<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>New Zealand's potential forest composition was predicted from regressions relating the distributions of major canopy tree species to environment. Environmental variables, chosen for their correspondence to major tree physiological processes, included annual and seasonal temperature and solar radiation, soil and atmospheric water deficit, soil leaching, slope, and soil parent material and drainage. Environmental values were estimaged both for a large set of irregularly distributed plots describing forest composition, and points on a 1-km grid across New Zealand. Regressions were fitted to the ploy data species by species, with those for the four Nothofagus species also including terms to correct for the effects of their geographic disjunctions. Predictions of species abundance were then made for the grid data set, and the resulting matrix was classified to derive groups of similar composition. This data is expected to provide a context for both the assessment of the biodiversity value of surviving forest remnants and for the subsequent management and/or restoration of these sites.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
A reconstruction method of predicting New Zealand's indigenous forest ecosystem pattern. Statistical tools were used for both the interpolation of point climate data and the analysis of spatial patterns to predict high resolution environmental data to reconstruct New Zealand's potential vegetation pattern, i.e. that which could be expected in the absence of human activitiy. Environmental layers used were based on those to define the Land Environments of New Zealand (LENZ), allowing predictions of tree species abundance and forest composition to be made at a grid resolution of 100 metres. Key steps used in the reconstruction included defining the limits of forest cover and predicting its composition, setting the upper elevation limit for sub-alpine vegetation above treeline, and identifying sites likely to have supported shrublands, wetlands and dunelands below treeline.
ESRI ArcGIS shapefile. Data converted from original grid format in ArcGIS using generalised lines to a shapefile. This should be considered when viewing the data at a smaller scale. For analysis purposes it would be recommended that the grid data was used.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.3.3600