Full Length Research Paper
This study aimed to estimate the redistribution of rainfall in a Caatinga vegetation fragment of about 50 years in fallow system, in late stage of regeneration. To quantify the throughfall, rainfall collectors were installed in six individuals of the species Croton blanchetianus, Mimosa tenuiflora, Cnidoscolus quercifolius, Aspidosperma pyrifolium and Poincianella bracteosa, totaling 30 rainfall collectors. For the stemflow, collecting system set around the stems of the six subjects in each of the five selected species was used, consisting of collecting gutters in a spiral. In addition, a rain gauge was installed in an open location to quantify the open precipitation, which during the study period was equal to 1173.56 mm. The C. quercifolius species had the highest average of throughfall; probably this may be related to the peculiarities in relation to architecture and canopy shape. The stemflow has lower shares in gross precipitation in A. pyrifolium and C. quercifolius species, representing 15.25 to 12.48% of the total rainfall, respectively. The values obtained for the interception losses were greater than 60% in all species.
Key words: Forestal hydrology, throughfall, stemflow.
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