Plant traits of grass and legume species for flood resilience and N2O mitigation

Flooding threatens the functioning of managed grasslands by decreasing primary productivity and increasing nitrogen losses, notably as the potent greenhouse gas nitrous oxide (N2O). Sowing species with traits that promote flood resilience and mitigate flood-induced N2O emissions within these grasslands could safeguard their productivity while mitigating nitrogen losses. We tested how plant traits and resource acquisition strategies could predict flood resilience and N2O emissions of 12 common grassland species (eight grasses and four legumes) grown in field soil in monocultures in a 14-week greenhouse experiment. We found that grasses were more resistant to flooding, while legumes recovered better. Resource-conservative grass species had higher resistance, while resource-acquisitive grasses species recovered better. Resilient grass and legume species lowered cumulative N2O emissions. Grasses with lower inherent leaf and root δ13C (and legumes with lower root δ13C) lowered cumulati...洪水通过降低初级生产力、加剧氮素损失——尤其是作为强效温室气体的一氧化二氮（nitrous oxide, N2O）——威胁人工管理草地的正常功能。在这类草地中播种具备提升抗涝能力、缓解洪水诱导的一氧化二氮排放性状的物种，既能保障草地生产力，又能减少氮素损失。 本研究开展了为期14周的温室试验，将12种常见草地物种（8种禾草与4种豆科植物）以单作形式种植于田间土壤中，探究植物性状与资源获取策略能否预测其抗涝性及一氧化二氮排放情况。 研究结果显示，禾草的抗涝性更强，而豆科植物的灾后恢复能力更佳。资源保守型禾草具备更高的抗涝性，资源获取型禾草的恢复能力则更优。具备较强抗涝恢复能力的禾草与豆科植物，可降低累积一氧化二氮排放量。固有叶碳同位素δ¹³C与根碳同位素δ¹³C值更低的禾草（以及根碳同位素δ¹³C值更低的豆科植物）可降低累积...