Abstract
Two soil development sequences in a montane area of Canterbury were studied with a view to determining quantitative data on phosphorus (P) transformations in soils formed in geologically layered parent materials. Data from soil P fractionation are presented. The results are discussed in terms of changes in P content from that of the “initial state” of each individual soil profile. All soils have undergone a net loss of P. Soils in the low rainfall area show a trend of increasing P loss with increasing soil development, whereas soils in the higher rainfall area show trends related to differences in vegetation history. The results indicate that contrasting pathways of soil P transformation are followed by soils in low and high rainfall areas. Soils in the low rainfall area show increasing losses of P from B horizons with increasing soil development. Soils in the high rainfall area show a pattern of net gain and subsequent loss of P from the B horizon. Acid extractable P is transformed rapidly to secondary forms relative to the rate of loss of P during soil development.
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