Regeneration under the Canopies of Native Species in a Restoration Area

Abstract This study aimed at evaluating the potential of Inga vera (Ingá) and Enterolobium contortisiliquum (Timbaúva) as facilitating species and their species-specific interaction on the restoration of a degraded and protected area in Rio Grande do Sul, Brazil. We surveyed the natural regeneration occurred under the canopies of 50 I. vera and E. contortisiliquum individuals, considering tree and shrub species with heights ≥ 30 cm and collar diameter ≥ 0.3 cm and < 10 cm. We found 756 individuals under I. vera and 166 individuals under E. contortisiliquum. The study revealed that, despite corresponding to 19% of the total species found, the exotic species comprises 43.6% under I. vera and 11% under E. contortisiliquum. The I. vera presented a more significant number of species and individuals under its canopies when compared to E. contortisiliquum and the reference area.

摘要 本研究旨在评估印加豆（Inga vera，俗称Ingá）与弯荚合欢（Enterolobium contortisiliquum，俗称Timbaúva）作为植物促进种的潜力，及其物种特异性相互作用对巴西南里奥格兰德州一处退化保护区域生态修复的影响。我们对50株印加豆和50株弯荚合欢个体的冠层下自然更新情况开展了调查，调查对象为株高≥30厘米、根颈直径≥0.3厘米且<10厘米的乔木与灌木物种。结果显示，印加豆冠层下共记录到756株个体，弯荚合欢冠层下则记录到166株个体。本研究发现，尽管外来物种仅占所记录物种总数的19%，但其在印加豆冠层下的个体占比达43.6%，在弯荚合欢冠层下的占比则为11%。相较于弯荚合欢与对照区域，印加豆冠层下的物种丰富度与个体总数均显著更高。