Summary
This study, published in Nature, demonstrates that in a mature forest ecosystem, competition between plants and soil microorganisms for phosphorus limits the ability of trees to increase growth in response to elevated atmospheric CO₂. The findings suggest that phosphorus availability, rather than carbon or nitrogen, acts as a key constraint on the CO₂ fertilisation effect in phosphorus-limited forest systems. This has important implications for understanding long-term carbon sequestration potential in forests under future climate scenarios.
UK applicability
UK temperate forests may experience similar phosphorus constraints, particularly on naturally phosphorus-limited soils common in upland regions. The findings support the need for soil fertility assessments in UK woodland management and carbon sequestration schemes to account for nutrient limitation.
Key measures
Tree biomass accumulation, net primary productivity, soil phosphorus availability, microbial phosphorus uptake, CO₂ response ratio
Outcomes reported
The study investigated whether microbial competition for phosphorus constrains the ability of mature forests to respond to elevated atmospheric CO₂. The research measured tree growth, carbon uptake, and soil microbial phosphorus dynamics under ambient and elevated CO₂ conditions.
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