منابع مشابه
Forest Instability and Canopy Tree Mortality in Westland, New Zealand!
Many researchers in New Zealand have accepted equilibrium models of vegetation change that assume within-stand self-replacement of the dominant tree species as the norm. Consequently, many discontinuous stand structures have been used as evidence of forest instability. For example, the patterns of regeneration and mortality in the rata-kamahi forests of Westland have led many to believe that th...
متن کاملCanopy Closure, a Factor in Rata (metrosideros)-kamahi (weinmannia) Forest Dieback in Westland, New Zealand
Increased dieback in Westland rata (Metrosideros umbellata) kamahi (Weinmannia racemosa) forests has been linked to the build-up of populations of the Australian brush-tailed possum (Trichosurus vulpecula). Within these forests young even-aged stands are observed to be more resilient to dieback than older stands. The effect of possum browsing on individual rata trees was related to the level of...
متن کاملStructure and canopy tree species regeneration requirements in indigenous forests, Westland, New Zealand
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متن کاملPossum (trichosurus Vulpecula) Densities and Impacts on Fuchsia (fuchsia Excorticata) in South Westland, New Zealand
New Zealand Journal of Ecology (1998) 22(2): 197-203 ©New Zealand Ecological Society possums (Pekelharing and Batcheler, 1990), the palatability of the plant species relative to others in the area (Brockie, 1992; Allen, Fitzgerald and Efford, 1997), the species composition and age structure of the plant population (Payton, 1987, 1988), other environmental stresses (Stewart and Veblen, 1982), pl...
متن کاملImpact of cattle on conservation land licensed for grazing in South Westland, New Zealand
Making use of existing fences as ready-made exclosures, this study aimed to assess the long-term effects of cattle grazing on forest margins. Results indicated: 1) that cattle browsing and trampling has an impact on vegetation species composition, structure and regeneration; 2) that the effects of a particular grazing regime may take many decades to dissipate; and 3) that the impacts of cattle ...
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ژورنال
عنوان ژورنال: Science
سال: 1907
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.25.628.71