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Human impact on the nitrogen cycle is diverse. Agricultural and industrial nitrogen (N) inputs to the environment currently exceed inputs from natural N fixation. As a consequence of anthropogenic inputs, the global nitrogen cycle (Fig. 1) has been significantly altered over the past century. Global atmospheric nitrous oxide (N2O) mole fractions have increased from a pre-industrial value of ~270 nmol/mol to ~319 nmol/mol in 2005. Human activities account for over one-third of N2O emissions, most of which are due to the agricultural sector. This article is intended to give a brief review of the history of anthropogenic N inputs, and reported impacts of nitrogen inputs on selected terrestrial and aquatic ecosystems.
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Jeannine Cavender-Bares is a Distinguished McKnight University Professor at the University of Minnesota in the Department of Ecology, Evolution & Behavior. Her research integrates evolutionary biology, ecology, and physiology by studying the functional traits of plants, with a particular focus on oaks.
Ingrid C. "Indy" Burke is the Carl W. Knobloch, Jr. Dean at the Yale School of Forestry & Environmental Studies. She is the first female dean in the school's 116 year history. Her area of research is ecosystem ecology with a primary focus on carbon cycling and nitrogen cycling in semi-arid rangeland ecosystems. She teaches on subjects relating to ecosystem ecology, and biogeochemistry.
Jiquan Chen is a landscape ecologist, primarily focused on nutrient flux, carbon cycling, bioenergy, and grassland ecology. He currently leads the LEES lab at Michigan State University.
Yude Pan is a senior research scientist with the Climate, Fire, and Carbon Cycle Sciences group of the Northern Research Station, USDA Forest Service, and a senior investigator of the Harvard Forest at Harvard University. Her work is in the fields of Ecosystem ecology and Global Change Biology. She studies terrestrial ecosystems and how environmental stressors affect complex interactions within those ecosystems. Much of her research focuses on forest ecosystems and how they relate to the carbon cycle as a whole, as well as forecasting complex effects of land use, climate change and air pollution on forest ecosystems.
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References
- ↑ "John Aber Awarded University Professorship", UNH Campus Journal, April 22, 2009, retrieved February 19, 2015
- 1 2 "John D. Aber in the University of New Hampshire" . Retrieved February 17, 2015.
- 1 2 "John D. Aber in the University of New Hampshire Department of Natural Resources & the Environment" . Retrieved February 17, 2015.
- ↑ "Yale University Graduate School to honor four alumni". October 5, 2010. Retrieved February 18, 2015.
- 1 2 3 "Good Reads" . Retrieved February 18, 2015.
- ↑ "Forests in Time" . Retrieved 18 February 2015.
