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The North American long-term soil productivity experiment: Findings from the first decade of research |
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| Authors: | Robert F Powers D Andrew Scott Felipe G Sanchez Richard A Voldseth Deborah Page-Dumroese John D Elioff and Douglas M Stone |
| Institution: | aUSDA Forest Service, Pacific Southwest Research Station, 3644 Avtech Parkway, Redding, CA 96002, USA bUSDA Forest Service, Southern Research Station, 2500 Shreveport Highway, Pineville, LA 71360, USA cUSDA Forest Service, Southern Research Station, P.O. Box 12254, Research Triangle Park, NC 27709, USA dUSDA Forest Service, North Central Research Station, 1831 East Highway 169, East Grand Rapids, MN 55744, USA eUSDA Forest Service, Rocky Mountain Research Station, 1221 South Main, Moscow, ID 83843, USA fUSDA Forest Service, USA |
| Abstract: | First decade findings on the impacts of organic matter removal and soil compaction are reported for the 26 oldest installations in the nation-wide network of long-term soil productivity sites. Complete removal of surface organic matter led to declines in soil C concentration to 20 cm depth and to reduced nutrient availability. The effect is attributed mainly to the loss of the forest floor. Soil C storage seemed undiminished, but could be explained by bulk density changes following disturbance and to decomposition inputs of organic C from roots remaining from the harvested forest. Biomass removal during harvesting had no influence on forest growth through 10 years. Soil compaction effects depended upon initial bulk density. Soils with densities greater than 1.4 Mg m?3 resisted compaction. Density recovery was slow, particularly on soils with frigid temperature regimes. Forest productivity response to soil compaction depended both on soil texture and the degree of understory competition. Production declined on compacted clay soils, increased on sands, and generally was unaffected if an understory was absent. |
| Keywords: | LTSP Soil compaction Harvesting impacts Sustained productivity Biomass Carbon |
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