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首页> 外文期刊>Forest Ecology and Management >Cumulative effects of chronic deer browsing and clear-cutting on regeneration processes in second-growth white spruce stands.
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Cumulative effects of chronic deer browsing and clear-cutting on regeneration processes in second-growth white spruce stands.

机译：多年生鹿浏览和砍伐对次生白云杉林分再生过程的累积影响。

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Interactions between multiple disturbances can alter resilience mechanisms, thereby triggering alternative successional pathways. Regeneration processes are important mechanisms of forest resilience because they drive successional pathways. On Anticosti Island, chronic browsing by introduced white-tailed deer ( Odocoileus virginianus) shifted composition of understory regeneration of overmature balsam fir ( Abies balsamea) forests toward dominance by white spruce ( Picea glauca). Historic clear-cutting of these altered forests generated mature second-growth white spruce stands. However, the cumulative effect of chronic deer browsing and recent clear-cutting on regeneration processes of mature second-growth white spruce stands has not yet been evaluated. Our objective is to evaluate if regeneration processes would enable white spruce stands to recover from the cumulative effects of these two disturbances. We studied regeneration in relation to seed availability, substrate suitability for seedling establishment, and substrate availability in mature second-growth white spruce stands and recent clear-cuts of mature second-growth white spruce stands. Our results indicate regeneration failure in both ecosystems, which can be explained by a lack of suitable rotten logs for sufficient establishment of white spruce seedlings. Hence, the cumulative effects of chronic deer browsing and clear-cutting of mature second-growth white spruce stands have altered regeneration processes and triggered an alternative successional pathway toward parklands, i.e., partial deforestation. We propose shelterwood cuttings that create nurse logs should be investigated to maintain white spruce stands without planting.
机译：多种干扰之间的相互作用可以改变复原力机制，从而触发替代的演替路径。再生过程是森林复原力的重要机制，因为它们驱动着演替途径。在安蒂科斯蒂岛上，引入的白尾鹿（Odocoileus virginianus）进行的长期浏览将过早的苦瓜冷杉（Abies balsamea）森林的林下再生构成转移到由白云杉（Picea glauca）主导的位置。这些经过改建的森林经过历史性的砍伐，形成了成熟的第二生长的白云杉林。然而，尚未评估过慢性鹿浏览和近距离切割对成熟的第二生长的白云杉林分更新过程的累积影响。我们的目标是评估再生过程是否会使白云杉林从这两种干扰的累积影响中恢复过来。我们研究了与种子可利用性，基质对幼苗建立的适应性以及成熟的次生白云杉林和最近成熟的次生白云杉林的基质利用率有关的再生。我们的结果表明两个生态系统中的再生失败，这可以通过缺乏适当的腐烂原木来充分建立白云杉幼苗来解释。因此，慢性鹿的浏览和成熟的第二生长的白云杉林分砍伐的累积效应改变了再生过程，并引发了通往公园的替代演替途径，即部分森林砍伐。我们建议应调查产生护士原木的shelter木shelter插，以保持白色云杉林分而无需种植。

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