Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
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.
There are no comments yet. You can post the first one!
Post a comment
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.