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首页> 外文期刊>Scandinavian Journal of Forest Research >Manipulating aspen (Populus tremuloides) seedling size characteristics to improve initial establishment and growth on competitive sites
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Manipulating aspen (Populus tremuloides) seedling size characteristics to improve initial establishment and growth on competitive sites

机译：操纵Aspen（Populus Trowulodes）幼苗尺寸特征，以改善竞争网站上的初始建立和生长

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摘要

Trembling aspen is an important component of the boreal mixedwood forest region and is a key component of numerous ecological functions. As a result, aspen has become a target species for forest restoration after industrial disturbance; however, aspen seedling afforestation research is still in its infancy as seedling and site characteristics and their interactions which drive establishment success in the field are poorly understood. This study examined the growth response of three aspen size classes across six sites differing in competition and soil moisture availability. With competing vegetation present, tall seedlings with lower root-to-shoot ratios had less height growth aboveground and reduced root egress (relative to total root mass) belowground, indicating that light was not the most limiting factor aboveground and that higher root-to-shoot ratios may aid in competition for rooting space. Differences between size classes were less pronounced on sites with no competition or sites with extreme conditions (high competition or low soil moisture availability) during outplanting. Reducing competing vegetation before outplanting improved height growth, particularly in seedlings with high root-to-shoot ratios. For aspen, planting short to medium-sized seedlings with higher root-to-shoot ratios offers a reasonable balance between cost and production of a stress-tolerant seedling.
机译：颤抖的阿斯彭是北方森林森林地区的重要组成部分，是众多生态功能的关键组成部分。结果，阿斯彭已成为产业障碍后森林恢复的目标物种;然而，阿斯彭幼苗造林研究仍处于幼苗和场地特征及其相互作用，驱动现场在该领域的成功被理解。本研究检测了在竞争和土壤湿度可用性不同的六个网站上的三个Aspen大小课程的生长响应。随着竞争植被存在，具有较低的根到射射比率的高幼苗在地上的高度增长并减少了地下的根出口（相对于总根质量），表明光不是地上最限制的因素，并且较高的根到射击比可能有助于生根空间的竞争。尺寸等级之间的差异在遗体期间没有竞争或站点的竞争或网站（高竞争或低土壤湿度可用性）的场地不太明显。减少竞争植被，然后穿过植入高度的高度，特别是在具有高根射向比率的幼苗中。对于白杨，种植短到中等大小的幼苗，具有较高的根到射线比率在成本和生产之间的耐育幼苗之间提供了合理的平衡。

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