Effect of N and P fertilization on the allocation and fixation of photosynthesized carbon in paddy soil
| Autor: | Yaoyao Tong, Jinshui Wu, Ahmed E. Fahmy, Anna Gunina, Zhenke Zhu, Yangwu Deng, Mostafa Zhran, Ming Chen, Tin Mar Lynn, Tida Ge |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Rhizosphere
paddy soil Ecology Chemistry Bulk soil chemistry.chemical_element Management Monitoring Policy and Law Fixation (surgical) Human fertilization Agronomy fertilization 13co2 continuous labeling carbon input bulk soil rhizosphere Carbon Ecology Evolution Behavior and Systematics QH540-549.5 |
| Zdroj: | Ecosystem Health and Sustainability, Vol 7, Iss 1 (2021) |
| DOI: | 10.6084/m9.figshare.15094467 |
| Popis: | Potted rice seedlings independently treated with N, P, and NP were continuously 13 CO2 labeled to investigated the influence of N and P application on the contribution of photosynthesized C to the rhizosphere versus bulk soil and particulate organic matter (POM) versus mineral fraction (MIN). N and NP enhanced net assimilated 13 C on day 14 (D14), with maximum C assimilation occurring on day 22 (D22) under NP. Aboveground biomass retained more 13 C than belowground biomass for all treatments. 13C incorporation into the rhizosphere exceeded that in bulk soil, with the maximum (6–10%) found under N addition. Newly assimilated 13 C incorporated into POM increased in the rhizosphere under N and NP conditions, whereas MIN remained largely unaffected. 13 C-MBC proportion in the total microbial biomass C (MBC) pool revealed that N and NP stimulated microbial activity to a greater degree than P. The main portion of 13 C in the rhizosphere and bulk soil was found in POM on D14, which decreased over time due to microbial utilization. Contrastingly, root-derived 13 C in the MIN remained unchanged between sampling days, which indicates that the stabilization of rhizodeposits in this fraction might be the potential mechanism underlying SOM sequestration in paddy soils. |
| Databáze: | OpenAIRE |
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