科研之友
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摘要
Academic institutions can contribute to an adequate urban forestry through the use of appropriate species, although in some of the university campi it is found predominance of exotic species. The aim of this paper was performing a comparative analysis of the tree and shrub species used in university campi in Brazil which surveys are available in the literature. Each species was investigated on this origin (Brazilian native or exotic). With this information and the data of species occurrence, it was conducted exploratory and confirmatory analyses. Although the predominant use of native species (344 - 57.43% of the total found in the compilation), the number of exotic ones (255 - 42.57% of the total) was high if we take in account the unique diversity of the Brazilian flora. The use of native and exotic species differed between the surveys (chi 2 = 132.2, p %26lt; 0.0001); seven campi used significantly (p %26lt; 0.05) more native than exotic species and three of them, more exotic. The most frequent species was %26quot;pau-brasil%26quot; (Caesalpinia echinata Lam.), classified as %26quot;In dangerous%26quot; by the Red List of Threatened Species. The floristic similarity between the surveys was low in general, but it was higher between surveys closer in space (Mantel, r = -0,4459, p = 0,0020), suggesting that campi under different local and regional contexts tend to use different species. The majority of indicator species (those with the highest Indicator Values) was native, but the best ones were exotic. It is recommended a more intensive employment of native species (especially the autochthone ones) in urban space, manly where knowledge is generated and diffused, i.e. in the universities.
- 出版日期2013-6
