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Elevation-Based Soil Sampling to Assess Temporal Changes in Soil Constituents

^a Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Ave. S. Lethbridge, AB, T1J 4B1, Canada

View larger version (17K): [in this window] [in a new window]   Fig. 1. Three possible temporal changes, from t = 1 to t = 2, in a soil profile: (I) no change in volume or mass, (II) increase in surface elevation, and (III) decrease in surface elevation.

View larger version (40K): [in this window] [in a new window]   Fig. 2. Contour in the experimental area, treatment, and plot layout in 2005.

View larger version (15K): [in this window] [in a new window]   Fig. 3. Relationship between relative elevations determined in 1990 and in 2005 for the 21 wells at the experimental site.

View larger version (46K): [in this window] [in a new window]   Fig. 4. Comparison of three approaches to extimate change in soil C from 1973 to 2003: (a) fixed depth of 60 cm, (b) fixed soil mass 7950 Mg ha–1, and (c) fixed subsurface elevation for the example with surface elevation increasing by 24 cm. BD = bulk density, OC = organic carbon.