Different types of matrices can perform different disturbance regimes over remnant forests, which can ultimately affect plant diversity. To address these issues, we studied 60 plots in forest remnants embedded within sugarcane plantations and pasturelands in the Atlantic Forest of Southeastern Brazil. Our objectives were to evaluate general patterns of plant diversity and to assess the influence of landscape structure and dynamics on plant richness and diversity. We recorded 297 species in two strata. (DBH superior stratum ≥ 4.8 cm > inferior stratum). Overall, diversity of the inferior stratum was higher in pastureland forest remnants than in sugarcane matrices. In the superior stratum, time since abandonment represented a greater influence. Considering the partition of diversity, more than 40% of total diversity was due to the alpha component alone in all cases, but it was significantly lower than expected. Beta components among forest remnants, landscapes and matrices were higher than expected for both strata, whether together or separately. Habitat heterogeneity showed a higher contribution to the total floristic diversity, but among remnants this contribution was even more significant. Forest remnants in pasturelands had a more dynamic land use history and parameters of landscape dynamics were more related to plant diversity. For remnants in the sugarcane matrices, species richness and composition were explained by landscape structure. Our results highlight that there is an important plant community diffused in the forest remnants of human-modified landscapes. Therefore, conserving the majority of remnants and restoring degraded ones must be a key conservation strategy.

不同类型的矩阵可以对残留森林执行不同的干扰机制，这最终会影响植物多样性。为了解决这些问题，我们研究了巴西东南部大西洋森林甘蔗种植园和牧场中埋藏的60个森林遗留地。我们的目标是评估植物多样性的一般模式，并评估景观结构和动力学对植物丰富度和多样性的影响。我们在两个层次中记录了297种。（DBH上层≥4.8 cm>下层）。总体而言，牧场森林残留物中下层的多样性高于甘蔗基质。在上层，遗弃后的时间影响更大。考虑到多样性的划分，在所有情况下，总多样性中有40％以上是仅由alpha成分造成的，但它明显低于预期。无论是在一起还是单独，森林残余，景观和基质中的Beta成分都高于预期。栖息地的异质性对总的植物多样性表现出更高的贡献，但在残留物中，这一贡献更为显着。牧场中的森林残留物具有更动态的土地利用历史，景观动态参数与植物多样性更相关。对于甘蔗基质中的残留物，物种丰富度和组成可以通过景观结构来解释。我们的结果表明，在人类改造景观的森林残留物中散布着重要的植物群落。所以，