JO1

  
                          View at site 1                                                           Typical crust at site 1

Jornada Experimental Range, Creosote-sand site, Dona Ana Co., New Mexico, USA.    32° 30.955'N latitude, 106° 47.338' W longitude, elevation 4190 ft.  Very sparsely crusted area just downslope of the study site.  Date of sampling:  17 July 1998.

Dominant vascular plants at site:  Larrea tridentata, Fluff grass

Mean thickness of algal crust: 4.75 mm
Mean thickness of lichen crust:  15 mm

Cover summary:

Type Cover              % Cover
Shrubs                           4.8
Annuals                        0.0
Perennial grasses        4.8
Perennial forbs            0.0
Algal crust                  10.8
Bryophytes                   0.0
Lichens                          1.2
Bare Soil                      74.0
Rock                               1.2
Gravel                            0.8
Litter                              2.4
Cactus                            0.0

Chlorophyll a (ng/g): 239.81
N fixation rate (mmol/n2/m2/hr): 93.34
Soil texture class:  loamy sand / sandy loam

JO1.5

     
                        View at site 1.5                                                  Typical crust at site 1.5  

Jornada Experimental Range, Dona Ana Co., New Mexico, USA.  Upslope from JO1, 32° 30.844'N, 106° 48.075'W, elevation 4440 ft.. A Black gramma grassland just below the steep rocky mountain. Site called Summerfield Grassland site (G-SUM).  This is essentially an uncrusted site, but some soil lichens and mosses near junction of bajada and steep rocky slope.  Soil not sampled.

Bryophyte taxa

JO2

  
                        View at site 2                                                         Typical crust at site 2

Jornada Experimental Range, Dona Ana Co., New Mexico, USA.  32° 30.938' N latitude, 106° 44.475' W longitude; elevation 4390 feet.  Date of sampling:  17 July 1998.

Dominant vascular plants at site:   Flourensia cernva, Sclenopogon brevifolius

Other vascular plants:  Opuntia, Ephedra, Grass

Mean thickness of algal crust:  5.8 mm
Mean thickness of lichen crust:  9.4 mm

Cover summary:

Type Cover               % Cover
Shrubs                             1.6
Annuals                          0.0
Perennial grasses        32.0
Perennial forbs              0.0
Algal crust                    48.4
Bryophytes                     0.0
Lichens                            8.4
Bare Soil                          3.2
Rock                                0.0
Gravel                             0.0
Litter                               6.4
Cactus                             0.0

Chlorophyll a (ng/g): 1582.90
N fixation rate (mmol/n2/m2/hr): 638.19
Soil texture class:  sandy loam

JO3

Jornada Experimental Range, Dona Ana Co., New Mexico, USA.  Date of sampling:  18 July 1998.

Mean thickness of algal crust:  4.8 mm
Mean thickness of lichen crust:  16.8mm

Chlorophyll a (ng/g): 1781.01
N fixation rate (mmol/n2/m2/hr): 
Soil texture class: