Abstract
Abstract Boreal forest soil organic carbon (SOC) plays a critical role in mitigating climate change due to its large contribution to the global terrestrial carbon sink. However, the effects of nitrogen (N) deposition on SOC accumulation remain poorly understood in boreal forests. Thus, we conducted a long‐term N addition experiment in a boreal forest to investigate whether and how N addition affects SOC, as well as how this effect is regulated by plant–soil–microbe synergies. We found that SOC significantly increased with N addition, driven by the combined responses of plants, soil and microbes. Specifically, N addition enhanced plant nutrient uptake and photosynthetic capacity, leading to increased plant carbon input. N addition also induced soil acidification due to shifts in plant N preferences, which suppressed decomposition and altered microbial communities by enhancing microbial carbon use efficiency toward higher carbon stabilization. Synthesis . Our study provides a holistic mechanistic understanding of how N addition enhances SOC sequestration through plant–soil–microbe interactions.
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Claims 6
Claim · model-written summary
Nitrogen addition significantly increased soil organic carbon.
Not reportedComparator
Schema note from the model: Soil endpoint of a plant–soil–microbe experiment
Verbatim
e0“SOC significantly increased with N addition”
t0“plant”
Claim · model-written summary
Nitrogen addition enhanced plant nutrient uptake and photosynthetic capacity.
- Taxon
- plante0
- Treatment
- N additione0
- Outcome
- plant nutrient uptake and photosynthetic capacitye0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“N addition enhanced plant nutrient uptake and photosynthetic capacity”
Claim · model-written summary
Enhanced plant function led to increased plant carbon input.
Verbatim
e0“leading to increased plant carbon input”
Claim · model-written summary
Nitrogen addition induced soil acidification through shifts in plant nitrogen preferences.
Verbatim
e0“N addition also induced soil acidification due to shifts in plant N preferences”
Claim · model-written summary
Soil acidification suppressed decomposition.
Verbatim
e0“which suppressed decomposition”
t0“plant”
Claim · model-written summary
Nitrogen addition altered microbial communities and enhanced microbial carbon use efficiency toward carbon stabilization.
Verbatim
e0“altered microbial communities by enhancing microbial carbon use efficiency toward higher carbon stabilization”
t0“plant”