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Molybdenum (Mo) and phosphorus (P) limitation and co-limitation of asymbiotic dinitrogen (N2) fixation has been reported in many ecosystems, from tropical to boreal. However, the mechanisms leading to these limitations remain elusive. In cold temperate forests Mo and P limitation of asymbiotic N2 fixation has been observed in gymnosperm litter but not in angiosperm litter suggesting an important role...
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