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OALib Journal期刊
ISSN: 2333-9721
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持续供氮对长白落叶松播种苗生长及抗寒性的影响
DOI: 10.3969/j.issn.1000-2006.2013.01.007, PP. 44-48
Keywords: 长白落叶松,抗寒性,持续供氮,养分加载,苗木质量
Abstract:
养分加载是调控苗木质量的重要措施。在7月份常规施肥的基础上,8、9、10月份对长白落叶松播种苗分别进行持续追肥,研究不同的氮加载量对苗木形态指标、养分浓度、抗寒性的影响。结果表明:持续施氮后,长白落叶松播种苗苗高、地径分别比未施肥的苗木高出35.4%～52.4%和11.3%～19.0%;与常规施肥相比,持续供氮对苗高、地径均无显著影响。随氮加载量的增加,茎氮浓度无显著变化,而根氮浓度持续增大,根对氮加载比茎敏感;氮加载后苗木生物量增加显著,但处理间无明显差异。在1.5～-50℃整个降温过程中,施用氮肥苗木的相对电导率均显著小于未施氮肥的苗木;在1.5～-20℃间,施氮的苗木相对电导率未出现显著差异,相对电导率值为13.57%～23.12%;但温度由-30℃降至-50℃时,相对电导率值均急剧上升至23.28%～35.59%;360、420kg/hm2施氮处理的苗木相对电导率显著低于常规施肥的苗木,表明对长白落叶松播种苗进行氮加载可能有利于提高苗木抗寒性。
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