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Conservation of species-rich subtropical grasslands: traditional management vs. legal conservation requirements in primary and secondary grasslands

机译:富含物种的亚热带草地保护:中小草原中的传统管理与法律保护要求

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Land-use change is the main cause of biodiversity losses, and for grasslands includes changes in management. The last 10 years has seen afforestation of traditionally grazed grasslands increase considerably in the understudied Serra do Sudeste region of the Brazilian Pampa, turning the region into a mosaic of tree plantations, natural ecosystems (partly in conservation areas without grazing management) and other land uses. We evaluated grassland plant community structure and composition in conservation areas considering two distinct types of land-use history and compared them to grasslands under traditional management. The study was carried out at 58 sites. Per site, three plots were established to sample the plant composition of the herbaceous and shrub layers. We used ordination techniques and indicator species analysis to describe patterns of community composition. We recorded a total of 516 species, thus confirming the high biodiversity of the region. We detected differences in vegetation structure and composition between primary and secondary grasslands. Our study emphasizes the need to increase conservation efforts in the region and points out that current conservation approaches should be evaluated critically regarding their effects for biodiversity conservation and that adequate grazing management is key for grassland biodiversity conservation.
机译:土地使用变化是生物多样性损失的主要原因,草原包括管理变化。过去10年来看,传统上放牧的草原的造林在被清除的塞拉斯·巴西帕普拉的Sudeste地区大幅增加,将该地区转变为树木种植园的马赛克,自然生态系统(部分在没有放牧管理的保护区)和其他土地使用。我们评估了考虑到两种不同类型的土地利用历史的保护区的草地植物群落结构和构图,并将其与传统管理下的草原相比。该研究在58个地点进行。每个网站,建立三个地块,以对草本和灌木层的植物组成进行采样。我们使用排序技术和指示物种分析来描述社区组成的模式。我们共记录了516种,从而证实了该地区的高生物多样性。我们检测到植被结构和初级草原之间的构成差异。我们的研究强调了需要增加该地区的节约努力,并指出,应批判性地对生物多样性保护的影响批判性,充足的放牧管理是草原生物多样性保护的关键。

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