Abstract Sustainable forest management relies on the understanding of biodiversity response to disturbance and the ecological resilience of the system. The dynamic equilibrium hypothesis (DEM) predicts that site productivity will modulate the effects of disturbance gradient on biodiversity. Also, considering functional diversity (eco-morfo-phisicological traits related to resource usage) is needed to understand the effect of species gains and losses on ecosystem functionality. Here we assess the response of understory plant taxonomic and functional diversity to increasing harvesting intensities (0, 30, 50 and 70% of basal area removed) at three woodland sites of contrasting biomass growth (productivity) in northern Patagonia. Also, we assessed resilience based on comparisons with undisturbed treatments four years after initial harvest. In agreement with DEM, both taxonomic and functional diversity peaked at high, medium, or low harvesting intensities in the high-, medium-, or low-productivity site, respectively. Taxonomic composition was clearly determined by site productivity (biomass growth), while no pattern emerged for functional composition. Functional traits related to light use showed different responses: specific leaf area was only affected by site productivity while leaf chlorophyll content was affected by an interaction between harvesting intensity and site productivity. Interestingly, there was no effect of harvesting intensity on the resilience of taxonomic diversity and functional composition. Only for functional diversity, harvesting intensity was as important as site productivity. In the high and intermediate productivity sites the traits that characterizes the system were more resilient and resembled the control treatment after four years of low or high (but not intermediate) harvesting intensities. Our results support the use of the DEM on forest interventions and the importance of considering both taxonomic and functional composition, as the consideration of functional traits related to resource use strategies have different implications when considering the resilience of the system.

中文翻译：

---

巴塔哥尼亚北部林地不断增加的采伐强度下的多样性、功能性和恢复力

摘要 可持续森林管理依赖于对生物多样性对干扰的反应和系统生态恢复力的理解。动态平衡假设 (DEM) 预测场地生产力将调节干扰梯度对生物多样性的影响。此外，需要考虑功能多样性（与资源使用相关的生态形态特征）以了解物种获得和损失对生态系统功能的影响。在这里，我们评估了林下植物分类和功能多样性对巴塔哥尼亚北部三个生物量增长（生产力）对比鲜明的林地地点增加的采伐强度（去除基础面积的 0、30、50 和 70%）的响应。此外，我们根据初始收获四年后与未受干扰处理的比较来评估恢复力。与 DEM 一致，分类和功能多样性分别在高、中或低生产力地点的高、中或低收获强度下达到峰值。分类组成明确地由场地生产力（生物量增长）决定，而功能组成没有出现模式。与光照相关的功能性状表现出不同的反应：比叶面积仅受立地生产力的影响，而叶叶绿素含量则受收获强度和立地生产力之间相互作用的影响。有趣的是，收获强度对分类多样性和功能组成的恢复力没有影响。仅就功能多样性而言，采伐强度与场地生产力同样重要。在高和中等生产力地点，表征系统的性状更具弹性，并且在四年的低或高（但不是中等）收获强度后类似于对照处理。我们的结果支持在森林干预中使用 DEM 以及考虑分类和功能组成的重要性，因为在考虑系统的弹性时，考虑与资源使用策略相关的功能特征具有不同的含义。