Restoration of Native Shrub/Grass Plant Communities on Xeric Saltcedar Infestation Sites Kenneth D....
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Transcript of Restoration of Native Shrub/Grass Plant Communities on Xeric Saltcedar Infestation Sites Kenneth D....
Restoration of Native Shrub/Grass Plant Communities on Xeric Saltcedar
Infestation Sites
Kenneth D. Lair and Sarah L. WynnTechnical Service Center, Bureau of Reclamation, Denver
ARSAPHISNRCS (PMC)
Saltcedar Biological Control Consortium
_________________________________
San MarcialProject
Site
Saltcedar Revegetation Research Sites
San Marcial, 2002
Cibola, 2003
BBNP, 2004
Monotypic Tamarix ramosissima
Carlsbad, 2004
Lower Rio Grande:• Big Bend National Park (NPS)• Big Bend Ranch State Park (TP&W)• Canon de Santa Elena Protected Area, Mexico• Maderas del Carmen Protected Area, Mexico
Tamarix ramosissimaArundo donaxProsopis spp.Acacia spp.
Mycorrhizal presence = 0
Texture = SCL, CLEC = range 12.8-19.4, µ = 16 mmhos cm-1
SAR = range 16.5-21.2, µ = 19 meq L-1 pH = 8.4OM = 1.1%NO3-N = 1.7 ppmP = 15.2 ppmK = 618 ppm
Mycorrhizal presence = 0
Texture = SCL, CLEC = range 12.8-19.4, µ = 16 mmhos cm-1
SAR = range 16.5-21.2, µ = 19 meq L-1 pH = 8.4OM = 1.1%NO3-N = 1.7 ppmP = 15.2 ppmK = 618 ppm
Broadcast seeding of four custom seed mixtures+ mycorrhizal inoculation
+ soil nitrogen manipulation
Mid-July 2002
HERBICIDE
SHRED / RC
HERB / S / R
C
S / RC / I
MPRINT0.0
10.0
20.0
30.0
40.0
50.0
Freq
uenc
y (%
)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
FREQUENCYDENSITY
Elymus trachycaulusb
aa a
b
aa
a
(LSD = 0.62)
(LSD = 7.6)
P < 0.001
SALTCEDAR TREATMENT
n = 288
NO INOCULATIO
N
GRANULAR
SEED COATING0.0
5.0
10.0
15.0
20.0
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
Dens
ity (p
er s
q. m
eter
)
FREQUENCY DENSITY
Bouteloua curtipendula
a
b
aa
b
b
(LSD = 0.05)(LSD = 2.5)
P < 0.05n = 288
MYCORRHIZAL INOCULATION
SUMMARY OF PRELIMINARY RESULTS(1st Year Data, 2002)
• BOCUNo difference in frequency, density between
treatments (1st year emergence)Emerged plants 30-45 cm, vigorous
• 1st year seed productionPositive mycorrhizal response (both plant
frequency and density)• Granular and seed coating Mycoapply® inoculation
resulted in 1.5-2X frequency and density compared to no mycorrhizae
• No difference between granular and seed coating inoculum