restoration of native shrub/grass plant communities on xeric saltcedar infestation sites kenneth d....
DESCRIPTION
San Marcial Project Site Saltcedar Revegetation Research Sites San Marcial, 2002 Cibola, 2003 BBNP, 2004 Monotypic Tamarix ramosissima Carlsbad, 2004TRANSCRIPT
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
