{"id":160615,"date":"2010-11-01T00:00:00","date_gmt":"2010-11-01T00:00:00","guid":{"rendered":"https:\/\/new-cm-edgedigital.pages.dev\/en-us\/research\/msr-research-item\/facultative-nitrogen-fixation-by-canopy-legumes-in-a-lowland-tropical-forest\/"},"modified":"2018-10-16T21:53:47","modified_gmt":"2018-10-17T04:53:47","slug":"facultative-nitrogen-fixation-by-canopy-legumes-in-a-lowland-tropical-forest","status":"publish","type":"msr-research-item","link":"https:\/\/new-cm-edgedigital.pages.dev\/en-us\/research\/publication\/facultative-nitrogen-fixation-by-canopy-legumes-in-a-lowland-tropical-forest\/","title":{"rendered":"Facultative nitrogen fixation by canopy legumes in a lowland tropical forest"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Symbiotic dinitrogen (N2) fixation is often invoked to explain the N richness of tropical forests as ostensibly N2-fixing trees can be a major component of the community. Such arguments assume N2 fixers are fixing N when present. However, in laboratory experiments, legumes consistently reduce N2 fixation in response to increased soil N availability. These contrasting views of N2 fixation as either obligate or facultative have drastically different implications for the N cycle of tropical forests. We tested these models by directly measuring N2-fixing root nodules and nitrogenase activity of individual canopy-dominant legume trees (Inga sp.) across several lowland forest types. Fixation was substantial in disturbed forests and some gaps but near zero in the high N soils of mature forest. Our findings suggest that canopy legumes closely regulate N2 fixation, leading to large variations in N inputs across the landscape, and low symbiotic fixation in mature forests despite abundant legumes.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Symbiotic dinitrogen (N2) fixation is often invoked to explain the N richness of tropical forests as ostensibly N2-fixing trees can be a major component of the community. Such arguments assume N2 fixers are fixing N when present. However, in laboratory experiments, legumes consistently reduce N2 fixation in response to increased soil N availability. 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