Nitrification-induced acidity controls CO2 emission from soil carbonates
- verfasst von
- Jingjing Tao, Lichao Fan, Jianbin Zhou, Callum Colin Banfield, Yakov Kuzyakov, Kazem Zamanian
- Abstract
Nitrification acidifies soil, and the produced H
+ are neutralized by inorganic carbon (C) in soil leading to irreversible CO
2 emissions. CO
2 released by nitrogen (N) fertilizer-induced acidification is partitioned between solid (CaCO
3 re-precipitation), liquid (dissolved HCO
3
− and CO
3
2−) and gaseous (CO
2) phases. Therefore, quantifying the effects of N fertilization on CO
2 emissions from soil inorganic C is an enormous challenge.
14C-labeled CaCO
3 was used as a model inorganic C to trace the released CO
2 caused by acidification by five fertilizers: chicken manure, urea, KNO
3, NH
4NO
3, and (NH
4)
2SO
4 added at three N rates. Cropland soil was homogenously mixed with Ca
14CO
3 powder and fertilizers, and the emitted CO
2 was trapped in NaOH solution to determine total CO
2 and
14CO
2 efflux originated from inorganic C. Fertilization, particularly ammonium-based fertilizers ((NH
4)
2SO
4, NH
4NO
3), strongly decreased soil pH by 0.35 units over 40 days. All fertilizers except KNO
3 increased total CO
2 emissions by 21%–490% compared to the unfertilized control soil. The fertilization effects on cumulative
14CO
2 emission induced by CaCO
3 neutralization, corresponded to acidification and decreased in the order (NH
4)
2SO
4 > NH
4NO
3 > urea > KNO
3 > chicken manure. Ammonium-based fertilizers induced the strongest CO
2 emissions originated from inorganic C, emitting 1.6–4.5 times more
14CO
2 than non-fertilized soils during the first nine days. The total CO
2 emissions from SIC were proportional to the fertilizer dose applied. Therefore, we conclude that both the choice of N fertilizers and their application rates need to be considered to control CO
2 emissions originated from inorganic C. The soil inorganic C losses should be prevented not only because of their irreversible contribution to atmospheric CO
2, but also to safeguard ecosystem services of CaCO
3, such as organic matter preservation, soil structure stabilization, and C sequestration.
- Organisationseinheit(en)
-
Institut für Bodenkunde
AG Bodenchemie
- Externe Organisation(en)
-
Northwest Agriculture and Forestry University
Eberhard Karls Universität Tübingen
Georg-August-Universität Göttingen
Kazan State Technical University
Peoples' Friendship University of Russia (RUDN)
Nanjing University of Information Science and Technology
- Typ
- Artikel
- Journal
- Soil Biology and Biochemistry
- Band
- 192
- ISSN
- 0038-0717
- Publikationsdatum
- 05.2024
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Bodenkunde, Mikrobiologie
- Ziele für nachhaltige Entwicklung
- SDG 2 – Kein Hunger
- Elektronische Version(en)
-
https://doi.org/10.1016/j.soilbio.2024.109398 (Zugang:
Geschlossen)
