Human activity, such as agricultural fertilizer use, has increased the amount of nitrogen deposited onto forests from the atmosphere. The photosynthetic response to this in evergreen needleleaf forests has been quantified globally.
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Law, B. Nitrogen deposition and forest carbon. Nature 496, 307–308 (2013). https://doi.org/10.1038/496307a
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DOI: https://doi.org/10.1038/496307a
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