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Forest canopies help determine natural fertilization rates
Date:5/30/2008

s. The cyanobacteria reside on the leaves, thus the nitrogen status of the canopy throughfall directly influences nitrogen fixation in the feather mosses. This direct expression of a nutrient feedback mechanism could not be detected in other nitrogen fixing plant species, such as legumes, that house their nitrogen fixing bacteria below ground and where soils and decomposing litter intercept and modify the nitrogen from throughfall before it reaches the bacteria.

These findings are important from a global standpoint, because feather mosses (and associated cyanobacteria) are the primary source of biologically fixed nitrogen in the boreal forest biome. The dominating feathermoss Pleurozium schreberi is also found in arctic and temperate biomes and thus may be the widest distributed individual nitrogen-fixing plant species on Earth. Understanding feed back mechanisms among dominating organisms that regulate fundamental ecosystem processes are integral to our ability to predict long term outcomes of global carbon dynamics.


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Contact: Dr. Thomas H. DeLuca
tom_deluca@tws.org
406-586-1600 x110
Swedish University of Agricultural Sciences
Source:Eurekalert

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