Suppression of nitrate formation within an exotic conifer plantation |
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Authors: | A Bryce Cooper |
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Institution: | (1) Water Quality Centre, Ministry of Works and Development, Private Bag, Hamilton, New Zealand |
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Abstract: | Summary 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. |
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Keywords: | Allelopaths Andept Mineralization Nitrate formation Nitrifiers Pasture Pines |
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