Use of ^(15)N stable isotope to quantify nitrogen transfer between mycorrhizal plants

作     者：Xinhua He Minggang Xu Guo Yu Qiu Jianbin Zhou 

作者机构：School of Life SciencesYunnan Normal UniversityKunmingYunnan 650092China School of Plant Biology(M084)University of Western AustraliaCrawleyWestern Australia 6009Australia Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Key Laboratory for Environmental and Urban SciencesShenzhen Graduate SchoolPeking UniversityShenzhen 518055China State Key Laboratory of Earth Surface Processes and Resource EcologyBeijing Normal UniversityBeijing 100875China College of Resource and Environmental SciencesNorthwest A&F UniversityYanglingShaanxi 712100China 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2009年第2卷第3期

页      面：107-118页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0901[农学-作物学] 0902[农学-园艺学] 0713[理学-生态学] 

主　　题：^(15)N enrichment ^(15)N natural abundance(^(15)N) ^(15)N stable isotope common mycorrhizal networks(CMNs) nitrogen transfer 

摘      要：Aims Mycorrhizas(fungal roots)play vital roles in plant nutrient acquisition,performance and productivity in terrestrial *** mycorrhizas(AM)and ectomycorrhizas(EM)are mostly important since soil nutrients,including NH+4,NO
3 and phosphorus,are translocated from mycorrhizal fungi to *** species,genera and even families of plants could be interconnected by mycorrhizal mycelia to form common mycorrhizal networks(CMNs).The function of CMNs is to provide pathways for movement or transfer of nutrients from one plant to *** the past four decades,both ^(15)N external labeling or enrichment(usually expressed as atom%)and ^(15)N naturally occurring abundance(d^(15)N,&)techniques have been employed to trace the direction and magnitude of N transfer between plants,with their own advantages and *** Findings The heavier stable isotope ^(15)N is discriminated against 14N during biochemical,biogeochemical and physiological processes,due to a greater atomic *** general,non-N2-fixing plants had greater d^(15)N values than N2-fixing(;0&)*** d^(15)N often varied by 5 to 10&in the order:non-mycorrhizas/AMsEMsericoid *** in d^(15)N(&)or ^(15)N(atom%)values could thus provide N transfer information between plants.A range of between 0 to 80%of one-way N transfer had been observed from N2-fixing mycorrhizal to non-N2-fixing mycorrhizal plants,but generally less than or around 10%in the reverse ***-to-plant N transfer may provide practical implications for plant performance in N-limited *** that N translocation or cycling is crucial,and the potential benefits of N transfer are great in both agricultural and natural ecosystems,more research is warranted on either oneway or two-way N transfers mediated by CMNs with different species and under field conditions.