Restoration of Disturbed Pond-cypress Savannas, Big Cypress National ... · Restoration of...
-
Upload
vuongkhanh -
Category
Documents
-
view
218 -
download
0
Transcript of Restoration of Disturbed Pond-cypress Savannas, Big Cypress National ... · Restoration of...
U.S. Department of the InteriorU.S. Geological Survey
Restoration of Disturbed Pond-cypress Savannas, Big Cypress National PreserveJames R. SnyderUSGS, Florida Integrated Science Center
G. Ronnie BestUSGS, Greater Everglades PES
Susan Vince
Big Cypress National Preserve
Approximately 730,000 acres in southwest FloridaSubsurface mineral rights privately ownedTwo active oil fields in Big Cypress and interest in further exploration
Pond-cypress savanna
Cypress savanna a common habitat with high likelihood of disturbanceCharacterized by stands of pond-cypress with well-developed, graminoid herb layer
Ranges from very open stands of stunted cypress with sparse herb layer to more dense stands of larger treesHerb layer composed of short-hydroperiod wet prairie species
Covers nearly 50% of Big Cypress Nat. Pres.
Cypress Savanna
Pond-cypress, Taxodium ascendens
Restoration question
How to re-establish cypress savanna on sites disturbed by oil development
Experimental design
Three substratesResidual limerock fillCommercially available sand fillSurface soil from local quarry operation
Three revegetation treatmentsPlanted 10 native speciesSpreading of donor mulch materialControl, or passive revegetation
Bass
Patten
Capelletti
Sand Limerock SoilI II II II II II II II I
--- Border of substrate
2x2m planting and sampling subplot
Planted
Control
Mulch
10 m
20 m
Fill pad removal at Capelletti site
Spreading sand substrate
Site preparation complete
Capelletti site after mulch treatment
Capelletti site
SandLimerock
Soil
MulchMulch
Mulch
Patten site
Sand
LimerockSoil
MulchMulch
Mulch
Bass 5-2 site
Sand
Limerock
Soil
Mulch
Mulch
Mulch
Propogation method
Planting density
Scientific name Common name (no./m²)
TreeTaxodium ascendens Pond-cypress seed germination 0.25
ShrubMyrica cerifera Wax myrtle seed germination 0.125Stillingia aquatica Corkwood field collection 0.125
ForbPluchea rosea Rosy camphorweed field collection 0.25
GrassMuhlenbergia filipes Gulfhairawn muhly vegetative division 1.0Paspalum monostachyum Gulfdune paspalum field collection 1.0Schizachyrium rhizomatum Florida little bluestem field collection 1.0
SedgeDichromena colorata Starrush whitetop vegetative division 1.0Rhynchospora divergens Spreading beaksedge seed germination 1.0Rhynchospora microcarpa Southern beaksedge seed germination 1.0
Species
Species used in planted revegetation treatment
Planting at Capelletti site July 1989
Planting treatment in progress
Planting at Capelletti site
GEER 2008 Co-chair
Capelletti site at establishment, July 1989
Sampling effort
Species composition and percent cover estimated 1/90, 6/90, 1/91, 5/91, 5/92, and 5/04
Sampled one 0.1 m2 quadrat per 2x2 m cell, 50 samples per treatment
Cypress heights measured 1/90, 5/90, 1/91, 5/91, 5/92, 7/93, 4/95, 6/00, 6/03, and 5/08
DBH measured beginning in 6/03 and trees tagged
Preparing to sample at end of first wet season
Capelletti sand planted plot 6 months
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
Mean Survival of Planted Species
Survivorship of planted cypress trees
0
20
40
60
80
100
0 5 10 15 20
Perc
ent
Years after planting
Planted Pond-cypress Survival
0.0
100.0
200.0
300.0
400.0
500.0
600.0
0.0 5.0 10.0 15.0 20.0
Hei
ght
(cm
)
Age (years)
Bass
Limerock
Sand
Soil
0.0
100.0
200.0
