Abstract
The changes in nutrient and starch concentrations in live and dead roots were studied as a part of a research project concerned with the dynamics of fine root production and turnover in a Pinusradiata (D. Don) plantation. The study period of 30 months included a year of severe drought, followed by a year of more than average rainfall. Nutrient concentrations were strongly related to root diameter. Monthly variations in nutrient concentrations in fine roots were minor and showed no seasonal pattern. This was in contrast with large seasonal fluctuations in starch concentrations in roots. Prolonged drought also had only minor effects on nutrient concentrations in roots. These results and the absence of significant difference in N, P, K, and Mg concentrations between live and dead roots suggest that there is little retranslocation of nutrients from senescent roots of Pinusradiata.
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