Plant Ecology of Subalpine Shingle River-Beds in Canterbury, New Zealand

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Abstract
A study of the habitat and vegetation of the Cass river-bed has provided a greater understanding of the course and forces controlling succession from the bare shingle to tussock grassland. Three distinct stages in the succession are recognised: the Epiloblum stage, the Raoulia stage and finally, the Dlscaria shrub stage. The distribution of species within any one of these stages is largely dependent on the availability of ground water; the succession on dry areas differing in detail from the succession on areas where the watertable is near the surface. A comparison of the subalplne shingle river-bed vegetation with the vegetation of lowland river-beds suggests that the two habitats are related but distinct..

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