|Data by Research Category|
Dataset: Grama/Mesquite Leaching Mineralization Potential Survey
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.
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.
lab data sheetsMethods:
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.