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Can forest management based on natural disturbances maintain ecological resilience?

机译:基于自然干扰的森林管理能否维持生态韧性?

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摘要

Given the increasingly global stresses on forests, many ecologists argue that managers must maintain ecological resilience: the capacity of ecosystems to absorb disturbances without undergoing fundamental change. In this review we ask: Can the emerging paradigm of natural-disturbance-based management (NDBM) maintain ecological resilience in managed forests? Applying resilience theory requires careful articulation of the ecosystem state under consideration, the disturbances and stresses that affect the persistence of possible alternative states, and the spatial and temporal scales of management relevance. Implementing NDBM while maintaining resilience means recognizing that (i) biodiversity is important for long-term ecosystem persistence, (ii) natural disturbances play a critical role as a generator of structural and compositional heterogeneity at multiple scales, and (iii) traditional management tends to produce forests more homogeneous than those disturbed naturally and increases the likelihood of unexpected catastrophic change by constraining variation of key environmental processes. NDBM may maintain resilience if silvicultural strategies retain the structures and processes that perpetuate desired states while reducing those that enhance resilience of undesirable states. Such strategies require an understanding of harvesting impacts on slow ecosystem processes, such as seed-bank or nutrient dynamics, which in the long term can lead to ecological surprises by altering the forest's capacity to reorganize after disturbance.
机译:鉴于全球对森林的压力越来越大,许多生态学家认为,管理者必须保持生态适应力:生态系统吸收干扰而不经历根本变化的能力。在这篇评论中,我们问:基于自然干扰的管理(NDBM)的新兴范式能否在人工林中维持生态适应力?应用复原力理论要求仔细考虑所考虑的生态系统状态,影响可能的替代状态持续存在的干扰和压力以及管理相关性的时空尺度。在保持复原力的同时实施NDBM意味着要认识到(i)生物多样性对于长期的生态系统持久性很重要;(ii)自然干扰在多种尺度上都起着结构和组成异质性的产生作用,并且(iii)传统管理趋向于生产的森林比自然受到干扰的森林更均匀,并且通过限制关键环境过程的变化,增加了意外灾难性变化的可能性。如果造林策略保留了使所需状态永久存在的结构和过程,同时减少了那些增强不良状态的恢复能力的结构和过程,则NDBM可能会保持弹性。这些策略需要了解采伐对缓慢的生态系统过程的影响,例如种子库或养分动态,从长远来看,这可能会通过改变森林在干扰后的重组能力而导致生态意外。

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