N supply mediates the radiative balance of N ₂ O emissions and CO ₂ sequestration driven by N?fixing vs. non?fixing trees

Forests are a significant CO2 sink. However, sequestration in forests is radiatively offset by emissions of nitrous oxide (N2O), potent greenhouse gas, from forest soils. Reforestation, an important strategy for mitigating climate change, has focused on maximizing plant biomass without integrating N2O Although nitrogen (N)-fixing trees often recommended reforestation because their rapid growth N-poor soil, they can stimulate Here, we first used field experiment to show that N-fixing tree (Robinia pseudoacacia) initially mitigated change more than non-fixing (Betula nigra). We then our data parameterize theoretical model investigate these effects over time. Under lower N supply, N-fixers continued mitigate non-fixers overcoming limitation growth. under higher ultimately less enriching soil and stimulating These results have implications reforestation, suggesting effective at whereas supply.