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Small seed bank in grasslands and tree plantations in former grassland sites in the South Brazilian highlands
Biotropica ( IF 2.1 ) Pub Date : 2020-04-20 , DOI: 10.1111/btp.12785
Mariana de Souza Vieira 1 , Gerhard Ernst Overbeck 1
Affiliation  

The soil seed bank can be an important source for vegetation regeneration, and data on the similarity between aboveground vegetation and the seed bank can provide information about successional pathways after disturbances or land‐use change. We conducted this study in natural grasslands in the subtropical highland region in southern Brazil. We evaluated the effect of silviculture on richness, density, and composition of the seed bank at former grassland sites converted to pine plantations 25 years ago. We worked at six grassland sites and three pine plantation sites and used the seedling emergence method. Seed bank density and richness in grasslands were lower than those reported in similar environments in other regions. Species richness and density varied considerably within each vegetation type; therefore, richness and density were not statistically significant, while composition varied among vegetation types. In terms of species, the pine plantation seed bank was a small subset of the grassland seed bank. Seeds of typical grassland species were missing in the pine plantation, but also had only low abundances in the grassland, and similarity of seed bank and vegetation were low (less than 20%). The low seed density found in this study, including in grasslands areas, indicates that regeneration of species from the soil seed bank likely is of a limited role for the maintenance of plant populations after disturbances in this system. Our data further suggest that natural regeneration after tree planting in grasslands is reduced due to seed limitation.

中文翻译:

巴西南部高地前草原场的草原和树木种植园中的小型种子库

土壤种子库可能是植被再生的重要来源,地上植被和种子库之间相似性的数据可以提供有关扰动或土地利用变化后演替途径的信息。我们在巴西南部亚热带高地地区的天然草地中进行了这项研究。我们评估了造林对25年前改建为松树人工林的原草场种子库的丰富度,密度和种子库组成的影响。我们在六个草地场和三个松树种植场工作,并使用了幼苗出苗方法。草原上的种子库密度和丰富度低于其他地区在类似环境中的报道。在每种植被类型中,物种的丰富度和密度变化很大;因此,植被的丰富度和密度均无统计学意义,而植被类型之间的组成有所不同。就物种而言,松树人工林种子库是草原种子库的一小部分。松树人工林缺少典型草地物种的种子,但草地中的丰度却很低,种子库和植被的相似度很低(不到20%)。在这项研究中发现的低种子密度,包括在草地地区,表明在该系统受到干扰后,土壤种子库中物种的再生对于维持植物种群的作用可能有限。我们的数据进一步表明,由于种子限制,在草原上植树后自然再生减少。松树人工林种子库是草原种子库的一小部分。松树人工林缺少典型草地物种的种子,但草地中的丰度却很低,种子库和植被的相似度很低(不到20%)。在这项研究中发现的低种子密度,包括在草地地区,表明在该系统受到干扰后,土壤种子库中物种的再生对于维持植物种群的作用可能有限。我们的数据进一步表明,由于种子限制,在草原上植树后自然再生减少。松树人工林种子库是草原种子库的一小部分。松树人工林缺少典型草地物种的种子,但草地中的丰度却很低,种子库和植被的相似度很低(不到20%)。在这项研究中发现的低种子密度,包括在草地地区,表明在该系统受到干扰后,土壤种子库中物种的再生对于维持植物种群的作用可能有限。我们的数据进一步表明,由于种子限制,在草原上植树后自然再生减少。种子库和植被的相似度很低(不到20%)。在这项研究中发现的低种子密度,包括在草地地区,表明在该系统受到干扰后,土壤种子库中物种的再生对于维持植物种群的作用可能有限。我们的数据进一步表明,由于种子限制,在草原上植树后自然再生减少。种子库和植被的相似度很低(不到20%)。在这项研究中发现的低种子密度,包括在草地地区,表明在该系统受到干扰后,土壤种子库中物种的再生对于维持植物种群的作用可能有限。我们的数据进一步表明,由于种子限制,在草原上植树后自然再生减少。
更新日期:2020-04-20
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