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NNM-1
 
View of site 1
Typical crust at site 1 |
Navajo National Monument, Navajo County, Arizona, USA. 36° 41.118’ N
latitude, 110° 32.417’ W longitude, elevation 7352
feet.
Slickrock pockets on south side of trail to Keet Seel, in Betatakin segment of park. Date
of sampling 15 May 1999.
Dominant vascular plants at the site: Pinus edulis, Juniperus osteosperma,
Gutierrezia sarothrae, Yucca angustissima, Opuntia polycantha, Cowania mexicana, Artemisia
tridentata, Shepherdia rotundifolia, Allium species, Vulpina octoflora, Oenothera
species.
Mean lichen crust thickness: 12.4 ± 4.7 mm
Mean algal crust thickness: 18.0 ± 10.7 mm
Cover summary:
Type Cover
% Cover
Shrubs
0.4
Annuals
1.2
Perennial grasses 0.0
Perennial forbs 0.8
Algal crust 61.2
Bryophytes
0.0
Lichens
30.8
Bare Soil
5.2
Rock
0.0
Gravel
0.0
Litter
0.8
Cactus
0.0
Chlorophyll a (ng/g): 205.77
N fixation rate (mmol/n2/m2/hr): 12494.51
Soil texture class: loamy sand
NNM-2
 
View of site 2
Typical crust at site 2 |
Navajo National Monument, Navajo County, Arizona, USA. 36° 40.527’ N
latitude, 110° 32.411’ W longitude, elevation 7690
feet.
Deep sandy soils near fenceline at entrance to the Betatakin segment of the park. Mature,
dense pinyon pine stand. Date of sampling 15 May 1999.
Dominant vascular plants in the site: Pinus edulis, Juniperus osteosperma,
Gutierrezia sarothrae, Opuntia polycantha, Scarlet Gilia, Allium species, Artemisia
tridentata, Poa longiligula.
Mean lichen crust thickness: 24.3 ± 8.6 mm
Mean algal crust thickness: 30.8 ± 9.9 mm
Cover summary:
Type Cover % Cover
Shrubs
0.4
Annuals
0.0
Perennial grasses 0.0
Perennial forbs 0.0
Algal crust
48.8
Bryophytes
4.0
Lichens
16.0
Bare Soil
2.0
Rock
0.0
Gravel
0.0
Litter
19.2
Cactus
0.0
Chlorophyll a (ng/g): 3300.22
N fixation rate (mmol/n2/m2/hr): 2995.16
Soil texture class: sandy loam
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