seedling recruitment in variable hydrologic regimes...seedling recruitment in variable hydrologic...
TRANSCRIPT
![Page 1: Seedling recruitment in variable hydrologic regimes...Seedling recruitment in variable hydrologic regimes Doug Spieles, Simonne Benoit, Miranda Carter, Melissa Kennedy, and Jackson](https://reader033.vdocument.in/reader033/viewer/2022042202/5ea249f497f66129ef6d94c7/html5/thumbnails/1.jpg)
Seedling recruitment in variable hydrologic regimes
Doug Spieles, Simonne Benoit, Miranda Carter, Melissa Kennedy,
and Jackson Means
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Vegetation establishment in a mitigation wetland
The Gold Standard: rapid establishment of a desirable plant community
What factors are most critical?
Soil quality
Hydrologic regime
Seed bank
Planted Stock
Competition, predation
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Source: Ohio Department of Transportation
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The Dutch Fork Wetlands, 2006
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The Dutch Fork Wetlands, April 2006
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Success and Succession
How does the plant community develop spatially in the first three years?
What biotic and abiotic factors are particularly conducive to successful establishment of the desired plant community?
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Grid point data collection
Soil Bulk Density, Organic Matter, pH (2006, 2008, 2009)
Depth (Hourly, 2006-2009)
Macrophyte richness, cover, diversity, quality; 5m2 (2007-2009)
Seed bank richness, diversity, quality (2008,
2009; select locations)
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Dutch Fork Wetland Macrophytes, 2007-2008
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Dutch Fork Wetland Macrophytes, 2007-2008
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Factors Influencing Establishment of Desired
Community
Seed Bank
Soil Quality
Hydrologic Regime
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Dutch Fork Wetland Macrophytes and Seed Bank, 2008
0
10
20
30
40
50
60
70
80
90
100
Basin 1 Basin 2 Basin 3 Basin 4 Basin 5 Basin 6
Pe
rce
nt
na
tiv
e
Seed Bank Macrophytes
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Dutch Fork Wetland Macrophytes and Seed Bank, 2008
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Basin 1 Basin 2 Basin 3 Basin 4 Basin 5 Basin 6
Ind
icato
r S
tatu
s
Seed Bank Macrophytes
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Dutch Fork Wetland Macrophytes and Seed Bank, 2008
0
20
40
60
80
100
120
Basin 1 Basin 2 Basin 3 Basin 4 Basin 5 Basin 6
Perc
en
t A
nn
ual
Seed Bank Macrophytes
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Dutch Fork Wetland Macrophytes and Seed Bank, 2008
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Macrophyte community
B1 B2 B3 B4 B5 B6
B1 100 50.7 47.2 42.3 41.7 29.2
B2 50.7 100 50.8 34.9 45.5 14
B3 47.2 50.8 100 48.4 48.1 23.6
B4 42.3 34.9 48.4 100 41.9 44.7
B5 41.7 45.5 48.1 41.9 100 32.8
B6 29.2 14 23.6 44.7 32.8 100
Sorensen Similarity Index, 2008
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Sorensen Similarity Index, 2008
Macrophyte Community
Seed Bank B1 B2 B3 B4 B5 B6
B1 1.6 1.9 1.8 2.2 1.5 3.3
B2 3.3 1.9 3.6 2.2 3 3.3
B3 3.2 1.9 3.6 2.1 3 3.2
B4 3.2 1.9 3.6 2.1 3 3.2
B5 1.6 1.9 1.8 2.2 1.5 3.5
B6 1.7 2 1.9 2.3 1.6 3.7
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Observations
Seed bank is significantly more nonnative, facultative, and annual than macrophyte community
Seed bank has not made a large contribution to macrophyte community
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Factors Influencing Establishment of Desired
Community
Seed Bank
Soil Quality
Hydrologic Regime
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Soil Quality
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Soil Quality
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Soil Quality
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The desirable plant
community is not
distributed by soil
condition in the first
3 years
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Factors Influencing Establishment of Desired
Community
Seed Bank
Soil Quality
Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Hydrologic Regime
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Observations
Greater diversity is associated with shallow depths with frequent exposure
Greater floristic quality and lower invasive cover are seen in plots with lower depth variance
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Implications
Constructing and managing for low depth variance in the first three years may be conducive to floristic quality
Surveys for monitoring and evaluation should be spatially explicit
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With thanks to: The Dawes Arboretum Kyle Plummer DU Anderson Endowment Stephanie Chan Xijie Lv DU Research Foundation Caitlin Splawski Jordan Mora