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
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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.
d] ratio was strongly and positively correlated with total soil C at all sites except the 25-year hoop pine plantation (Fig.
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.
17 g C/g Fe under the 63-year hoop pine plantation at 0.
In summary, our study provides evidence that greater SOC storage under native rainforest and pasture, compared to hoop pine plantations, may be largely due to stabilisation in soil aggregates rather than via sorptive preservation through organo-mineral interactions.
Mathers NJ, Xu ZH, Blumfield TJ, Berners-Price SJ, Saffigna PG (2002) Composition and quality of harvest residues and soil organic matter under windrow residue management in young hoop pine plantations as revealed by solid-state [sup.
15]N-labelled nitrate in winter under windrowed harvesting residues in hoop pine plantations of 1-3 years old in subtropical Australia.