Subirrigation of Quercus rubra Seedlings : Nursery Stock Quality, Media Chemistry, and Early Field Performance
Subirrigation of Quercus rubra Seedlings : Nursery Stock Quality, Media Chemistry, and Early Field Performance
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红栎幼苗的地下灌溉：苗木质量、介质化学和早期田间表现
DOI：
10.21273/hortsci.43.7.2179
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发表时间：
2008
期刊：
影响因子：
1.9
通讯作者：
D. Jacobs
中科院分区：
文献类型：
--
作者：
M. Bumgarner;K. Salifu;D. Jacobs
林木苗圃的容器育苗生产系统面临着合理用水的挑战。地下灌溉系统可以通过减少用水量来替代高架系统，但对于林木幼苗的繁殖仍然相对未经测试。研究了不同基质（40：60、60：40和80：20泥炭：泥炭）和施肥（0或1.2 g氮/株）对北方红栎（Quercus rubra L.）幼苗施肥增加了地上生物量和养分含量，但降低了根干重。相对于高架灌溉幼苗，地下灌溉增加红橡树幼苗地上生物量生产以及地上和地下氮含量施肥条件下。媒体没有影响植物的反应。地下灌溉增加电导率（5 dSm-1以上），并降低pH值在上层介质区（0至5厘米从顶部），而相反的效果被发现在较低的区域。苗圃施肥与田间存活率和生长减少，这可能是由于较高的芽：根造成的移植压力。地下灌溉幼苗有更大的领域直径增长。我们的研究结果表明，地下灌溉可以作为一个可行的替代高架系统在容器繁殖的硬木幼苗。
Container seedling production systems for forest tree nurseries are challenged by the need for judicious water consumption. Subirrigation systems may provide an alternative to overhead systems by mitigating water use, yet remain relatively untested for propagation of forest tree seedlings. We evaluated effects of overhead versus subirrigation under varying media (40:60, 60:40, and 80:20 peat:perlite) and fertiliza- tion (0 or 1.2 g nitrogen/plant) regimes on nursery development and first-year field performance of northern red oak (Quercus rubra L.) seedlings. Fertilization increased aboveground biomass production and nutrient content, but decreased root dry weight. Relative to overhead-irrigated seedlings, subirrigation increased red oak seedling aboveground biomass production as well as above- and belowground nitrogen content under fertilized conditions. Media had no effect on plant response. Subirrigation increased electrical conductivity (5 dSm -1 greater) and decreased pH in the upper media zone (0 to 5 cm from top), whereas the opposite effect was found in the lower zone. Nursery fertilization was associated with reduced field survival and growth, which may have been the result of transplant stress resulting from higher shoot:root. Subirrigated seedlings had greater field diameter growth. Our results suggest that subirrigation could serve as a viable alternative to overhead systems in container propagation of hardwood seedlings.