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中国农学通报

中国农学通报 ›› 2016, Vol. 32 ›› Issue (22): 5-9.doi: 10.11924/j.issn.1000-6850.casb15120083

• 林学 园艺 园林 • 上一篇    下一篇

钾对黑木相思苗木生长、根系形态的影响

陈利娜,裘珍飞,丁晓纲,张方秋,李吉跃,何茜,杨海燕   

  1. 华南农业大学林学与风景园林学院,中国林业科学研究院热带林业研究所,广东省林业科学研究院,广东省林业科学研究院,华南农业大学林学与风景园林学院,华南农业大学林学与风景园林学院,广东省林业科学研究院
  • 收稿日期:2015-12-14 修回日期:2016-02-22 接受日期:2016-02-25 出版日期:2016-08-09 发布日期:2016-08-09
  • 通讯作者: 丁晓纲
  • 基金资助:
    广东省教育部产学研结合项目“相思优良无性系规模化扩繁研究与示范”(2009B090300294)。

Effects of Potassium on Seedling Growth and Root Morphology of Acacia melanoxylon

  • Received:2015-12-14 Revised:2016-02-22 Accepted:2016-02-25 Online:2016-08-09 Published:2016-08-09

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摘要： 旨在探求黑木相思苗木对K肥的响应机制，进而为黑木相思苗木培育提供理论依据。采用随机区组设计施钾肥方法，进行了7 种浓度处理。试验结果显示150~200 mg/株为最佳施钾范围，K-200 与K-150 处理，苗木生长、根长处于较高的水平，并与对照和其他处理差异明显，其中K-150 处理效果尤佳。试验结束时，K-150 处理地径和苗高分别为2.07 mm、35.4 cm，地下部分（根）和地上部分（茎叶）生物量分别为0.19 g、1.14 g，分别较对照增加了27%，33%，90%和97%；根长为380.10 cm，较对照增加了60.3%。试验说明适量的K肥能促进黑木相思苗木生长，但施钾量过高(K-300)或者过低(K-50)都对根系生长促进作用不大，施钾量过高甚至于会阻碍根系生长，进而影响苗木生长。

关键词: 春夏季, 春夏季, 连阴雨, 蜜桃, 生产, 影响

Abstract: The study aims to explore the response mechanism of Acacia melanoxylon seedling to K fertilizers, and provide a theoretical basis for Acacia melanoxylon seedling cultivation. A randomized block design was used to set potassium fertilizer application. Treatments with seven different concentrations were carried out. The results showed that the best fertilization range was 150-200 mg/seedling, and the effect of both treatment K- 200 and K- 150 were significantly different from other treatments. At the end of the trial, the ground diameter and seedling height of treatment K- 150 were 2.07 mm and 35.4 cm, while the underground and above-ground biomass were 0.19 g and 1.14 g, which increased by 27%, 33%, 90% and 97% respectively compared with the control. The root length was 380.10 cm, which increased by 60.3% compared with the control. The trial indicated that suitable potassium fertilizer application could promote the growth of Acacia melanoxylon seedling. However, if the application amount was too high (K-300) or too low (K-50), it would even damage the plant’s root system and affect plant’s growth.

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