植物生态学报 ›› 2012, Vol. 36 ›› Issue (4): 346-352.DOI: 10.3724/SP.J.1258.2012.00346

所属专题: 稳定同位素生态学 全球变化与生态系统 生态学研究的技术和方法

• 综述 • 上一篇    下一篇

15N自然丰度法在陆地生态系统氮循环研究中的应用

姚凡云1,2,*(),朱彪3,杜恩在1   

  1. 1北京大学城市与环境学院生态学系, 北京大学地表过程分析与模拟教育部重点实验室, 北京 100871
    2北京大学深圳研究生院城市设计与规划学院, 深圳 518055
    3康奈尔大学园艺系, 纽约 14853
  • 收稿日期:2011-10-18 接受日期:2012-01-16 出版日期:2012-10-18 发布日期:2012-03-28
  • 通讯作者: 姚凡云

Use of 15N natural abundance in nitrogen cycling of terrestrial ecosystems

YAO Fan-Yun1,2,*(),ZHU Biao3,DU En-Zai1   

  1. 1Department of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of Ministry of Education, Peking University, Beijing 100871, China
    2School of Urban Planning and Design, Peking University, Shenzhen Graduate School, Shenzhen 518055, China
    3Department of Horticulture, Cornell University, New York 14853, USA
  • Received:2011-10-18 Accepted:2012-01-16 Online:2012-10-18 Published:2012-03-28
  • Contact: YAO Fan-Yun

摘要:

随着氮沉降的不断增加以及人们对全球变化问题的日益关注, 稳定同位素技术在全球变化研究中得到广泛的应用。因为植物和土壤的氮同位素组成记录了氮循环影响因子的综合作用, 并且具有测量简单以及不受取样时间和空间限制的优点, 所以氮同位素自然丰度法被用于氮循环的研究中。该文从氮循环过程中植物和土壤的氮分馏入手, 总结国内外相关文献, 阐述了植物和土壤氮自然丰度在预测生态系统氮饱和和氮循环长期变化趋势中的应用; 总结了利用树轮δ 15N法研究氮循环过程中应该注意的事项以及目前尚未解决的问题。

关键词: 氮循环, 植物, 土壤, δ 15N

Abstract:

Stable isotope technique has been widely used in ecology research with the increasing concern on global change. Our objectives are to better understand the impacts of nitrogen addition and other environment changes on the nitrogen cycling of terrestrial ecosystem, predict the consequent changes in environmental conditions, and provide a reference for policy making to help ensure the sustainable development of terrestrial ecosystems. Based on the relationship between nitrogen (N) isotope composition (δ 15N) in ecosystem N status and soil N cycle, we summarized the effects and mechanisms of N input and other environment changes on δ 15N of plant and soil. Most studies show significant positive relationships between N input and δ 15N values of plant and soil. Higher N input increases soil N availability, which leads to 15N enrichment in soil because of mass discrimination during soil N cycling processes. Foliar δ 15N also will be higher as plants take up the relatively 15N-enriched soil available N. 15N natural abundance can be a useful tool for assessing nitrogen saturation and N cycling.

Key words: nitrogen cycling, plant, soil, δ 15N