科研之友
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摘要
the state of cear芍, located in northeast brazil, has a predominantly semi-arid climate. to guide future inventories of the flora, a preliminary survey of collections in the state was made, where we analyzed sampling effort and species richness of asteraceae, euphorbiaceae, fabaceae, poaceae and rubiaceae. geographic distribution of the samples was correlated to the seven phytoecological units of cear芍 state: caatinga arbustiva, caatinga arb車rea, carrasco, cerradˋo, complexo litoraneo, mata seca and mata 迆mida. the data were obtained from the prisco bezerra herbarium (eac) collection and were combined using the software brahms. from 1933 to august 2008, this collection registered the following: 11,551 exsiccatae (exs.) representing 1,209 species (spp.). this total number of exsiccatae is distributed as follows among the phytoecological units: mata 迆mida 27% exs. and 33% spp., complexo litoraneo 24% exs. and 24% spp., caatinga arbustiva 16% exs. and 19% spp., carrasco 13% exs. and 17% spp., mata seca 10% exs. and 9% spp., caatinga arb車rea 8% exs. and 12% and cerradˋo 2% exs. and 3% spp. these data reveal greater collection effort and species richness in areas of mata 迆mida and complexo litoraneo, followed by areas of caatinga arbustiva and caatinga arb車rea. with only 5% of ceara%26apos;s territory, sampling in mata 迆mida surpasses that in caatingas, the latter with 70% of the state%26apos;s territory. therefore, a satisfactory number of collections in mata 迆mida was observed to the detriment of other units, making it necessary to draw up new projects aimed at a greater effort in these sub-sampling collection areas.
