The average index of penetration ratio to root length of seedlings of both alder and maple species on skid trails showed an increasing trend with increasing age of the skid trails ( Figure 3 ).
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The Influence of Logging-Related Soil Disturbance on Pioneer Tree Regeneration in Mixed Temperate Forests.
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The sentences
The average main root-to-stem ratio index (MRL/SL) of alder seedlings on skid trails showed a decreasing trend with increasing age of the skid trail, while this ratio had a constant trend for maple seedlings ( Figure 2 ).