Soil seed banks serve as reservoirs of taxonomic and genetic diversity and can buffer the effect of perturbations on plant communities, and thus are critical for community resilience. We studied the relationship of seed bank abundance and richness with different hydrological attributes, evaluated beta diversity patterns among wetlands in the Middle Paraná River floodplain, and experimentally explored soil seed bank germination after a drought period. Seed abundance was positively related to drought intensity and, along with richness, negatively related to drought and flood frequency. Turnover and balanced variation in abundance greatly contributed to the total beta diversity probably associated with the environmental heterogeneity of the floodplain; nestedness had a lower contribution probably associated with different dispersal abilities of species. Germination behavior varied between rooted and free-floating plants. In conclusion, the soil seed banks studied are highly variable among habitats; drought and flood frequency, and drought intensity are related with the seed banks abundance and richness; and the germination responses after a drought phase differ among broad ecological groups of wetland plants.

土壤种子库可作为分类学和遗传多样性的储藏库，可以缓冲扰动对植物群落的影响，因此对于群落的复原力至关重要。我们研究了种子库丰富度与丰富度与不同水文属性之间的关系，评估了巴拉那河中游平原湿地之间的β多样性模式，并通过实验探索了干旱时期后土壤种子库的萌发。种子的丰度与干旱强度呈正相关，而与丰度则与干旱和洪水频率呈负相关。营业额和丰度的平衡变化极大地促进了总的β多样性，这可能与洪泛区的环境异质性有关；巢度的贡献较小，可能与物种的不同分散能力有关。有根植物和自由漂浮植物的发芽行为各不相同。总之，研究的土壤种子库在生境之间变化很大。旱涝频率，干旱强度与种子库的丰度和丰富度有关。湿地植物的广泛生态组之间干旱期后的发芽反应也不同。