不同种植密度条件下春玉米根系与地上部的相关性  

Correlationship between Characters of Roots and Aerial Parts of Spring Maize under Different Planting Densities

作　　者：张庆玲[1,2] 郭军玲[2] 郭彩霞[2] 杨治平[2] 张强[2] 王永亮[2] 

机构地区：[1]山西大学生物工程学院,山西太原030006 [2]山西省农业科学院农业环境与资源研究所,山西太原030006

出　　处：《山西农业科学》2014年第5期448-451,共4页Journal of Shanxi Agricultural Sciences

基　　金：国家公益性行业(农业)科研专项经费项目(201103003);国家星火计划项目(2012GA630001);山西省农业科学院科技攻关项目(2012ygg07)

摘　　要：密植条件下玉米地上部及根系生长均会受到抑制.以先玉335为供试品种,以面积为取样单位,采用根钻法,对4.5万（低密）、7.5万（中密）、9.0万（高密）株/hm2种植密度下吐丝期春玉米在0～50 cm土体条件下根系主要指标与地上部相关性状（叶面积、籽粒质量及产量等）相结合进行分析.结果表明,中密处理产量最高,单位质量籽粒所具有的根系指标中密处理最低,根冠比中密处理最低;单位叶面积所具有的根系指标随密度增大而减小,单位质量籽粒所具有的根系指标则为低密＞高密＞中密,根冠比为高密＞低密＞中密.综合结果表明,根系具有巨大的吸收潜力.Both shoot and root growth of maize plant are restricted under high planting density.The relationship between the shoot and root growth was studied through a field experiment with Xianyu 335 in Lyuliang city,Shanxi Province in 2013.The relationship between the main root morphological indexs and shoot characters in the 0-50 cm depth of soil profile in the silking period were measured in roots drill excavate experiments under the densities of 45 000,75 000 and 90 000 plants/ha.The results showed that the plants under midial planting densities had the highest yield,the lowest root index of specific weight grain and the lowest root/shoot dry weight ratio.The root index of specific leaf area decreased with the increasing of the planting density.Root index of specific weight grain was in an order of low density ＞ high density ＞ medial density,root/shoot dry weight ratio was high density ＞ low density ＞ medial density.It is concluded that the root system harbors great absorbing ability.

关 键 词：春玉米 种植密度 根系性状 地上部性状 相关性 

分 类 号：S513[农业科学—作物学]