The soils are classified as Red Dermosols, along the upper
slopes, and Red Kurosols on the midslopes (Isbell, 1998), all
derived from metasediments with moderate to low fertility. These
soils have a light clay A horizon (pH (H2O) 5.5) and light medium
clay B1 and B2 horizons (pH (H2O) of 5). The soils have very low
P availability, with Bray I–P concentration of 1–2 mg kg1
(0–25 cm depth), and low cation exchange capacity (4.5–
9.5 meq/100 g; 0–25 cm depth) (see Ulong soil landscape in
Milford (1999)). The native site vegetation is mixed dry eucalypt
forest containing many eucalypt species including E. grandis and
E. pilularis. Site quality was relatively low with mean annual volume
increment of monocultures (2500 trees ha1) at age 10 years
estimated to be 10.8 for E. pilularis and 9.1 m3 ha1 year-1 for
E. grandis. Seedlings were planted in January 1982.
The soils are classified as Red Dermosols, along the upperslopes, and Red Kurosols on the midslopes (Isbell, 1998), allderived from metasediments with moderate to low fertility. Thesesoils have a light clay A horizon (pH (H2O) 5.5) and light mediumclay B1 and B2 horizons (pH (H2O) of 5). The soils have very lowP availability, with Bray I–P concentration of 1–2 mg kg1(0–25 cm depth), and low cation exchange capacity (4.5–9.5 meq/100 g; 0–25 cm depth) (see Ulong soil landscape inMilford (1999)). The native site vegetation is mixed dry eucalyptforest containing many eucalypt species including E. grandis andE. pilularis. Site quality was relatively low with mean annual volumeincrement of monocultures (2500 trees ha1) at age 10 yearsestimated to be 10.8 for E. pilularis and 9.1 m3 ha1 year-1 forE. grandis. Seedlings were planted in January 1982.
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