Soil chemical data for Baltimore City - UFORE

Soils were sampled in 126 plots located within the City of Baltimore in the summer of 2000. The plots were randomly stratified by Anderson Land Cover Classification System Level II, which included commercial, industrial, institutional, transportation right-of-ways, high and medium density residential (there were no low density residential areas identified within the city boundaries), golf course, park, urban open, forest, and wetland land-use types. The number of plots situated in each land-use type was weighted to their proportion of spatial area within the City. The resultant number of plots sampled for soil by land-use type was: commercial (n = 2); industrial (n = 3); institutional (n = 10); transportation right-of-ways (n = 7); high density residential (n = 19); medium density residential (n = 33); golf course (n = 3); riparian (n=2); park (n = 10); urban open (n = 10); and forest (n = 26) land-use types, respectively. The distribution of plots represents the proportion of area covered by impervious surfaces.2000年夏季，研究人员于美国巴尔的摩市境内的126个样地中采集土壤样本。 所有样地均基于安德森土地覆盖分类系统二级分类（Anderson Land Cover Classification System Level II）开展随机分层布设，该分类体系涵盖商业用地、工业用地、机构用地、交通通行权用地、高密度住宅区、中密度住宅区（巴尔的摩市市域范围内未划定低密度住宅区）、高尔夫球场、公园、城市开放空间、林地及湿地共11类土地利用类型。 各土地利用类型的样地数量依据其在巴尔的摩市的空间面积占比进行加权配置。 最终各类土地利用类型对应的土壤采样样地数量分别为：商业用地（n=2）、工业用地（n=3）、机构用地（n=10）、交通通行权用地（n=7）、高密度住宅区（n=19）、中密度住宅区（n=33）、高尔夫球场（n=3）、河岸带用地（n=2）、公园用地（n=10）、城市开放空间（n=10）及林地（n=26）。 本次布设的样地分布格局可反映研究区域内不透水面的面积占比特征。