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Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink.
- Source :
- Nature Communications; 2/15/2022, Vol. 13 Issue 1, p1-9, 9p
- Publication Year :
- 2022
-
Abstract
- The impacts of enhanced nitrogen (N) deposition on the global forest carbon (C) sink and other ecosystem services may depend on whether N is deposited in reduced (mainly as ammonium) or oxidized forms (mainly as nitrate) and the subsequent fate of each. However, the fates of the two key reactive N forms and their contributions to forest C sinks are unclear. Here, we analyze results from 13 ecosystem-scale paired <superscript>15</superscript>N-labelling experiments in temperate, subtropical, and tropical forests. Results show that total ecosystem N retention is similar for ammonium and nitrate, but plants take up more labelled nitrate ( 20 15 25 %) ( mean minimum maximum ) than ammonium ( 12 8 16 %) while soils retain more ammonium ( 57 49 65 %) than nitrate ( 46 32 59 %). We estimate that the N deposition-induced C sink in forests in the 2010s is 0.72 0.49 0.96 Pg C yr<superscript>−1</superscript>, higher than previous estimates because of a larger role for oxidized N and greater rates of global N deposition. A study using paired <superscript>15</superscript>N tracers shows atmospheric N deposited in oxidized form is more likely retained by trees, while the reduced form is retained in soil. The authors argue that this is a greater contribution of deposited N to the global forest C sink than previously reported. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBON cycle
REACTIVE nitrogen species
TROPICAL forests
ECOSYSTEM services
AMMONIUM
Subjects
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 13
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 155261851
- Full Text :
- https://doi.org/10.1038/s41467-022-28345-1