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Resprouting drives successional pathways and the resilience of Caatinga dry forest in human-modified landscapes
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-12-31 , DOI: 10.1016/j.foreco.2020.118881
Maria Fabíola Barros , Elâine M.S. Ribeiro , Renato Soares Vanderlei , Alexandre Souza de Paula , Ana Beatriz Silva , Rainer Wirth , Marcus V. Cianciaruso , Marcelo Tabarelli

Tropical forest regeneration has gained renewed interest in recent years as secondary forests have being considered biodiversity repositories and a key source for globally relevant ecosystem services as climate regulation and carbon sequestration and storage. Here, we address the regeneration of a Caatinga dry forest in the context of slash-and-burn agriculture and chronic anthropogenic disturbance by examining forest regeneration mechanisms and a comprehensive set of community-level plant diversity measures (i.e., taxonomic, functional, and phylogenetic) in regenerating (4 to 70-yr old) and old-growth forest stands. Resprouting from root suckers was the predominant regeneration mechanism across recently abandoned crop fields. Overall, regenerating forests were similar to old-growth forests in terms of taxonomic and functional composition, and functional and phylogenetic diversity. Moreover, except for the taxonomic diversity, community-level plant diversity measures were not related to forest age or soil properties. Our results suggest that Caatinga dry forest covering sandy soils is particularly resilient due to regeneration driven by resprouting. The same set of plant species dominates the entire regeneration process, including old-growth forest stands. Accordingly, Caatinga dry forest regeneration may follow an initial composition model, rather than following a directional and deterministic trajectory associated with species replacements. This initial composition model probably results from a combination of three factors: (1) early regeneration driven by resprouting rather than seed arrival and seedling recruitment; (2) biomass accumulation mostly due to growth by early colonizers and by those species able to resprout after chronic anthropogenic disturbance and during forest regeneration; and (3) the co-occurrence of functionally distinct plant species. Accordingly, resprouting can guarantee some level of resilience, and hence, the services provided by secondary forests. Nevertheless, forest dynamics in landscapes inhabited by forest-dependent people are affected to a great extent by the nature of the imposed pressures and the ecological profile of the remaining flora.



中文翻译:

在人类改造景观中,发芽驱动演替路径和Caatinga干旱森林的复原力

近年来,由于次生林已被视为生物多样性资源库,并且是气候调节,碳固存和储存等全球相关生态系统服务的主要来源,热带森林更新引起了人们的新兴趣。在这里,我们通过研究砍伐森林的再生机制和一套全面的社区级植物多样性措施(例如,分类学,功能学和系统发生学),探讨在刀耕火种的农业和慢性人为干扰的背景下,卡廷加干旱森林的再生)(再生到4至70岁)和老林林分。根吸盘的再生是最近废弃农作物田间的主要再生机制。总体而言,就分类和功能组成而言,再生林与老龄林相似,以及功能和系统发育多样性。此外,除了生物多样性外,社区一级的植物多样性措施与森林年龄或土壤特性无关。我们的研究结果表明,由于重生驱动再生,Caatinga干旱森林覆盖的沙质土壤尤其具有弹性。同一套植物物种在整个再生过程中均占主导地位,包括老林林分。因此,Caatinga干旱森林的更新可能遵循初始组成模型,而不是遵循与物种替代相关的方向性和确定性轨迹。这个初始组成模型可能是由以下三个因素共同导致的:(1)由重新发芽驱动的早期再生,而不是种子到达和幼苗募集;(2)生物量积累主要是由于早期定居者的生长以及那些在慢性人为干扰和森林更新过程中能够萌芽的物种的生长;(3)功能上不同的植物物种同时存在。因此,重新发芽可以保证一定程度的弹性,因此可以保证次生林提供的服务。然而,依赖森林的人所居住的景观中的森林动态在很大程度上受到施加压力的性质和其余植物区系的生态影响。次生林提供的服务。然而,依赖森林的人所居住的景观中的森林动态在很大程度上受到施加压力的性质和其余植物区系的生态影响。次生林提供的服务。然而,依赖森林的人所居住的景观中的森林动态在很大程度上受到施加压力的性质和其余植物区系的生态影响。

更新日期:2020-12-31
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