中国土壤与肥料Issue(1)：149-158,10.DOI:10.11838/sfsc.1673-6257.25234
不同供钾水平对玉露香梨幼苗光合特性和氮素吸收的影响
Effects of potassium supply levels on photosynthetic characteristics and nitrogen uptake in'Yuluxiang'pear
摘要
Abstract
Potassium plays a crucial role in plant growth and nitrogen metabolism.Studying the effects of different potassium levels on the growth and nitrogen absorption/utilization of'Yuluxiang'pear seedlings can provide a theoretical basis for scientific potassium fertilization in'Yuluxiang'pear production.A sand culture experiment was conducted using one-year-old'Yuluxiang'pear seedlings to investigate the effects of different potassium supply levels(0,3,6,9,and 12 mmol/L,denoted as K0,K1,K2,K3,and K4,respectively)on seedling growth,photosynthetic characteristics,and nitrogen absorption and utilization.The results showed that the K2 treatment significantly increased the belowground biomass,root length,total root surface area,and root activity of'Yuluxiang'pear seedlings compared with other treatments.The net photosynthetic rate,transpiration rate,stomatal conductance,and chlorophyll fluorescence parameters of leaves initially increased and then decreased with rising potassium concentrations,peaking under the K2 treatment.In contrast,intercellular CO2 concentration showed an opposite trend,reaching its lowest value at K2 treatment.The nitrogen mobilization capacity of roots,branches and stems,and leaves under K2 treatment was 1.65,1.27,and 1.38 times that of K0 treatment,respectively;the 15N uptake and 15N utilization rate were 1.83 and 2.19 times those of K0 treatment,respectively.In summary,both potassium deficiency and excess could inhibit root growth and photosynthesis,reduce biomass accumulation,and impair nitrogen uptake and utilization.Optimal potassium supply(6 mmol/L level)promoted seedling root development while enhancing nitrogen translocation from roots to shoots,thereby achieving high-efficiency nitrogen assimilation and ultimately improving the growth of'Yuluxiang'pear seedlings.关键词
玉露香梨/钾水平/氮素/吸收利用/光合特性Key words
'Yuluxiang'pear/potassium levels/nitrogen/absorption and utilization/photosynthetic properties引用本文复制引用
黄洋洋,古静娴,冯悦晨,滑小赞,王森,赵瑞芬,高翔..不同供钾水平对玉露香梨幼苗光合特性和氮素吸收的影响[J].中国土壤与肥料,2026,(1):149-158,10.基金项目
山西省现代农业产业技术体系建设专项资金(2024CYJSTX07). （2024CYJSTX07）
