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首页> 外文期刊>Forest Ecology and Management >Forest floor mesofauna communities respond to a gradient of biomass removal and soil disturbance in a boreal jack pine (Pinus banksiana) stand of northeastern Ontario (Canada)
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Forest floor mesofauna communities respond to a gradient of biomass removal and soil disturbance in a boreal jack pine (Pinus banksiana) stand of northeastern Ontario (Canada)

机译：森林地板Mesofauna社区应对东北安大略省东北部（加拿大）的Boreal Jave Pine（Pinus Banksiana）的生物质去除和土壤干扰梯度

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摘要

Woody biomass is increasingly harvested in Canadian boreal forests as a source of bioenergy. However, there is concern over the environmental sustainability of harvesting practices. Our study assessed how forest floor mesofauna communities responded to an increasing intensity gradient of biomass removal and soil disturbance in a jack pine (Pinus banksiana) forest in northeastern Ontario, and whether any modification in community structure could be related to environmental change. Five experimental treatments were established that included a mature jack pine control stand (no recent harvesting) and harvesting of stem-only, whole-tree (stem, top and branches), whole-tree with stump removal and whole-tree with stump and forest floor (organic layer) removal. Two years after treatment application, we compared the structure of Collembola and Oribatida communities in moss, organic and mineral soil samples along this gradient. Despite both taxa showing somewhat contrasting responses, in general, each community had significantly lower density and species richness (a-diversity) and more compositional dissimilarities in response to biomass removal compared to uncut mature stands. These differences were especially marked in the two most intense removal treatments (whole-tree harvesting with stump removal and that with the additional forest floor removal). We attributed this result to the major loss of surface-dwelling species after harvesting and along the biomass removal gradient, especially in Oribatida communities, likely due to the loss of favourable microhabitats provided by moss and woody debris. Environmental changes observed along the gradient, beyond the loss of these microhabitats, were driven by the removal of forest floor decreasing soil nutrient richness and acidity and increasing soil temperature. Forest floor mesofaunal communities were clearly modified by more intensive biomass removal practices as compared to stem-only and whole-tree biomass harvesting. Long-term studies will be needed to investigate to what extent these patterns vary through time in order to inform sustainable management of woody biomass removal in this ecosystem.
机译：在加拿大北部森林中越来越多地收获木质生物量作为生物能源的来源。但是，对收获实践的环境可持续性有担忧。我们的研究评估了森林地板Mesofauna社区如何应对在安大略省东北部的杰克松（Pinus Banksiana）森林中的生物质去除和土壤干扰的增加的强度梯度，以及社区结构的任何修改是否可能与环境变化有关。建立了五种实验治疗，其中包括成熟的千斤顶杉木控制台（无近期收获）和收获干部，整棵树（茎，顶部和分支），整棵树用树桩和整个树木和森林地板（有机层）去除。治疗后两年后，我们将沿着该梯度沿着苔藓，有机和矿物土壤样品中的密封栓和奥里维达社区的结构进行了比较。尽管两种分类群呈现出略微对比的反应，但一般而言，与未切割成熟的展台相比，每个社区的密度和物种丰富度（一定多样性）和更具成分的差异具有更大的密度和物种，并且具有更高的成分异化。这些差异在两个最强烈的去除处理中尤其标记（整棵树收获的树桩除去，并且额外的森林地板去除）。我们将这种结果归因于收获后的表面居住物种的主要损失，沿着生物量清除梯度，特别是在奥里巴达社区中，可能由于苔藓和木质碎片提供的有利微藻的丧失。沿着梯度观察到的环境变化，超出了这些微藻的损失，通过去除森林地板降低土壤养分丰富性和酸度并增加土壤温度。与唯一的生物质清除措施相比，森林地板间隙群落明确修改，与茎干和全棵树生物测量相比，更加强化的生物量拆除实践。需要长期的研究来调查这些模式在多大程度上通过时间变化，以便在该生态系统中提供无需管理木质生物质去除的可持续管理。

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