SNM 1

Sagauro National Monument, Arizona, USA.  32° 18.626' N latitude, 111° 13.136' W longitude.  Date of sampling: 2 July 2000.

Vascular plants at the site:  Brittlebrush, Creosote bush, Chlolla, Chain fruit cholla, Saquaro (rare), Palo verde (rare), Ironwood, Range ratany, Playtopuntia (rare).

Mean lichen crust thickness:
Mean algal crust thickness:

Cover summary:

Type Cover        % Cover
Shrubs                     
Annuals                   
Perennial grasses    
Perennial forbs       
Algal crust             
Bryophytes              
Lichens                   
Bare Soil                   
Rock                          
Gravel                       
Litter                         
Cactus                       
            

Chlorophyll a (ng/g):  349.14
N fixation rate (mmol/n2/m2/hr):  147.39
Soil texture class:

SNM 2

Sagauro National Monument, Arizona, USA.  32° 18.847' N latitude, 111° 09.497' W longitude.  Date of sampling: 2 July 2000.

Vascular plants at the site:  Platyopuntia, Larrea tridentata, Cylindropuntia, Palo verde, Saguaro (rare), White thorn acacia, chain fruit cholla, range ratany, Pencil cholla, Ironwood, Jatropha cardiophylla. 

Mean lichen crust thickness:
Mean algal crust thickness:

Cover summary:

Type Cover        % Cover
Shrubs                     
Annuals                   
Perennial grasses    
Perennial forbs       
Algal crust             
Bryophytes              
Lichens                   
Bare Soil                   
Rock                          
Gravel                       
Litter                         
Cactus                       
            

Chlorophyll a (ng/g):  4556.37
N fixation rate (mmol/n2/m2/hr):  1360.98
Soil texture class:

SNM 3

              View at site 3

Sagauro National Monument, Arizona, USA.  32° 13.958' N latitude, 110° 41.328' W longitude.  Date of sampling: 5 July 2000.

Vascular plants at the site:  Yellow palo verde, creosote bush, staghorn opuntia, Platyopuntia, whitehorn acacia, Zinnia, fishhook cactus, velvet mesquite, Saguaro.

Mean lichen crust thickness:
Mean algal crust thickness:

Cover summary:

Type Cover        % Cover
Shrubs                     
Annuals                   
Perennial grasses    
Perennial forbs       
Algal crust             
Bryophytes              
Lichens                   
Bare Soil                   
Rock                          
Gravel                       
Litter                         
Cactus                       
            

Chlorophyll a (ng/g):  5500.73
N fixation rate (mmol/n2/m2/hr):  906.03
Soil texture class:

SNM 4

Sagauro National Monument, Arizona, USA.  32° 11.931' N latitude, 110° 44.152' W longitude.  Date of sampling: 5 July 2000.

Vascular plants at the site:  Staghorn opuntia, yellow palo verde, Mammalaria, Platyopuntia sp., Zinnia, Christmas cactus, Brittlebrush, fishook cactus.

Mean lichen crust thickness:
Mean algal crust thickness:

Cover summary:

Type Cover        % Cover
Shrubs                     
Annuals                   
Perennial grasses    
Perennial forbs       
Algal crust             
Bryophytes              
Lichens                   
Bare Soil                   
Rock                          
Gravel                       
Litter                         
Cactus                       
            

Chlorophyll a (ng/g):  3150.42
N fixation rate (mmol/n2/m2/hr): 
Soil texture class:

SNM 5

Sagauro National Monument, Arizona, USA.  32° 12.679' N latitude, 110° 43.557' W longitude.  Date of sampling: 5 July 2000.

Vascular plants at the site:  Platyopuntia sp., Chain fruit cholla, Zinnia sp., Saguaro, Staghorn Cholla, Mammalaria, Acacia sp., bitter candina, Palo verde, Ephedra, Pencil cholla.  

Mean lichen crust thickness:
Mean algal crust thickness:

Cover summary:

Type Cover        % Cover
Shrubs                     
Annuals                   
Perennial grasses    
Perennial forbs       
Algal crust             
Bryophytes              
Lichens                   
Bare Soil                   
Rock                          
Gravel                       
Litter                         
Cactus                       
            

Chlorophyll a (ng/g):  3129.26
N fixation rate (mmol/n2/m2/hr):  898.54
Soil texture class: