CHANGES IN DROUGHT RESISTANCE AND ROOT-GROWTH CAPACITY OF CONTAINER SEEDLINGS IN RESPONSE TO NURSERY DROUGHT, NITROGEN, AND POTASSIUM TREATMENTS
CHANGES IN DROUGHT RESISTANCE AND ROOT-GROWTH CAPACITY OF CONTAINER SEEDLINGS IN RESPONSE TO NURSERY DROUGHT, NITROGEN, AND POTASSIUM TREATMENTS
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DOI：
10.1139/x92-100
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发表时间：
1992-05-01
影响因子：
2.2
通讯作者：
VANDENDRIESSCHE, R
中科院分区：
文献类型：
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作者：
VANDENDRIESSCHE, R
花旗松（Pseudotsuga menziesii（Mirb.）Franco），黑松（Pinus contorta Dougl.），和白色云杉（Picea glauca（Moench）Voss）幼苗。每种由两个种子批代表，从1989年2月至1990年1月在温室和塑料庇护所的Styroblock容器中生长。幼苗暴露于两个氮（N）处理和三个钾（K）处理因子安排在三个干旱处理。冬贮后，在3月12-14日期间，将来自一整套处理的幼苗种植到湿、中、旱沙床中。增加苗圃干旱胁迫增加了花旗松和黑松造林后的存活率，高N处理水平增加了黑松和白色云杉的存活率。在干旱条件下，结合苗圃干旱和高氮处理的火炬松的存活率增加了33%，表明苗圃的文化制度的重要性，股票质量。增加苗圃干旱减少幼苗大小相对较小，但增加N增加幼苗大小种植后一个赛季。芽/根比和存活率之间的正相关关系，在火炬松和白色云杉表明，增加氮增加了新梢生长和抗旱性的N范围内的调查。只有花旗松表现出干旱和氮处理之间的相互作用，存活率和干重对钾的反应都很小。根生长能力，在种植时测量，表现出在所有物种由于高氮处理的近似翻倍，也增加了白色云杉干旱胁迫。存活率与根系生长能力相关性较差，但沙床上干重生长与根系生长能力相关性较好。苗干重和百分之N在芽苗生长后测定与根的生长能力。通过改变苗圃处理来操纵根系生长能力显然是可能的，而不改变种植后对干旱胁迫的抗性。
Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), lodgepole pine (Pinus contorta Dougl.), and white spruce (Picea glauca (Moench) Voss) seedlings. each represented by two seed lots, were grown in Styroblock containers in a greenhouse and plastic shelter house from February 1989 to January 1990. The seedlings were exposed to two nitrogen (N) treatments and three potassium (K) treatments arranged factorially within three drought treatments. After winter storage, seedlings from a complete set of treatments were planted into hygric, mesic, and xeric sand beds during 12-14 March. Increasing nursery drought stress increased survival of Douglas-fir and lodgepole pine after planting, and high N treatment level increased survival of lodgepole pine and white spruce. Under xeric conditions, combined nursery drought and high N treatments increased survival of lodgepole pine by 33%, indicating the importance of nursery cultural regime for stock quality. Increase in nursery drought decreased seedling size relatively little, but increase in N increased seedling size one season after planting. A positive relationship between shoot/root ratio and survival in lodgepole pine and white spruce indicated that increase in N increased both shoot growth and drought resistance over the N range investigated. Only Douglas-fir showed an interaction between drought and N treatment and a small response in both survival and dry weight to K. Root growth capacity, measured at the time of planting, showed an approximate doubling in all species due to high N treatment, and was also increased in white spruce by drought stress. Survival and root growth capacity were poorly correlated, but dry-weight growth in sand beds was well correlated with root growth capacity. Shoot dry weight and percent N in shoots measured after nursery growth were correlated with root growth capacity. Manipulation of root growth capacity by changing nursery treatment was apparently possible without altering resistance to drought stress after planting.