指数施肥对美国山核桃幼苗根系形态的影响  

Effects of Exponential Fertilization on Root Morphology of Pecan Seedlings

作　　者：王益明 万福绪[1] 胡菲 李瑞瑞 Wang Yiming;Wan Fuxu;Hu Fei;Li Ruirui(Nanjing Forestry University,Nanjing 210037,P.R.China)

机构地区：[1]南京林业大学,南京210037

出　　处：《东北林业大学学报》2018年第3期29-32,共4页Journal of Northeast Forestry University

基　　金：江苏省林业三新工程项目(LYSX[2015]20);江苏省高校优势学科建设工程项目(PAPD)

摘　　要：为探究施肥对美国山核桃幼苗根系形态的影响和适宜施氮量,以1年生美国山核桃实生苗为试验材料,运用指数施肥法,探讨不同施氮量对美国山核桃根系形态(根长、根表面积、根体积、根生物量和比根长)的影响。结果表明:(1)美国山核桃根系形态指标随着施氮量的增加呈现递减趋势,N100处理的所有指标取得最大值;N100处理的总根长、根表面积、根体积、根生物量分别达到(4 882±356)cm、(830±66)cm2、(12.29±0.19)cm3、(3.84±0.11)g,分别为对照组的1.53、1.55、1.79、1.59倍。(2)美国山核桃幼苗比根长随着施氮量的增加而减小。(3)最有利于美国山核桃幼苗根系生长的施氮量为100~200 mg·株-1。An exponential fertilization trail was conducted to assess the effects on different nitrogen levels on the root morphology(root length,root surface area an,root volume and root biomass)of pecan seedlings.The results show:(1)The root length,root surface area,root volume and root biomass of pecan seedlings were decreased with the increase of N supply.Effect of N total 100mg for a plant was best to pecan seedlings,by the end of the study,the root length,root surface area,root volume and root biomass of pecan seedlings were(4882±356)cm,(830±66)cm2,(12.29±0.19)cm3,(3.84±0.11)g,which were 1.53,1.55,1.79,and 1.59 times of the CK treatment,respectively.(2)The specific root length of the pecan seedlings was decreased with the increase of the amount of nitrogen.(3)The fertilization rate of 100-200mg for a plant was best to the growth of root morphology of pecan seedling.

关 键 词：根系形态 美国山核桃 指数施肥 氮素 

分 类 号：S792[农业科学—林木遗传育种] S664.1[农业科学—林学]