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应用生态学报 ›› 2009, Vol. 20 ›› Issue (10): 2332-2338.

• 研究报告 • 上一篇    下一篇

氮肥对水曲柳和落叶松细根寿命的影响

于水强1**;王政权2;史建伟3;于立忠4;全先奎2   

  1. 1南京林业大学生态与环境科学系, 南京 210037;2东北林业大学林学院, 哈尔滨 150040;3山西大学黄土高原研究所, 太原 030006;4中国科学院沈阳应用生态研究所,沈阳 110016
  • 出版日期:2009-10-19 发布日期:2009-10-19

Effects of nitrogen fertilization on fine root lifespan of Fraxinus mandshurica and Larix gmelinii

YU Shui-qiang1|WANG Zheng-quan2|SHI Jian-wei3|YU Li-zhong4; QUAN Xian-kui2   

  1. 1Department of Ecology and Environmental Science, Nanjing Forestry University, Nanjing 210037, China;2School of Forestry, Northeast Forestry University, Harbin 150040, China;3Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China|4Institute of Applied Ecology, Chinese
     Academy of Sciences, Shenyang 110016, China
  • Online:2009-10-19 Published:2009-10-19

摘要: 采用微根管技术研究了氮肥对水曲柳和落叶松细根生长、衰老和死亡的影响,探讨两树种细根寿命与氮有效性之间的相关关系.结果表明:林地施氮肥后,两树种细根数量都呈减少趋势,细根总体直径增加,分枝程度降低;氮肥使水曲柳细根存活率提高,细根中位值寿命延长105 d,而落叶松细根存活率对氮肥反应不敏感;施氮肥对细根寿命的延长效应主要体现在直径较小的一级根、表层(0~15 cm)根系和春夏季新生的细根,表明氮肥对高生理活性的细根
影响较强.

关键词: 氮肥, 细根寿命, 微根管, 水曲柳, 落叶松

Abstract: Root observation tubes (minirhizotrons) were used to study the effects of nitrogen addition on the fine root growth of Fraxinus mandshurica and  Larix gmelinii, with the correlations between the fine root lifespan and nitrogen availability analyzed. After the nitrogen addition, the fine root number of
F. mandshurica and L. gmelinii had a decreasing trend, but the fine root diameter became larger and the branching ratio decreased. The survival rate of F. mandshurica fine roots increased, and the median root lifespan prolonged 105 days, compared with the control. No significant responses to the nitrogen addition were observed in the survival rate of L. gmelinii fine roots. The first-order fine roots with smaller diameter, the roots in surface soil (0-15 cm), and the fine roots newly born in spring and summer were vulnerable to extend their lifespan by nitrogen addition, suggesting that the fine r
oots with higher physiological activity were easily to be affected by nitrogen fertilization.

Key words: nitrogen fertilization, fine root lifespan, minirhizotron, Fraxinus mandshurica, Larix gmelinii