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Total Soil Nitrogen in the Coarse Fraction and at Depth

Univ. of Washington, College of Forest Resources, Box 352100, Seattle, WA 98195

View larger version (19K): [in a new window]   Fig. 1. Locations of 18 soil series sampled throughout Alaska, Oregon, Puerto Rico, and Washington. Each series included three representative profiles for a total of 54 profiles (n = 3 for each series). Series name and profile number are represented by a letter and number designation. For example, the first Athena series profile is labeled At1, the second profile is labeled At2, etc. Map units for each series are listed at the top left. Maps not drawn to scale.

View larger version (38K): [in a new window]   Fig. 2. Average soil total N (Mg ha–1), by soil series, by horizon, and summed for whole profiles.

View larger version (44K): [in a new window]   Fig. 3. Average soil profile depth and horizon thickness sampled for 18 soil series. Thirteen of the 18 series were sampled to a depth >1 m. Percentage of total N found below 1-m depth is shown below each bar.

View larger version (30K): [in a new window]   Fig. 4. (a) Total soil N (Mg ha–1) by quantity contained in the fine and coarse soil fractions with O horizon N included with the fine soil; (b) Soil mass (Mg ha–1) of fine and coarse soil fractions with mass of O horizons included with the fine soil.

View larger version (22K): [in a new window]   Fig. 5. Average percentage of total coarse mineral soil N compared with mineral soil mass of the coarse fraction (O horizons are not included with the exception of the Histosol) (n = 3). Standard deviations are indicated by error bars.