Interspecific temporal and spatial differences in the acquisition of litter-derived nitrogen by ectomycorrhizal fungal assemblages.
Interspecific temporal and spatial differences in the acquisition of litter-derived nitrogen by ectomycorrhizal fungal assemblages.
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DOI：
10.1111/nph.12272
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发表时间：
2013-07
期刊：
影响因子：
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通讯作者：
Rodica Pena;J. Tejedor;B. Zeller;M. Dannenmann;A. Polle
中科院分区：
文献类型：
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作者：
Rodica Pena;J. Tejedor;B. Zeller;M. Dannenmann;A. Polle
的时空动态，种间差异，收购凋落物衍生的氮（N）的自然组合外生菌根根尖知之甚少。小圆柱形网袋（15）N-标记山毛榉（山毛榉）落叶，允许菌丝，但不允许根向内生长垂直插入到一个古老的山毛榉森林的表层土壤层。在18个月的暴露期内，测量了（15）N向周围土壤、根系、微生物和外生菌根的侧向转移。外生菌根真菌（EMF）表现出很大的种间变异的时间模式和程度的（15）N积累。最初，当N主要来自渗滤液时，微生物在N固定方面比大多数EMF更有效，但不同的真菌物种也显示出显着的N积累。在生长后期，（15）N在巴迪亚毛门藻中的富集程度高于微生物和其他EMF物种。根和土壤积累（15）N与微生物和EMF相比有很大的延迟。因为大约一半的研究真菌物种直接获得N从落叶和其余的N从沥滤化合物，我们建议，EMF多样性有利于N利用的主机通过捕获N来自早期释放的溶质和后期降解产物从柠檬酸来源。
The spatiotemporal dynamics of, and interspecific differences in, the acquisition of litter-derived nitrogen (N) by natural assemblages of ectomycorrhizal root tips are poorly understood. Small cylindrical mesh bags containing (15)N-labelled beech (Fagus sylvatica) leaf litter that permit hyphal but not root ingrowth were inserted vertically into the top soil layer of an old-growth beech forest. The lateral transfer of (15)N into the circumjacent soil, roots, microbes and ectomycorrhizas was measured during an 18-month exposure period. Ectomycorrhial fungi (EMF) showed large interspecific variation in the temporal pattern and extent of (15)N accumulation. Initially, when N was mainly available from the leachate, microbes were more efficient at N immobilization than the majority of EMF, but distinct fungal species also showed significant (15)N accumulation. During later phases, the enrichment of (15)N in Tomentella badia was higher than in microbes and other EMF species. Roots and soil accumulated (15)N with a large delay compared with microbes and EMF. Because approximately half of the studied fungal species had direct access to N from leaf litter and the remainder to N from leached compounds, we suggest that EMF diversity facilitates the N utilization of the host by capturing N originating from early-released solutes and late degradation products from a recalcitrant source.