Influence of Pinus taeda plantation on the seed bank in an Araucaria Rainforest region

Abstract This study aimed to evaluate the effect of a Pinus taeda plantation on the floristic and species composition of the seed bank in remnant of the Araucaria Rainforest (FOM). For this purpose, a total of 160 samples were collected from the seed bank, 80 of a FOM remnant and 80 from a P. taeda plantation. The samples were placed to germinate in two different greenhouses, under 35% and 75% shading level. A total of 11,669 woody and herbaceous individuals were counted, distributed in 31 botanical families and 84 species. The families Asteraceae and Poaceae were the most representative in richness of herbaceous species. With regard to woody species, Solanaceae and Asteraceae were the most representative in both areas. The species P. taeda was recorded only in the seed bank of the plantation. The seed bank of the pinus plantation was characterized mainly by the low richness of woody species, which shows its influence on the seed stock. On the other hand, the FOM remnant seems not to be influenced by the proximity of the pinus plantation to it is seed bank.

摘要 本研究旨在评估火炬松（Pinus taeda）人工林对南洋杉雨林残遗斑块（FOM）种子库（seed bank）的区系与物种组成的影响。为此，研究人员共采集160份种子库样本，其中80份取自FOM残遗斑块，80份取自火炬松人工林。将样本分别置于两个不同温室中，在35%与75%的遮光度梯度下进行萌发试验。本研究共统计得到11669株木本与草本个体，分属31个植物科、84个物种。其中，菊科（Asteraceae）与禾本科（Poaceae）在草本物种丰富度上占主导地位；就木本物种而言，茄科（Solanaceae）与菊科（Asteraceae）在两个样地中均为优势类群。火炬松仅在人工林的种子库中被记录到。火炬松人工林的种子库以木本物种丰富度偏低为主要特征，体现了其对种子库的影响。另一方面，FOM残遗斑块的种子库似乎未受邻近火炬松人工林的影响。