中国草地学报2025，Vol.47Issue(5)：1-11,11.DOI:10.16742/j.zgcdxb.20240278
硅对磷限制下紫花苜蓿生理生态及氮磷化学计量的影响
Effects of Silicon on Physiological Ecology and Nitrogen,Phosphorus Stoichiometry in Alfalfa under Phosphorus Limitation
摘要
Abstract
While the beneficial effects of silicon addition on Poaceae species have been widely reported,its mitigating effects and mechanisms of phosphorus deficiency in legumes remain unclear.In this study,a pot experiment was designed to investigate the effects of silicon application on alfalfa(Medicago sativa L.)under phosphorus limitation.Two nutrient conditions(nutrient balance and phosphorus limitation)and three concentrations of potassium silicate(0,1,and 2 mmol/L)were applied to determine the effects of silicon addition on the growth characteristics,photosynthetic parameters,and nitrogen and phosphorus stoi-chiometric traits of the alfalfa under phosphorus limitation.The results showed that alfalfa biomass,plant height,photosynthetic rate,stomatal conductance,transpiration rate,photosynthetic water use efficiency,and shoot phosphorus content were significantly reduced by phosphorus limitation,whereas the shoot N∶P ratio increased particularly when no silicon was added.Silicon addition significantly increased biomass,plant height,photosynthetic rate,stomatal conductance,transpiration rate,and shoot phosphorus content of alfalfa under phosphorus limitation,while the addition under nutrient-balanced condition reduced stoma-tal conductance without affecting other parameters.Correlation analysis further revealed that under phosphorus-limited conditions,shoot silicon content was positively correlated with shoot phosphorus con-tent and negatively correlated with the N∶P ratio.However,these correlations were not observed under nutrient-balanced conditions.Therefore,phosphorus limitation of alfalfa can be mitigated by silicon addi-tion.Results demonstrated the associated mechanisms driving internal nutrient homeostasis from a stoichio-metric perspective,and provided guidance and theoretical basis for the utilization of silicon in alfalfa cultiva-tion under phosphorus deficiency.关键词
磷限制/紫花苜蓿/硅添加/氮磷比Key words
Phosphorus limitation/Alfalfa/Silicon addition/N∶P ratio分类
农业科技引用本文复制引用
李俊霖,宋婵,钱程,赵欣,胡雅飞,刘大林,王琳,李新娥..硅对磷限制下紫花苜蓿生理生态及氮磷化学计量的影响[J].中国草地学报,2025,47(5):1-11,11.基金项目
2023江苏省研究生实践创新计划项目(SJCX23_1989) （SJCX23_1989）
