Reciprocal N (15NH4+ or 15NO3−) transfer between nonN2‐fixing Eucalyptus maculata and N2‐fixing Casuarina cunninghamiana linked by the ectomycorrhizal fungus Pisolithus sp.
作者： Xinhua He , Christa Critchley , Hock Ng , Caroline Bledsoe
DOI: 10.1111/J.1469-8137.2004.01137.X
关键词:
摘要: Two-way N transfers mediated by Pisolithus sp. were examined excluding root contact and supplying (NH4+)-N-15 or (NO3-)-N-15 to 6-month-old Eucalyptus maculata Casuarina cunninghamiana grown in two-chambered-pots separated 37 m screens. Mycorrhizal colonization was 35% 66% (c. 29% N-2-fixation). Using an environmental scanning electron microscope, living hyphae observed interconnect Casuarina. Biomass accumulation greatest nodulated mycorrhizal Casuarina/mycorrhizal pairs, less nonnodulated least nonmycorrhizal Casuarina/nonmycorrhizal pairs. In similar (2.4-4.1 mg per plant either direction) 2.6-4.0 times greater than (5-7 times) (12-18 Net transfer low both (< 0.7 plant) pairs 1.1 plant). net 26.0 plant. The amount direction of two-way mycorrhiza-mediated increased the presence Frankia, resulting a from low-N-demanding high-N-demanding
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