Abstract
Abstract Changes in the non-structural carbohydrate content of tillers of snow tussocks (Chionochloa macra from 1590 m, C. rigida from 1220 m and 910 m) transplanted from the Old Man Range, Central Otago, New Zealand, to a site near sea-level in Dunedin were studied during June, July, and August 1979. Decreases in carbohydrate contents of tillers of C. macra, and increases in C. rigida from 910 m, were significantly correlated with increases in temperature and daylength during the period. Tillers of C. rig ida from 1220 m showed little change in carbohydrate content. High winter temperatures, which would maximise respiration and the depletion of carbohydrate reserves, may set a lower altitudinal limit for C. macra.
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