施肥对华山松容器苗根系形态及针叶生理特性的调控作用  

Regulatory effects of fertilization on root morphology and needle physiological characteristics of Pinus armandii Franch.container seedlings

作　　者：丰伟 陈诗[2] 单昌丹 张慧 姚增玉[1] Feng Wei;Chen Shi;Shan Chang-Dan;Zhang Hui;Yao Zeng-Yu(Key Laboratory of Forest Resources Conservation and Utilization in the Southwest Mountains of China,Southwest Forestry University,Kunming 650224,China;Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学西南山地森林资源保育与利用教育部重点实验室,昆明650224 [2]西南林业大学西南地区生物多样性保育国家林业与草原局重点实验室,昆明650224

出　　处：《植物科学学报》2023年第4期521-530,共10页Plant Science Journal

基　　金：云南省农业基础研究联合专项(2018FG001-008)。

摘　　要：以华山松(Pinus armandii Franch.)容器苗为材料,设置常规施肥和指数施肥两种施肥方式,每种施肥方式每株共施含氮(N)量为100、200、300和400 mg的复合肥,以不施肥处理为对照,分析施肥对苗木生长、根系形态和针叶生理的影响。结果显示:常规和指数施肥方式下,随施肥量的增加,苗高、地径、生物量、根长、根表面积和根体积等均先增后降,根组织密度、可溶性糖和丙二醛含量则先降后升;比根长和比表面积随施肥量增加而降低;根平均直径、脯氨酸和可溶性蛋白含量则随施肥量增加而增加;相同施肥量下,以上指标基本以指数施肥的较高;指数施肥每株施N 300 mg(E300处理)的隶属函数综合得分最高。研究结果表明,合理施肥可促进根系发育、改善苗木生理水平,进而提高苗木质量,合理施肥处理为E300。This study explored the growth,root morphology,and physiological characteristics of Pinus armandii Franch.container seedlings under different fertilization treatments to reveal the regulatory effects of fertilization on seedling quality.The P.armandii container seedlings were grown under four fertilizer rates(100,200,300,and 400 mg N/seedling)with either conventional or exponential fertilization,with no fertilization serving as a control.The effects of fertilization on growth,root morphology,and physiological characteristics were then analyzed.Results showed that under both conventional and exponential fertilization,seedling height,root collar diameter,biomass,root length,root surface area,and root volume all initially increased and then decreased,while root tissue density and soluble sugar and malondialdehyde contents initially decreased and then increased with the increase in fertilizer application rates.Furthermore,as fertilizer application increased,specific root length and specific surface area decreased while root average diameter and free pro-line and soluble protein contents increased.Most indices were higher under exponential fertilization than con-ventional fertilization at the same fertilizer rate.The E300 treatment(exponential fertilization at 300 mg N per plant)yielded the highest comprehensive score.In conclusion,rational fertilization promoted seedling growth and root development and improved the physiology of P.armandii container seedlings,with the optimal ferti-lization treatment being exponential fertlization at 300 mg N per plant.

关 键 词：华山松 指数施肥 苗木生长 根系形态 生理特性 

分 类 号：S723.1[农业科学—林木遗传育种]