限域供应NO_3^-对玉米根系形态及其吸收的影响  

Effect of localized supply of nitrate on corn root morphology and NO_3^- uptake

作　　者：何华[1] 康绍忠[2] 曹红霞[2] 

机构地区：[1]中国科学院水利部西北农林科技大学水土保持研究所 [2]西北农林科技大学水利与建筑工程学院,陕西杨陵712100

出　　处：《西北农林科技大学学报（自然科学版）》2002年第1期5-8,共4页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家杰出青年科学基金项目 ( 4 972 5 10 2 );西北农林科技大学科研专项基金项目

摘　　要：用 PVC管进行土柱栽培试验 ,研究了限域供应 NO- 3 对玉米根重、根系密度大小和分布的影响及玉米根系形态对 NO- 3 吸收的影响 ,并讨论了限域供应 NO- 3 与侧根萌发、伸长的关系。结果表明 ,土表下灌施 NO- 3能促进根系在土壤中下层的分布 ,显著增加根系密度及其在土壤中层的分布 ;根系密度与 NO- 3 吸收量关系密切 ,相关系数 (R2 )为 0 .95 0 6。限域供应 NO- 3 能够刺激侧根萌发伸长和增加根系密度。In this paper,experimental results of the influence of localized supply of nitrate on corn root weight,root length density (RLD) and their distribution,and the relation of root morphology and NO - 3 uptake are presented.The relation of localized supply of nitrate and the sprouting and elongation of lateral roots is discussed also.The results show,the localized supply of nitrate at 20,30,40 cm respectively has strengthened the distribution of roots in deeper soil,and greatly raised RLD and its distribution in subsiol.RLD was related to NO - 3 uptake closely and R 2=0.950 3.Localized supply of nitrate stimulated lateral root growth,RLD increased quickly,and caused NO - 3 to be absorbed sufficiently.

关 键 词：限域供应 玉米 根系形态 吸收 硝酸根 土壤养分 

分 类 号：S513.062[农业科学—作物学] S143.1