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Stanford scientists help shed light on key component of China's pollution problem
Date:2/26/2013

It's no secret that China is faced with some of the world's worst pollution. Until now, however, information on the magnitude, scope and impacts of a major contributor to that pollution human-caused nitrogen emissions was lacking.

A new study co-authored by Stanford biology professor and Stanford Woods Institute senior fellow Peter Vitousek reveals that amounts of nitrogen (from industry, cars and fertilizer) deposited on land and water in China by way of rain, dust and other carriers increased by 60 percent annually from the 1980s to the 2000s, with profound consequences for the country's people and ecosystems.

Xuejun Liu and Fusuo Zhang at China Agricultural University in Beijing led the study, which is part of an ongoing collaboration with Stanford aimed at reducing agricultural nutrient pollution while increasing food production in China a collaboration that includes Vitousek and Pamela Matson, dean of Stanford's School of Earth Sciences and a Stanford Woods Institute senior fellow.

The researchers analyzed all available data on bulk nitrogen deposition from monitoring sites throughout China from 1980 to 2010.

During the past 30 years, China has become by far the largest creator and emitter of nitrogen globally. The country's use of nitrogen as a fertilizer increased about threefold from the 1980s to 2000s, while livestock numbers and coal combustion increased about fourfold, and the number of automobiles about twentyfold (all of these activities release reactive nitrogen into the environment).

Increased levels of nitrogen have led to a range of deleterious impacts including decreased air quality, acidification of soil and water, increased greenhouse gas concentrations and reduced biological diversity.

"All these changes can be linked to a common driving factor: strong economic growth, which has led to continuous increases in agricultural and non-agricultural reactive nitrogen emissions and consequent
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Contact: Peter Vitousek
vitousek@stanford.edu
650-725-1866
Stanford University
Source:Eurekalert

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