Data set ID:
Soil samples collected 5/12 and 5/13/86 to survey N availability in a variety of grassland and mesquite habitats. Objective is development of hypotheses about desertification processes that degrade grassland into mesquite dominated ecosystems. Measurements made of inorganic soil nitrogen.
lab data sheets
Depth to Site Hard Pan* Number ---- -------- ------ MD-USDA: Mesquite dunes >20 1-10 BD-USDA: Between dunes 5-10 11-20 GG-IBP: Grama grassland exclosure >20 21-30 GG-USDA: Grama grassland grazed ~15 31-40 AM-LTER: Arroyo mesquite >20, 10-15 41-50 FG-LTER: Fluff grass LTER ~10 51-60 GG-LTER: Grama grassland LTER ~10 61-70 PM-LTER: Playa mesquite >20, 10-15 71-80 SG-USDA: Sporobolus/Gutierrezia Clumps >20 81-90 MG-USDA: Mesquite-grassland >20 91-100 *Soil samples collected to 20 cm or to hard pan, whichever came first. Fluff grass LTER - Lower grassland on control transect - samples collected from fluff grass clumps. Grama grassland LTER - Upper grassland in control transect - samples collected from black grama clumps. Sporobolus/Gutierrezia Clumps - Collected in mesquite grassland. Sporobolus and Gutierrezia were dominant plants. Mesquite was increasing. Located just SE of IBP grassland site. Samples collected from Sporobolus/Gutierrezia clumps. Grama grassland - Samples collected within clumps of black grama. Playa mesquite - Soils were mostly clay, but a few samples were quite coarse and had a hardpan at 10-15 cm. Arroyo mesquite - Samples were generally loamy and had no detectable hardpan. A few had hardpans at 10-15 cm.
LTER-I control transect arroyo on Mt. Summerford bajada. USDA Jornada Experimental Range near IBP desert grassland site. Fluff grass LTER - Lower grassland on control transect. Grama grassland LTER - Upper grassland in control transect. Sporobolus/Gutierrezia Clumps - Collected in mesquite grassland. Located just SE of IBP grassland site. Grama grassland. Playa mesquite. Arroyo mesquite.