| Value |
100
TgN/yr
|
| Organism |
Biosphere |
| Reference |
Galloway JN et al, Transformation of the nitrogen cycle: recent trends, questions, and potential solutions. Science. 2008 May 16 320(5878):889-92. p. 889 right column, bottom paragraphPubMed ID18487183
|
| Primary Source |
J. N. Galloway et al., Biogeochemistry 70, 153 (2004). |
| Comments |
It is estimated that in
1860, 34 Tg N yr-1 of Nr was emitted as NOx
and NH3 and then deposited to the Earth’s surface
as NOy and NHx in 1995, it had increased
to 100 Tg N yr-1 by 2050, it is projected to be
200 Tg N yr-1 (primary source). N deposition to ecosystems in the absence of human influence is generally ~0.5 kg N ha-1 yr-1 or less (F. Dentener et al., Global Biogeochem. Cycles 20,
GB4003 (2006).). There are now large regions of the world where average N deposition rates exceed 10 kgNha-1 yr-1. Note-fig. 2 p. 891 gives value of 105 TgNy-1 |
| Entered by |
Ben Marks |
| ID |
101568 |