Loblolly Pine Rooting Varies with Microrelief on Wet Sites

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Abstract
Loblolly pine root systems on flat or slightly concave sites had significantly less surface area and dry weight in fine roots (<5 mm) in the top 15 cm of soil than comparable neighbors on low mounds. Surface area of mycorrhizal tips was usually lower on the intermound areas over a 2—year sampling period. Root mapping in soil pits and root washing revealed differences between mound and intermound areas in terms of root numbers, distribution, and condition that indicated the eventual development of deficient root systems and intermittent severe moisture stress on flat sites. These conditions probably contribute to premature tree decline and tree susceptibility to bark beetle attack on such areas.

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