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Enrichment over Time of Organic Carbon and Available Phosphorus in Semiarid Soil

^a Dep. of Biological Sciences, Idaho State Univ., Pocatello, ID 83209-8007
^b Idaho National Lab., P.O. Box 1625, Idaho Falls, ID 83415-2203
^c Currently at: Dep. of Botany, Brandon Univ., Brandon, MB R7A 6A9, Canada

View larger version (45K): [in a new window]   Fig. 1. Schematic diagram of cap designs at the Protective Cap Biobarrier Experiment. Designs were 2 m of soil without or with a gravel and cobble biobarrier below the top 0.5 or 1.0 m of soil, or instead with an impermeable barrier (IB) in the form of a plastic membrane below 1 m of soil and above 0.6 m of clay.

View larger version (17K): [in a new window]   Fig. 2. A schematic diagram of the arrangement of treatments within one replicate. The four cap designs were applied at random to the four 16 x 24 m plots of the replicate, which are shown as four separate columns. The three irrigation treatments were applied at random as strips corresponding to the three rows in the diagram. Then, each of the twelve combinations of cap design and irrigation in the replicate were divided into two split plots, and to each pair the vegetation treatments native species mix (N) and grass (G) were allocated at random. An example of a randomization is shown. Each of the replicates was re-randomized. The smallest cells in the diagram each correspond to a split plot of 8 x 8 m.

View larger version (43K): [in a new window]   Fig. 3. Soil (a) organic C and (b) available P in the Protective Cap Biobarrier Experiment in relation to vegetation type, location, and depth. Means with different letters are significantly different at the 5% probability level; n = 36. Bars with no letters have abcd omitted for clarity.

View larger version (35K): [in a new window]   Fig. 4. Soil (a) organic C and (b) available P in the Protective Cap Biobarrier Experiment in relation to irrigation and depth. Means with different letters are significantly different at the 5% probability level; n = 48.

View larger version (44K): [in a new window]   Fig. 5. Soil (a) organic C and (b) available P in the Experimental Breeder Reactor-1 plots in relation to vegetation type, location, and depth. Means with different letters are significantly different at the 5% probability level; n = 6. Bars with no letters have abcd omitted for clarity.