Figure 4.

Kriged maps of roots less than 1 mm in diameter (FRD, number of root intersects counted in a 25 cm² area of trench wall) on the P0 soil profile. Pits were at right angles to planting rows in a chronosequence of Eucalyptus grandis plantations down to a depth of 6 m at 1 and 2 years after planting (A and B, respectively) and down to a depth of 10 m in 3.5-year old (C) and 6-year-old (D) stands on a sandy soil (20% clay). Fine root densities down to a depth of 10 m in a 6-year-old stand on a clayey soil were also studied (E). Eucalypts indicate the position of the nearest tree (not at the scale of soil profiles).