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Persistent Effects of Landscape Context on Recruitment Dynamics During Secondary Succession of Tropical Forests
Global Change Biology ( IF 10.8 ) Pub Date : 2025-01-24 , DOI: 10.1111/gcb.70037
Michiel van Breugel, Jefferson S. Hall, Mario Bailon, Dylan Craven

Large‐scale reforestation is promoted as an important strategy to mitigate climate change and biodiversity loss. A persistent challenge for efforts to restore ecosystems at scale is how to accelerate ecological processes, particularly natural regeneration. Yet, despite being recognized as an important barrier to the recovery of diverse plant communities in tropical agricultural landscapes, the impacts of dispersal limitation on natural regeneration in secondary forests—and especially how this changes as these forests grow older—are still poorly studied. In a region where animals have been shown to be the dominant seed dispersers, we evaluate the impacts of proximity to a connected network of narrow streamside strips of forest (SSF) on recruitment in 1–40‐year‐old secondary forests. We used 8 years of annual census data from 45 sites with paired plots, one directly adjoining an SSF and the other further uphill (henceforth “landscape context”), and a null model approach to test the effects of proximity to SSFs and basal area, while accounting for variation in soil, topography, and distance between plots and stand structure. In general, we found that landscape context affects multiple aspects of recruitment, including species diversity and the proportion of rarer and less‐widely distributed species among the recruits. Unexpectedly, this effect did not weaken over time, despite a fast increase in stand basal area and diversity. This suggests that forest development over the first decades of succession may not be sufficient to attract the animals that disperse rarer tree species. Our results provide empirical evidence to guide restoration initiatives in agricultural landscapes in tropical regions, principally prioritizing the restoration of forest corridor networks along streams, while also highlighting the knowledge gap about restoring animal dispersers in secondary forests.

中文翻译:


景观环境对热带森林次生演替期间补充动态的持续影响



大规模重新造林被推广为缓解气候变化和生物多样性丧失的重要策略。大规模恢复生态系统的一个持续挑战是如何加速生态过程,特别是自然再生。然而,尽管被认为是热带农业景观中多种植物群落恢复的重要障碍,但分散限制对次生林自然更新的影响——尤其是随着这些森林的老龄化而变化——仍然研究不足。在动物已被证明是主要种子传播者的地区,我们评估了靠近狭窄河边林带 (SSF) 的互联网络对 1-40 年次生林招募的影响。我们使用了来自 45 个配对地块的 8 年年度普查数据,一个直接毗邻 SSF,另一个更上坡(以下简称“景观环境”),并使用零模型方法来测试靠近 SSF 和基底区域的影响,同时考虑土壤、地形的变化以及地块和林分结构之间的距离。一般来说,我们发现景观环境会影响招募的多个方面,包括物种多样性以及招募中稀有和分布较不广泛的物种的比例。出乎意料的是,尽管林分基部面积和多样性迅速增加,但这种影响并没有随着时间的推移而减弱。这表明,在演替的最初几十年里,森林发展可能不足以吸引分散稀有树种的动物。 我们的结果为指导热带地区农业景观的恢复计划提供了实证证据,主要优先考虑沿溪流森林走廊网络的恢复,同时也强调了在次生林中恢复动物分散者的知识差距。
更新日期:2025-01-24
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