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Tree species composition influences nitrogen loss from forests
Date:3/16/2009

particularly susceptible to nitrogen leaching, while soils under red oak and hemlock forests are better at retaining nitrogen and preventing leaching losses. This difference was partially related to the ratio of carbon to nitrogen in the soils. The microbes under the different tree species vary considerably in their production of nitrate, the form of nitrogen that is most readily leached into streams. However, unlike previous studies from western forests, this study found very little consumption of nitrate by the soil microbes in any of the forest types. Because of the low nitrate consumption, the forest types that have high nitrate production (such as sugar maple) also have high nitrate losses via leaching.

Lead author Lynn Christenson of Vassar College in Poughkeepsie, NY noted, "The most significant difference we see in nitrogen cycling under sugar maple trees compared to other tree species are much higher rates of nitrification, with very little consumption of this nitrate occurring in sugar maple soils. Why the soils and trees are not consuming this nitrogen is still a mystery."

Project Leader Gary Lovett of the Cary Institute of Ecosystem Studies in Millbrook, NY stated, "It is important for watershed managers to know that differences in tree species composition can influence nitrogen retention. Some forest types are more likely to saturate with nitrogen than others."


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Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Page: 1 2

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