【摘要】 以蔷薇科委陵菜属的蕨麻（Potentilla anserina L．）为试材，采用盆栽称重法构建梯度水分胁迫体系（土壤含水率10%～50%），研究了旱涝胁迫对苗期蕨麻生理生态特征的影响，以期为高寒沼泽湿地植被恢复与抗逆栽培提供参考依据。结果表明：轻中度干旱（20%～30%含水率）能够诱导超氧化物歧化酶（SOD）(287.85 U·g^-1)、过氧化物酶（POD）(162.06U·g^-1)活性升高，缓解膜脂过氧化丙二醛（MDA）含量较重度干旱降低（64.4%）程度，促进复叶发育；水涝条件（土壤含水率50%）显著提升吲哚-3-乙酸（IAA）含量（提升242.1%），驱动茎叶伸长，而重度干旱（土壤含水率10%）则通过积累脱落酸（ABA）(提升30.05μg·g^-1)与脯氨酸（提升177.5%），抑制赤霉素（GA₃）活性（降低71.3%），减少水分消耗；随时间推移，胁迫响应机制呈现动态转换，前期以抗氧化酶系统为主，中期激素调控作用增强，后期渗透调节物质积累成为关键响应策略。更多还原

【Abstract】 Potentilla anserina L.（Rosaceae）was used as the test material to investigate the effects of drought and waterlogging stress on the physio-ecological characteristics of its seedlings.A gradient water stress system（10%-50%soil water content）was established using the pot weighing method,in order to provide a reference for vegetation restoration and stress-resistant cultivation in alpine swamp wetlands.The results showed that mild to moderate drought（20%-30% soil water content）induced increases in superoxide dismutase(SOD,287.85U·g^-1)and peroxidase(POD,162.06U·g^-1)activities,alleviated membrane lipid peroxidation（malondialdehyde（MDA）content was 64.4%lower than under severe drought）,and promoted compound leaf development.Under waterlogging conditions（50% soil water content）,indole-3-acetic acid（IAA）content increased significantly（by 242.1%）,driving stem and leaf elongation,while severe drought（10% soil water content）led to the accumulation of abscisic acid(ABA,increased by 30.05μg·g^-1)and proline（increased by 177.5%）,inhibited gibberellin（GA3）activity（reduced by 71.3%）,and thereby reduced water consumption.Over time,the stress response mechanisms showed dynamic shifts,the early stage was dominated by the antioxidant enzyme system,the middle stage saw enhanced hormonal regulation,and the late stage was characterized by the accumulation of osmotic adjustment substances as the key response strategy.更多还原