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Chapter 03_lecture
Chapter 03_lecture

... Step 2 - Assimilation Nitrogen assimilated into tissues ...
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3.2 PPT - MsMullin
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< 1 ... 270 271 272 273 274 275 276 277 278 ... 290 >

Human impact on the nitrogen cycle



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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