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Soil nitrogen mineralization in a coastal fynbos succession

W.D. STOCK, O.A.M. LEWIS and N. ALLSOPP
Plant and Soil
Vol. 106, No. 2 (February (II), 1988), pp. 295-298
Published by: Springer
Stable URL: http://www.jstor.org/stable/42937404
Page Count: 4
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Soil nitrogen mineralization in a coastal fynbos succession
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Abstract

Patterns of net nitrogen mineralization and nitrification in 0-7.5 cm deep mineral soils of different stages (serai ages 1, 6 and 20 years) of a post-fire coastal fynbos succession were assayed using laboratory and in situ incubations. No evidence of increasing allelopathic inhibition of nitrification with successional development was found as NO₃-N was the predominant product at all serai stages and the NO₃-N:NH₄-N ratio remained constant. Rather the results of field incubations of soils beneath Protea repens stands of different successional ages showed that increased mineralization and nitrification appeared to be associated with increased soil total N content rather than with successional age. Further, the incubation of soils in situ during the dry summer months showed that NO₃-N production appears to be closely related to temperature and soil moisture content, both of which are variables that vary throughout succession due to the changing structure of the vegetation.

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