Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1111/gcb.17405 |
Licence  |
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| Title (Primary) | Not all soil carbon is created equal: Labile and stable pools under nitrogen input |
| Author | Zang, H.; Mehmood, I.; Kuzyakov, Y.; Jia, R.; Gui, H.; Blagodatskaya, E.; Xu, X.; Smith, P.; Chen, H.; Zeng, Z.; Fan, M. |
| Source Titel | Global Change Biology |
| Year | 2024 |
| Department | BOOEK |
| Volume | 30 |
| Issue | 7 |
| Page From | e17405 |
| Language | englisch |
| Topic | T5 Future Landscapes |
| Data and Software links | https://doi.org/10.6084/m9.figshare.26057608.v2 |
| Keywords | 13C natural abundance; labile C pools; microbial biomass; microbial community; nutrient availability; SOM decomposition; stable C pools |
| Abstract | Anthropogenic activities have raised nitrogen (N) input worldwide with profound implications for soil carbon (C) cycling in ecosystems. The specific impacts of N input on soil organic matter (SOM) pools differing in microbial availability remain debatable. For the first time, we used a much-improved approach by effectively combining the 13C natural abundance in SOM with 21 years of C3–C4 vegetation conversion and long-term incubation. This allows to distinguish the impact of N input on SOM pools with various turnover times. We found that N input reduced the mineralization of all SOM pools, with labile pools having greater sensitivity to N than stable ones. The suppression in SOM mineralization was notably higher in the very labile pool (18%–52%) than the labile and stable (11%–47%) and the very stable pool (3%–21%) compared to that in the unfertilized control soil. The very labile C pool made a strong contribution (up to 60%) to total CO2 release and also contributed to 74%–96% of suppressed CO2 with N input. This suppression of SOM mineralization by N was initially attributed to the decreased microbial biomass and soil functions. Over the long-term, the shift in bacterial community toward Proteobacteria and reduction in functional genes for labile C degradation were the primary drivers. In conclusion, the higher the availability of the SOM pools, the stronger the suppression of their mineralization by N input. Labile SOM pools are highly sensitive to N availability and may hold a greater potential for C sequestration under N input at global scale. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=29388 |
| Zang, H., Mehmood, I., Kuzyakov, Y., Jia, R., Gui, H., Blagodatskaya, E., Xu, X., Smith, P., Chen, H., Zeng, Z., Fan, M. (2024): Not all soil carbon is created equal: Labile and stable pools under nitrogen input Glob. Change Biol. 30 (7), e17405 10.1111/gcb.17405 |
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