In this study， Poa pratensis var. Qinghai was used as the research subject. The changing trends in leaf stoichiometric ratios and nutrient resorption efficiency under six phosphorus （P） addition levels （30， 45， 60， 75， 90， and 105 kg·hm^-2， sequentially labeled as P₁， P₂， P₃， P₄， P₅， and P₆） were investigated. The results indicated： （1） The leaf carbon （C）， nitrogen （N）， and P contents generally exhibited the pattern of senescent stage < full ripeness stage < milky ripeness stage， with the highest accumulation of leaf nutrient contents observed under the P₃ level. （2） Leaf C/N and C/P ratios generally followed the pattern of senescent stage > full ripeness stage > milky ripeness stage， while the N/P ratio generally showed full ripeness stage > milky ripeness stage > senescent stage. （3） The Nitrogen Reabsorption Efficiency （NRE） was the highest under the CK （control， no P addition） treatment， whereas the Phosphorus Reabsorption Efficiency （PRE） was the highest under the P₂ addition level. （4） A generally positive correlation was observed between leaf NRE and stoichiometric ratios， while PRE exhibited a generally negative correlation with stoichiometric ratios in mature leaves and a generally positive correlation with stoichiometric ratios in litter leaves. This study suggests that the appropriate P addition amount is P₂-P₃ （45~60 kg·hm^-2）. This research provides practical guidance for precision fertilization and scientific management of artificial grasslands in alpine regions.

Poa pratensis var.Qinghai  /  Phosphorus addition  /  Phenological stages  /  Ecological stoichiometry  /  Nutrient reabsorption efficiency