Conifer regeneration failure in New Zealand: dynamics of montane Libocedrus bidwillii stands |
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Authors: | Glenn H Stewart Alan B Rose |
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Institution: | (1) Forestry Research Centre, Forest Research Institute, Box 31-011, Christchurch, New Zealand |
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Abstract: | Size and age structure analysis were used to reconstruct the population dynamics of six apparently old and stable stands dominated by the conifers Libocedrus bidwillii and/or Dacrydium biforme in Camp Creek, Westland, New Zealand. All stands contained relatively even-aged groups of Libocedrus that had probably originated after either mass movement or windthrow. The age distributions of stands reflected the effects of disturbances 200–400 yr ago.There was no evidence to support synchronous failure of regeneration of Libocedrus and Dacrydium biforme. Between 1600 and 1800 A.D., the period of the postulated conifer regeneration gap, over 70% of trees of these species had established. A lack of Libocedrus regeneration over the last 200 yr reflects a lack of disturbance over that time. Because of the dominating influence of disturbances and other factors it may be inappropriate to use tree population structures alone to substantiate or refute claims of recent climate change. |
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Keywords: | Age structure Climate change Conifer regeneration gap Dacrydium biforme Disturbance Forest dynamics Size structure Westland |
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