300.0
400.0
500.0
600.0
0 5 10 15 20
Hei
ght
(cm
)
Age (years)
Patten
Limerock
Sand
Soil
0.0
100.0
200.0
300.0
400.0
500.0
600.0
0 5 10 15 20
Hei
ght
(cm
)
Age (years)
Capelletti
Limerock
Sand
SoilHeight growth of planted pond-cypress
Planted pond-cypress
Nineteen years after planting, tallest tree just over 7 m tallTen trees had DBH >10 cmLargest diameter 14.8 cmBest growth in soil substrate at Patten site
0
50
100
150
200
250
300
350
400
450
500
Bass 5-2 Patten Capelletti
Cypress recruitment by treatment
Control Mulch Planted
Recruitment of pond-cypress after 14 years
0
50
100
150
200
250
300
350
400
450
Bass 5-2 Patten Capelletti
Cypress recruitment by substrate
Sand Soil Limestone
Recruitment of pond-cypress after 14 years
Capelletti sand planted treatment year one, 6/1990
Capelletti sand planted treatment year three, 6/1992
Capelletti sand planted treatment year fifteen, 6/2004
Capelletti limerock planted 2008
Bass soil planted 2008
Undisturbed cypress savanna
Number of species in herb layer ranged from 22 to 40 at the three sites and averaged 29 species
Cover ranged from 20.5 to 41.2 and averaged 30.4 %
Number of species year 15
Limerock Sand Soil
26 24
3328
3935
13
22
37
BassControl Mulch Planted
Limerock Sand Soil
16
2528
18
31
43
16
2630
PattenControl Mulch Planted
Limerock Sand Soil
2318
35
27 25
50
25 26
37
CapellettiControl Mulch Planted
Limerock Sand Soil
21.7 22.3
32.0
24.3
31.7
42.7
18.0
24.7
34.7
Mean all sitesControl Mulch Planted
Percent cover of all treatments year 15
0
10
20
30
40
50
60
70
80
Limerock Sand Soil
Perc
ent c
over
Bass
Control
Mulch
Planted
0
10
20
30
40
50
60
Limerock Sand Soil
Perc
ent c
over
Patten
0
10
20
30
40
50
60
70
80
90
Limerock Sand Soil
Perc
ent c
over
Capelletti
0
10
20
30
40
50
60
Limerock Sand Soil
Perc
ent c
over
Mean all sites
Control
Mulch
Planted
Winners and losers after 15 years
Fate of planted species mixedSome disappeared
Muhly and bluestem grasses goneWax myrtle nearly absent
Some did very wellPaspalum was a dominant species in the planted treatments but uncommon elsewhereCypress and corkwood were common on all treatments
Pluchea had greater frequency in mulched plots than planted plots Sedges variable and not restricted to planted plots
Several species are common on study plots but not in undisturbed cypress savanna
Bacopa caroliniana, Eleocharis baldwinii, and E. cellulosa are good examples Phragmites australis on soil at Patten siteMany introduced via mulch or substrates
Only one non-native species significantPanicum repens on sand at Capelletti
How to restore?
Fifteen years after treatments applied, all fall within range of native cypress savanna in terms of cover and species richness
“Best” method not clearPlanting clearly established some of the dominant speciesMulch treatment introduced high diversity of species but not necessarily local dominantsPassive revegetation worked reasonably well but benefited from proximity to seed sourcesSoil substrate was best but others were satisfactoryPending multivariate analyses will help clarify trajectories of species composition
Acknowledgements
• Pete Sleszynski did the plant propagating and seed bank work among other things
• Pete Roth, NPS, was the master heavy equipment operator who set up plots
• Numerous field assistants from UF Center for Wetlands helped with planting
• Lisa Spier, John DeLapp, Renee Beymer, Sara Robinson, Robin Keith, and TJ Hilton assisted with data collection
• Funding was provided by the National Park Service
Capelletti site three years after establishment