| 摘要: |
| 通过分析大气活性氮对广布野生植物葎草(Humulus scandens)叶片氮的影响,探索葎草作为大气氮沉降指示植物的可能性。试验采集了华北平原6个地点的葎草植物叶片,测量叶片全氮、δ15N值及其生境附近的大气活性氮(NH3-N和NO2-N)浓度。研究发现葎草叶全氮含量与大气中NH3-N浓度有很强的相关性,而与NO2-N及大气总活性氮浓度相关性很小;叶δ15N值与NH3-N和大气中总活性氮浓度均显著相关,而与NO2-N关系不显著。植物嫩叶比成熟叶的全氮含量更高,嫩叶δ15N对NH3浓度变化也更敏感。本研究结果初步表明,葎草嫩叶的全氮含量和δ15N值对NH3-N浓度有较好的指示作用,但此结论仍需更多实验数据的支持。 |
| 关键词: 大气活性氮 氮沉降 植物监测 葎草 嫩叶 δ 15N |
| DOI：10.11841/j.issn.1007-4333.2010.01.015 |
| 投稿时间：2009-04-26 |
| 基金项目:农业部公益行业计划项目(200803030); 国家自然科学基金项目(40973054); 国家"十一五"科技支撑计划重点项目(2008BADA4B02)第一作者:沈健林,博士研究生,E-mail:jianlinshen@gmail.com通讯作者:韩文轩,副教授,主要从事生态化学计量学、环境养分及植物开发研究,E-mail:hanwenxuan@cau.edu.cn |
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| Relationships of leaf nitrogen concentration and δ15N value in Humulus scandens with atmospheric NH3 and NO2 |
|
SHEN Jian-lin, HUANG Ming-li, TANG Ao-han, WANG Si-miao, HAN Wen-xuan, LIU Xue-jun
|
| (College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China) |
| Abstract: |
| Bioindication of nitrogen (N) deposition is concerned by environmental scientists, but few higher plants have been reported to indicate variations in atmospheric N deposition. Leaf total N concentration and δ15N value of a wide-spread herbaceous creeper Humulus scandens from the six sites in the North China Plain were investigated, together with the atmospheric reactive N concentrations at each site, to explore the impact of N deposition on H. scandens, and the possibility of H. scandens as a bioindictor of N deposition. The results showed that there was a strong correlation between leaf total N and atmospheric NH3-N, and a weak correlation between leaf total N and atmospheric NO2-N or total atmospheric reactive N. The tender leaves had higher N concentration and δ15N value, and showed a steeper slope of leaf total N and δ15N along the gradient of atmospheric NH3-N concentration, compared with the adult ones of H. scandens. Our study suggests that H. scandens might serve as a potential bioindicator of atmospheric NH3-N concentration and deposition with the N concentration and δ15N value in its tender leaves being analyzed, though further evidence is needed. |
| Key words: atmospheric reactive nitrogen nitrogen deposition bioindication Humulus scandens tender leaf δ15N |
