葎草(Humulus scandens)叶总氮和δ^(15)N与大气活性氮气体的关系  

Relationships of leaf nitrogen concentration and δ^(15)N value in Humulus scandens with atmospheric NH_3 and NO_2

作　　者：沈健林[1] 黄明丽[1] 唐傲寒[1] 汪斯淼[1] 韩文轩[1] 刘学军[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《中国农业大学学报》2010年第1期84-88,共5页Journal of China Agricultural University

基　　金：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)

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。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.

关 键 词：大气活性氮 氮沉降 植物监测 葎草 嫩叶 δ15N 

分 类 号：X51[环境科学与工程—环境工程] Q143.4[生物学—生态学]