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The global nitrogen cycle: past, present and future
1Environmental Sciences Department, University of Virginia, 22904, Charlottesville, Virginia, USA. jng@virginia.edu
Science in China. Series C, Life Sciences
|June 16, 2010
Summary
Human activities like food and energy production significantly increase reactive nitrogen, impacting global ecosystems. This study contrasts nitrogen distribution from the 19th to 20th centuries and projects future changes to the nitrogen cycle.
Area of Science:
- Environmental Science
- Biogeochemistry
- Ecology
Background:
- Industrialization and agriculture have dramatically increased reactive nitrogen (N) mobilization.
- Nitrogen cascades through environmental reservoirs, affecting human and ecosystem health.
- Understanding the global nitrogen cycle is crucial for environmental management.
Purpose of the Study:
- To examine the impact of increased nitrogen mobilization on the global nitrogen cycle.
- To contrast nitrogen distribution in the late-19th century with the late-20th century.
- To project the state of the global nitrogen cycle for the year 2050.
Main Methods:
- Comparative analysis of nitrogen distribution across different time periods (late-19th vs. late-20th century).
- Assessment of regional variations in nitrogen distribution.
- Modeling and projection of future nitrogen cycle dynamics.
Main Results:
- Significant shifts in global nitrogen distribution have occurred between the 19th and 20th centuries due to anthropogenic activities.
- Regional differences in nitrogen mobilization and impact are substantial.
- Projections indicate continued alterations to the global nitrogen cycle by 2050.
Conclusions:
- Increased nitrogen mobilization profoundly alters the global nitrogen cycle.
- Historical and current data highlight the escalating impact on ecosystems and human health.
- Future projections underscore the need for sustainable nitrogen management strategies.
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