hoop pine


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hoop pine

a fast-growing timber tree of Australia, Araucaria cunninghamii, having rough bark with hoop-like cracks around the trunk and branches: family Araucariaceae
References in periodicals archive ?
Soil C and N concentrations under hoop pine plantations were almost uniformly distributed across all 4 aggregate fractions (Fig.
Following the dispersion of water-stable aggregates, iPOM in the top 0.1 m of soil was significantly (P<0.05) higher under pasture and rainforest than the 25- and 63-year hoop pine plantations, and rainforest iPOM content was higher than the 50-year hoop pine plantation (Table 1).
Soil under the 63-year hoop pine plantation had significantly (P<0.05) higher concentrations of [Fe.sub.d-o] at all depths than the other sites (Table 2).
In contrast, the [Fe.sub.o]/[Fe.sub.d] ratio was strongly and positively correlated with total soil C at all sites except the 25-year hoop pine plantation (Fig.
In our study we cannot rule out that differences in rates of C input and changes to soil properties during site preparation and thinning have contributed to the reduced C storage in the top 0.3 m under most hoop pine plantations, compared with rainforest and pasture.
The greater concentration of iPOM under pasture and rainforest indicates that SOC is protected to a greater extent within aggregates than in the hoop pine soils, which are dominated by C associated with silt- and clay-sized particles (<53 [micro]m).
If this is also the case for plantations, then it appears that hoop pine soils, with greater proportions of total C in imSOC fractions, are dominated by a pool of old stabilised C protected by silt- and clay-sized particles, whereas physical protection of SOC in larger aggregates may not be an important mechanism for SOC stabilisation.
The greater storage of C within aggregates in pasture and rainforest soil, compared with hoop pine plantations, may be due to different root characteristics.
Pu GX, Saffigna PG, Xu ZH (2001) Denitrification, leaching and immobilisation of [sub.15]N-labelled nitrate in winter under windrowed harvesting residues in hoop pine plantations of 1-3 years old in subtropical Australia.