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Forest Fires Help Power the Nitrogen Cycle

When fire burns down a forest, nitrate levels go up, and the effects are persistent, according to recent research from University of Montana scientists. They found that charcoal deposited during fire events has the potential to stimulate the conversion of ammonia to nitrates, an important step in the nitrogen cycle.

Led by Patrick Ball, the research team found that a type of bacteria that transforms ammonia into nitrates was found in greater abundance in recently burned sites, despite the fact that the “recent” fire was twelve years prior to the sampling period. In addition to the bacteria, the burned sites had greater rates of nitrification, meaning that nitrogen was being processed more quickly through the ecosystem than without a fire.

The study was reported in the July/August 2010 Journal of Environmental Quality, published by the American Society of Agronomy, the Crop Science Society of America, and the Soil Science Society of America.

Nitrogen is often a limiting nutrient in coniferous forests soils of the western United States, where this study was conducted. The research results reveal a link between fire, charcoal deposition, nitrification, and abundance of nitrifying organisms in coniferous forests of the inland Northwestern US.

Conducted on soils from sites that had been exposed twice or three times to fires in the last 94 years, the research team was able to demonstrate that charcoal can stimulate nitrate production well after the heat pulse and substrate pulse (and increased ammonium) has abated.

Additionally, an analysis of the bacterial community, though gene sequencing, revealed shifts in community structure based both on fire history and soil type. This suggests that these soils are possibly shifting toward supporting microbial groups typically found in more productive soils such as those in adjacent open mountain meadows.

The study was supported by the National Science Foundation.

The full article is available for no charge for 30 days following the date of this summary. View the abstract at

The Journal of Environmental Quality is a peer-reviewed, international journal of environmental quality in natural and agricultural ecosystems published six times a year by the American Society of Agronomy (ASA), Crop Science Society of America (CSSA), and the Soil Science Society of America (SSSA). The Journal of Environmental Quality covers various aspects of anthropogenic impacts on the environment, including terrestrial, atmospheric, and aquatic systems.

The American Society of Agronomy (ASA), is a scientific society helping its 8,000+ members advance the disciplines and practices of agronomy by supporting professional growth and science policy initiatives, and by providing quality, research-based publications and a variety of member services.

Sara Uttech | idw
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