| Autor: |
Jiang, Mingkai, Crous, Kristine Y., Carrillo, Yolima, Macdonald, Catriona A., Anderson, Ian C., Boer, Matthias M., Farrell, Mark, Gherlenda, Andrew N., Castañeda-Gómez, Laura, Hasegawa, Shun, Jarosch, Klaus, Milham, Paul J., Ochoa-Hueso, Rául, Pathare, Varsha, Pihlblad, Johanna, Piñeiro, Juan, Powell, Jeff R., Power, Sally A., Reich, Peter B., Riegler, Markus, Zaehle, Sönke, Smith, Benjamin, Medlyn, Belinda E., Ellsworth, David S. |
| Zdroj: |
Nature; June 2024, Vol. 630 Issue: 8017 p660-665, 6p |
| Abstrakt: |
The capacity for terrestrial ecosystems to sequester additional carbon (C) with rising CO2concentrations depends on soil nutrient availability1,2. Previous evidence suggested that mature forests growing on phosphorus (P)-deprived soils had limited capacity to sequester extra biomass under elevated CO2(refs. 3–6), but uncertainty about ecosystem P cycling and its CO2response represents a crucial bottleneck for mechanistic prediction of the land C sink under climate change7. Here, by compiling the first comprehensive P budget for a P-limited mature forest exposed to elevated CO2, we show a high likelihood that P captured by soil microorganisms constrains ecosystem P recycling and availability for plant uptake. Trees used P efficiently, but microbial pre-emption of mineralized soil P seemed to limit the capacity of trees for increased P uptake and assimilation under elevated CO2and, therefore, their capacity to sequester extra C. Plant strategies to stimulate microbial P cycling and plant P uptake, such as increasing rhizosphere C release to soil, will probably be necessary for P-limited forests to increase C capture into new biomass. Our results identify the key mechanisms by which P availability limits CO2fertilization of tree growth and will guide the development of Earth system models to predict future long-term C storage. |
| Databáze: |
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