Yarding-Method and Slash-Treatment Effects on Compaction, Humus, and Variation in Plantation Soils

摘要

Soil penetration-resistance and soil-humus frequency were measured on 86 progeny-test plantations in southwestern Oregon to determine the effects of yarding method and slash treatment on soil compaction and humus, and a disturbance index was calculated for each plantation. Compaction and humus loss were more severe on tractor-yarded machine-piled plantations than on cable-yarded, broadcast-burned plantations. Machine piling and burning of slash did not increase compaction or humus loss significantly more than broadcast burning on tractor-yarded plantations.