Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 357648
Title Soil chemical properties under kauri (Agathis australis) in The Waitakere Ranges, New Zealand
Author(s) Jongkind, A.G.; Velthorst, E.J.; Buurman, P.
Source Geoderma 141 (2007)3-4. - ISSN 0016-7061 - p. 320 - 331.
Department(s) Laboratory of Soil Science and Geology
Earth System Science
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) pyrophosphate extracts - humus complexes - forest remnants - iron - fe - al - aluminum - oxalate - carbon - forms
Abstract Kauri is known to cause low soil pH and loss of Al from the Al-hydroxy-interlayers from interlayered vermiculite. Kauri is also associated with intense podzolisation and therefore we studied the Al and Fe phases in soil under kauri and under adjacent broadleaf/treefern vegetation for comparison. Kauri accumulates significantly higher amounts of organic matter, which cause a significantly lower soil pH. This lower soil pH under kauri results in increased breakdown of alumino-silicates relative to broadleaf/treefern vegetation. At the same time, the larger amount of organic carbon in soils under kauri causes higher amounts of bound Al and Fe. In Ah-horizons under kauri, sesquioxides appear to be protected by organic matter, which renders them inaccessible to oxalate extraction. The distribution of pyrophosphate-extractable Fe and Al suggests podzolisation, but is due to a combination of transport and local weathering and complexation. The effect of kauri on the soil, as compared to adjacent tree species, appears to be generated by its longevity: large amounts of litter and leachates on one site, rather than its litter quality.
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