Plant and Soil

, Volume 93, Issue 3, pp 383–394 | Cite as

Suppression of nitrate formation within an exotic conifer plantation

  • A. Bryce Cooper


Nitrate-N losses to stream waters and soil inorganic N pools, nitrifying potentials and NO3-N production rates were measured in 2 adjacent watersheds, one used as pasture and the other planted in exotic conifer forest (Pinus radiata D. Don). Estimated NO3-N loss to stream waters draining the pine and pasture watersheds were 0.6kg ha−1 y−1 and 7.6 kg ha−1 y−1 respectively. Ammonium-N pool sizes were not significantly different between soils in the two watersheds but NO3−N pools and nitrifying potentials were always lower in the pine watershed soil samples. Laboratory incubation experiments indicated that suppression of NO3−N formation in pine watershed soils required the presence of live tree roots and was not due to the direct action of allelopathic chemicals on nitrifiers.

Key words

Allelopaths Andept Mineralization Nitrate formation Nitrifiers Pasture Pines 


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Copyright information

© Martinus Nijhoff Publishers 1986

Authors and Affiliations

  • A. Bryce Cooper
    • 1
  1. 1.Water Quality CentreMinistry of Works and DevelopmentHamiltonNew Zealand

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