to suppress grass at some sites.
• Could be related to soils or cultivars
• Higher rates may be needed with richer soils.
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Mean VOR - 5 Study Sites
Visual Obstruction Reading (dm)
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Pilot Site Early Data
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Mean VOR - Pilot Site
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Lessons Learned• Take care of your weeds before you interseed!
• As vegetation gets taller, mean VORs get more variable.• Will add additional sample points next year.
• Lots of site to site variation- need to have all treatments replicated at all sites.
• Use of grass selective herbicide will set native grasses back but not kill them.• Applications in the control of RCG and use in
seed production plots.
• The treatment plots created a mosaic of habitat for grassland nesting birds.
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• Vegetation survey was conducted Aug 2009
– Canada/Giant goldenrod present in 77.5% of plots
– Switchgrass present in 75% of plots
– Sweet clover present in 72.5% of plots
– Swamp aster present in 25% of plots
– Smooth brome present in 52.5% of plots
Beaver Falls Site Visit
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Beaver Falls Site Visit
Spring 2010 prior to study
Burned April 2010
Post burn April 2010
Broadcast seeding April 2010
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Special Thanks• Biometricians: John
Fieberg & John Giudice
• Interns: Jeff Swanson & Charity Kern
• Funding: MNDNR
• Labor: MNDNR & USFWS area wildlife managers, Jeff Zajac
• Randy Schindle, GeneviveBrand, Kurt Haroldson, Dick Kimmel, & Eric Dunton
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Questions?