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首页> 外文期刊>New Forests >Morphological characteristics associated with tolerance to competition from herbaceous vegetation for seedlings of jack pine, black spruce, and white pine
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Morphological characteristics associated with tolerance to competition from herbaceous vegetation for seedlings of jack pine, black spruce, and white pine

机译：形态特征与杰克松，黑云杉和白松幼苗对草本植物竞争的耐受性相关

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摘要

Tolerance of bareroot and container-grown seedlings of black spruce (Picea mariana (Mill.) B.S.P.), jack pine (Pinus banksiana Lamb.), and eastern white pine (Pinus strobus L.) to competition from herbaceous vegetation was examined in the first five years after planting on a site in the Great Lakes/St. Lawrence forest of Ontario, Canada. Shoot and root morphological characteristics of various stocktypes were measured before planting and correlated with 5-year survival and growth following control and no control of herbaceous vegetation. For black spruce and jack pine, medium-sized bareroot stocktypes had greater relative 5-year stem volume growth in the presence of herbaceous vegetation than did container stock of either species or large bareroot stock of spruce. Relative volume growth was measured as the ratio of the cumulative stem volume increment in the presence of vegetation (Veg) to that in the absence of vegetation (NoVeg), i.e., the Veg:NoVeg ratio. In white pine, the Veg:NoVeg ratio of volume increment of medium container and large bareroot stocktypes exceeded that of small container and medium bareroot stocktypes. In jack pine, root collar diameter at planting and number of first-order lateral roots were positively correlated with 5-year Veg:NoVeg ratio of volume increment. In white pine, the Veg:NoVeg ratio was also positively correlated with root collar diameter at planting and with root volume. In black spruce, the ratio was not related to pre-plant morphology. Thus, for white pine and jack pine, certain pre-plant morphological features may be useful in forecasting the relative ability of different stocktypes to grow under herbaceous competition conditions in the field.
机译：首先研究了黑云杉（Picea mariana（Mill。）BSP），千斤顶松（Pinus bankiana Lamb。）和东部白松（Pinus strobus L.）的裸根和容器生长幼苗对草本植物竞争的耐受性。在大湖区（St.加拿大安大略省的劳伦斯森林。种植前测量了各种种群类型的枝条和根系形态特征，并与草木植被控制和未控制后的5年生存和生长相关。对于黑云杉和杰克松，中型裸根种群类型在存在草木植被的情况下具有相对较高的5年茎体积增长，而不是同一种物种或大型裸根云杉种群的容器种群。相对体积的增长以存在植物（Veg）时的累积茎体积增量与不存在植物（NoVeg）时的累积茎体积增量之比，即Veg：NoVeg比率来测量。在白松树中，中型容器和大型裸根种群类型的体积增量的Veg：NoVeg比超过了小型容器和中型裸根种群类型的体积增量。在千斤顶松中，种植时的根颈直径和一阶侧根的数量与5年Veg：NoVeg体积增加比成正相关。在白松树中，Veg：NoVeg比值也与种植时的根颈直径和根体积呈正相关。在黑云杉中，该比例与种植前的形态无关。因此，对于白松和杰克松，某些植物前的形态特征可能有助于预测田间在草本竞争条件下不同种群的相对生长能力。

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