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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (22): 41-45.

• 林学 园艺 园林 • 上一篇    下一篇

长白落叶松播种苗数量分级研究

王艳青 李国雷   

  • 收稿日期:2011-03-08 修回日期:2011-04-21 出版日期:2011-09-05 发布日期:2011-09-05
  • 基金资助:

    中央高校基本科研业务费专项资金资助

Studies on the Quantitative Grade Standard for Sowed Seedlings of Larix olgensis

  • Received:2011-03-08 Revised:2011-04-21 Online:2011-09-05 Published:2011-09-05

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摘要：

长白落叶松播种苗需移栽培育后才能造林，而播种苗规格差异很大，对播种苗进行数量分级可实现分类栽培、节省水肥。笔者采用主成分法对长白落叶松播种苗进行分级，筛选出播种苗分级指标为地径、大于1 cm长侧根数、大于5 cm长I级侧根数，根据这些分类指标将播种苗划分为4级，I、II、III、IV级苗所占苗木总量的比例分别为2.2%、14.8%、29.6%和53.4%，移栽后成活率分别为80.0%、70.1%、60.8%和55.0%，各级别成活率存在显著差异。结果表明，移栽前需要对播种苗进行分级，从数量指标上划分为4级是科学合理，并切实可行。

关键词: 氮肥效率, 氮肥效率

Abstract:

Sowed seedlings of Larix olgensis were not planted in the field until they were transplanted for another year in the nursery. Because their size differentiated severely, sowed seedlings should have graded prior to transplanting in order to cost saving for irrigation and fertilization during subsequent culturing. Using principal component analysis, the grading standards were determined as diameter, the number of first-order lateral root>5 cm in length at junction, and the number of lateral root>1 cm in length. The ratio of I, II, III, and IV was 2.2%, 14.8%, 29.6%, and 53.4%, respectively. When they were transplanted, survival for these seedlings based on the grading standards was 80.0%, 70.1%, 60.8% and 55.0%. And significant differences in survival among the seedlings were found. Thus, the sowed seedlings should be graded prior to transplanting and could be graded into 4 classes based on these grading standards. Furthermore, the standards proved to be feasible and operational according to transplanting test.