SOIL TEMPERATURE MEANS 



DEPTH TO 15 CM - LOW ELEVATION 



MOUNDED SCALPED SCARIFIED 



Different letters indicate significant differences (P<0.05) across 

 treatments. 



Figure 3. — Temperature means as af- 

 fected by site treatment over time. 



ble nutrient content of the soil through release of nitro- 

 gen and other nutrients for seedling uptake. Organic 

 matter may also promote ectomycorrhizal development 

 (Harvey and others 1976). Scarified soils had as much 

 organic matter as the mounded treatment. This was 

 probably due to less disturbance in the scarified 

 treatments. 



High organic matter levels also led to low bulk density 

 values in mounded treatments. The low bulk density in 

 the mounded or, to a lesser degree, scarified treatments 

 can be an advantage to newly planted seedlings by per- 

 mitting easier root penetration and by increasing soil 

 porosity. 



Mounding soil has a favorable effect on the soil 

 moisture levels. There is more moisture in mounded and 

 scarified treatments than in scalped treatments. 

 Although not all this moisture is available (Brady 1974), 

 it may contribute to cooler temperatures during dry sea- 

 sons or maintain available water in the rooting zone. The 

 organic matter on the surface may also act as a mulch- 

 ing agent to prevent rapid evaporation of subsurface 

 moisture. 



Creating mounded seedling beds may improve long- 

 term site productivity by increasing organic matter and 

 nutrient concentration. Also, low density and a favorable 



moisture regime will likely increase seedling growth. 

 Growth of planted seedlings, soil properties, and their 

 interactions will be continually monitored for 2 more 

 years. 



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