水氮添加对文冠果幼苗C、N、P和K分配模式及化学计量特征的影响  

Effects of water and nitrogen additions on the allocation pattern and stoichiometric characteristics of C,N,P,and K in Xanthoceras sorbifolia seedlings

作　　者：淑敏 青云 敖敦格日乐[1] 红艳[1,2] 辛颖 拉喜那木吉拉[1] SHU Min;QING Yun;Aodungerile;HONG Yan;XIN Ying;Laxinamujila(Mongolian Medicine College,Inner Mongonlia Minzu University,Tongliao,Inner Mongolia 028000,China;National and Local Joint Engineering Research Center for Mongolian Medicine Research and Development,Tongliao,Inner Mongolia 028000,China)

机构地区：[1]内蒙古民族大学蒙医药学院,内蒙古通辽028000 [2]蒙药研发国家地方联合工程研究中心,内蒙古通辽028000

出　　处：《西北植物学报》2024年第11期1769-1779,共11页Acta Botanica Boreali-Occidentalia Sinica

基　　金：内蒙古自治区自然科学基金项目(2021LHMS08031);内蒙古自治区直属高校基本科研项目(GXKY23Z014);蒙药研发国家地方联合工程研究中心开放基金项目(MDK2021031);内蒙古自治区科技项目(2021GG0002);内蒙古民族大学博士启动基金项目(BS602)。

摘　　要：【目的】研究文冠果幼苗C、N、P和K分配规律对水分和氮添加的响应,为探讨水氮环境适应策略和培育高质量苗木提供参考。【方法】采用2因素(氮和水)随机区组设计,设置4个氮添加水平[0(N_(0)),5(N_(1)),10(N_(2)),15(N_(3))g/m^(2)]以及3个水分条件[适宜水(W_(CK))、干旱(W_(d))和充分水(W_(w))],分析2种因素组合处理下文冠果幼苗叶、枝、根生态化学计量特征。【结果】(1)氮和水分独立或交互影响幼苗C、N、P、K含量,而化学计量比主要受氮添加影响。在W_(CK)条件下,氮添加均增加C、N、P含量;在Wd条件下,N_(3)添加通过增加K含量,降低N、P含量抵御干旱;W_(w)条件下,仅N_(3)添加有效缓解氮限制。(2)C、N、P、K营养元素主要集中在叶片,支持光合和生长;N、P含量在叶片变异性高,但N/P稳定性强。(3)相同元素在不同器官间相关性较高,叶和根之间的养分协同性高于枝,可维持植物稳定生长。【结论】氮添加可缓解氮匮乏,但可提高P、K需求;建议适宜水分条件下减少氮肥施用,以减少污染并维持植物生长潜力。[Objective]The study aims to investigate the response of C,N,P,and K distribution to water and nitrogen addition in Xanthoceras sorbifolia seedlings in order to provide references for water-nitrogen environmental adaptation strategies and high-quality seedling cultivation.[Methods]A two-factor(nitro-gen and water)randomized block design was adopted in this study.Four N fertilization levels[N_(0):0 g/m^(2),N_(1):5 g/m^(2),N_(2):10 g/m^(2),and N_(3):15 g/m^(2)]and three levels of water addition[well watered(WCK),drought(Wd),and fully watered(Ww)]were set up to explore the impact on the ecological stoichiometric charac-teristics of X.sorbifolia leaves,branches,and roots.[Results](1)The C,N,P,and K levels of seed-lings were independently or interactively influenced by nitrogen and water,while the stoichiometric ratios were mainly affected by nitrogen addition.Under well-watered conditions(W_(CK)),nitrogen addition in-creased C,N,and P levels.Under drought conditions(W_(d)),high nitrogen addition(N_(3))could resist drought by increasing K level and decreasing N and P levels.Under well-watered conditions(W_(w)),only high nitrogen addition(N_(3))effectively alleviated nitrogen limitation.(2)C,N,P,and K nutrients were mainly concentrated in leaves,supporting photosynthesis and vegetative growth.The variability of N and P contents in leaves was high,but the N/P ratio remained stable.(3)The same element exhibited a high correlation among different organs,particularly between leaves and roots,maintaining stable growth.[Conclusion]Nitrogen addition alleviates nitrogen deprivation but increases the demand for P and K.It is recommended to reduce nitrogen fertilizer application under suitable water condition to reduce pollution and maintain growth potential.

关 键 词：文冠果幼苗 氮素和水分 不同器官 养分分配 化学计量特征 

分 类 号：S794.9[农业科学—林木遗传育种] S718.43[农业科学—林学]