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林业科学 ›› 2010, Vol. 46 ›› Issue (5): 14-19.doi: 10.11707/j.1001-7488.20100503

• 论文 • 上一篇    下一篇

氮添加对兴安落叶松养分分配和再吸收效率的影响

赵琼,刘兴宇,胡亚林,曾德慧   

  1. 中国科学院沈阳应用生态研究所 沈阳110016
  • 收稿日期:2009-03-12 修回日期:1900-01-01 出版日期:2010-05-25 发布日期:2010-05-25
  • 通讯作者: 曾德慧

Effects of Nitrogen Addition on Nutrient Allocation and Nutrient Resorption Efficiency in Larix gmelinii

Zhao Qiong;Liu Xingyu;Hu Yalin;Zeng Dehui   

  1. Institute of Applied Ecology, Chinese Academy of SciencesShenyang 110016
  • Received:2009-03-12 Revised:1900-01-01 Online:2010-05-25 Published:2010-05-25

摘要:

以东北林业大学帽儿山实验林场18年生兴安落叶松人工林为对象,研究连续5年N添加(NH4NO3,10 g·m-2a-1)对落叶松各器官N,P,K,Ca和Mg含量及叶片养分再吸收效率的影响。结果表明:N添加对叶片5种元素含量均无显著影响,但可显著提高树根、树枝和树干的N和P含量; N添加能显著提高凋落叶片的N含量,降低凋落叶片的C/N比和叶片N再吸收效率。研究结果反映出研究区兴安落叶松人工林土壤N并不缺乏。N添加导致兴安落叶松对N和P的奢侈吸收,可提高凋落物的分解速率,加快兴安落叶松人工林生态系统的N循环。

关键词: N添加, 兴安落叶松, 养分循环, 养分再吸收, 奢侈吸收

Abstract:

A field experiment was performed in an 18-year-old Larix gmelinii plantation in Maoershan Forest Research Station of Northeast Forestry University to study the effects of N(NH4NO3,10 g·m-2a-1) addition on the contents of N,P,K,Ca and Mg in different tree components and leaf nutrient resorption efficiency in Larix gmelinii after five years of continuous N addition.The results showed that N addition had no significant influence on leaf nutrient contents,but significantly increased N and P contents in roots,branches and stems.N addition significantly increased N conctents and decreased C/N ratio in senesced leaves,and decreased leaf N resorption efficiency.The responses of leaf nutrient conctents and tree biomass to N addition suggested that soil N availability was not the limiting factor to tree growth in Larix gmelinii plantation.N addition resulted in the luxury consumption of N and P,made senesced leaves more decomposable,and accelerated N cycling.

Key words: N addition, Larix gmelinii, nutrient cycling, nutrient resorption, luxury consumption