平茬对四翅滨藜补偿生长及水分生理特征的影响  

Compensatory growth and water physiological characteristics of Atriplex canescens under stubble treatment

作　　者：马帅 周海 种培芳[1] 任珩 冯相艳 MA Shuai;ZHOU Hai;CHONG Peifang;REN Heng;FENG Xiangyan(College of Forestry,Gansu Agricultural University,Lanzhou 730070,China;Northwest Institute of Eco-Ecoenvironment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]甘肃农业大学林学院,兰州730070 [2]中国科学院西北生态环境资源研究院,兰州730000

出　　处：《西北植物学报》2024年第3期353-361,共9页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(32171876);内蒙古自治区科技计划项目(2021GG0053);甘肃省优秀博士项目(23JRRA627)。

摘　　要：【目的】四翅滨藜是荒漠化防治区广泛引种的优质旱生灌木,平茬是其主要抚育管理措施,揭示其平茬后恢复过程中的适应性和补偿生长机制,可为四翅滨藜发展成荒漠区优质饲料提供理论支撑。【方法】以人工种植的5年生四翅滨藜植株为研究对象,在平茬处理(留茬高度10cm)后,测定四翅滨藜恢复过程中的株高、冠幅、光合反应、叶片水势、叶片导水率和水分利用效率,并探讨功能性状间的关系。【结果】(1)四翅滨藜平茬后的株高、冠幅和地上生物量经过1个生长季后能恢复至平茬前状态;(2)平茬植株的叶水势、叶导水率、水分利用效率、光合参数均高于对照植株;(3)线性拟合分析显示,平茬植株的正午叶水势和气孔导度与生长速率呈显著正相关。【结论】四翅滨藜平茬后具有良好的补偿生长能力;平茬植株在恢复生长前期表现出较高的补偿生长能力和典型的获取性策略,后期随着水力状况降低又转向保守性策略;平茬植株会将更多的生物量和资源分配到枝、叶等地上组织的生长,后期的资源分配又转向促进地下部分生长。[Objective]Atriplex canescens is a high-quality xerophytic shrub widely introduced in desertification control areas,and stubble is a main management measure for desertification control.Revealing the adaptability and compensatory growth mechanism in the recovery process after stubble can provide theoretical support for developing A.canescens into a high-quality feed in desert areas.[Methods]In this study,5-year-old A.canescens plants were used as object.Through stubble treatment,plant height,crown width,photosynthetic reaction,leaf water potential,leaf hydraulic conductivity,and water use efficiency were measured during the recovery process of A.canescens,and the relationship between functional traits was discussed.[Results](1)The plant height,crown width,and aboveground biomass of A.canescens after stubble were recovered to the pre-stubble state after a growing season.(2)The leaf water potential,leaf hydraulic conductivity,water use efficiency,and photosynthetic parameters of the stubble plants were higher than those of the control plants.(3)Linear fitting analysis showed that the midday leaf water po-tential and stomatal conductance of the stubble plants were significantly positively correlated with the growth rate.[Conclusion]A.canescens had good compensatory growth ability after stubble.In the early stage of recovery growth,the flat stubble plants showed higher compensatory growth ability and typical acquisition strategy,and then turned to conservative strategy with the decrease of hydraulic condition in the later stage.Stubble plants allocated more biomass and resource to the growth of aboveground parts such as branches and leaves,and the later resource allocation turned to the growth of underground parts.

关 键 词：四翅滨藜 平茬 补偿生长 水分生理 生态适应 

分 类 号：Q945[生物学—植物学] S753.51[农业科学—森林经理学]