复幼处理对小黑杨叶片营养成分及光合特性的影响

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关键词：小黑杨；复幼处理；埋干；埋根；扦插；营养成分；光响应曲线，光响应参数 中图分类号： Q945.48 ： 5722.8+9 文献标识码：A DOI：10.7525/j.issn.1006-8023.2025.06.00

Effects of Rejuvenation Treatment on Nutritional Composition and Photosynthetic Characteristics of Populus simonii×P. nigra Leaves

YEZhouchen1，YANGShun1，YUTianhua1，YANGJianan1，SISi 2 ， JI Xiaohui 2* ，SHI Shaolin1* （1.CollgeofLifeScienceandAgroforestry，QiqiharUniversity，Qiqihar16106，China;2.QiqiharBranchofHeilongjangAcad emy of Forestry，Qiqihar 161005，China）

Abstract：Exploringthe efectsof different rejuvenating treatment measures onthe nutritional composition，secondary metabolitesand photosyntheticcharacteristicsofPopulus simonixP.nigraleaves，and providingatheoretical basis for the establishment of the rejuvenating system of P .simonit ×P .nigra in forestry practice in the future.The 4O-year-old superior clones of P .simoniix P .nigra were rejuvenated and cut into seedlings （the mother tree cutting seedlings were usedasthecontrolgroup）bytwomethodsofburied stemsandburiedroots.The diferences inwatercontent，totalflavonoid content，and light saturation point among the three cuting seedlings were measured and analyzed.The results showedthattherejuvenating treatmentcould significantlyincrease thewatercontentand nutrientelement mass fraction of P .simonii×P. nigra leaves. Among them，the relative water content（81. 60% ）and total potassium mass fraction （204号 （2.332% ）of the leaves of the buried stem cutting seedlings were the highest.The contents of secondary metabolites such as total phenolics （1.633% ）and total flavonoids （ 6.214% ） in the leaves of buried root cutting seedlings were significantly higher than those in the other two leaves. The light saturation point （ 1585.093，1730.273μmol/（m2⋅s） ） and Co 2 saturation point （1132.690，1123.560μmol/mol， ）of the leaves of the buried root and stem cutting seedlings were higher than those of the mother tree，which improved the photosynthetic capacity of P . simoniixP. nigra to a certainextent.Itcanbe seenthatrejuvenating treatment willhaveapositive impactonthenutritionalcompositionand photosynthetic characteristicsof P .simonit ×P nigra leaves.

KeyWords：Populus simoniiXP.nigra;rejuvenation treatment；buried stem；buried root；cutings；nutritional composi-tion；light response curve，light response parameters

0 引言

农田防护林作为生态建设的重要组成部分，具有降低风速、防止土壤风蚀、保护农田生态系统的功能，同时对调节周围大气、植物和土壤环境，以及维护农田小气候平衡等有显著效果，是农田生态系统的屏障。（剩余17418字）