Soil chemical data for Watershed 263 (sewershed in southwest Baltimore City) - Text format

Surface soil metals and nutrients were measured in watershed 263 located in southwest Baltimore City. The 5 cm samples were taken randomly stratified by a landuse/cover classification system in Urban Forest Effects (UFORE) plots. The soils were digested with a strong acid and the following elements were analyzed: Al, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Hg, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, S, Sb, Se, Sr, Ti, V, and Zn. Composite samples (0-5 cm) taken from each plot were air dried, ground and sieved through a 2 mm sieve. The sieved samples were digested at the Baltimore Ecosystem Study and University of Maryland Baltimore County Lab using a nitric extraction technique. A synopsis of the methods is as follows: ~2.0 g of ground, oven-dry soil were ashed at 475 deg C for 4 hours. 10 ml of 7.7N HNO3 were added to soil on a hot plate and brought close to a boil. Samples were filtered using #42 whatman paper. These extracts were sent to the Cornell University Nutrient Analysis Laboratory to determine acid soluble concentrations using an Inductively Coupled Plasma Atomic Admissions Spectrophotometer (ICP). 16. Measurement Techniques and Reliability (Distinguish between field measurements, laboratory measurements, and data derived from remote sensing, collected from other sources, or predicted (e.g. on the basis of numerical modeling, logistic regression, kriging, etc.) Field measurements: tree_cover, shrub_cover, plantable_space, building, cement, tar, impervious, main_grass, unmain_grass, duff, bare, pervious_rock, herb, water, soil_type, Lab measurements: Hg, Al, P, S, Ti, Mn, Fe, Co, Ni, Cu, Mo, Pb, Cd, Na, Mg, K, Ca, As, V, Cr, Zn, B, Sr, Li, Be, Se, Sb, Ba Remote sensing measurements (which includes ground truthing): Landuse, ecotope_land_use, ecotope