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OALib Journal期刊
ISSN: 2333-9721
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种植密度对不同株型玉米生长及根系形态特征的影响
DOI: 10.3724/SP.J.1145.2012.01009, PP. 1009-1013
Keywords: 根系竞争,根系吸收,紧凑型玉米,平展型玉米,比根长,种植密度
Abstract:
选取平展型（nd108）、紧凑型（zd958）、小株小穗型（cf008）玉米品种，采用pvc管土柱法种植，密度为1株/盆、2株/盆和3株/盆，探讨种植密度对不同株型玉米的生长特性及根系形态的影响.结果表明：种植密度增加，不同株型玉米个体生长均受到抑制，各项根系形态指标显著降低（p<0.01），但较低幅度增密对平展型品种（nd108）根系各项形态指标无显著影响；种植密度对不同株型玉米品种比根长（srl）与比根表面积（srs）的影响程度有显著差异，对平展型品种（nd108）影响最大，对紧凑型品种（zd958）影响最小；穗根比、根系生物量分配比例存在显著基因型差异，平展型品种（nd108）较其它两个品种具有较高的根系干物重分配比例，但其穗根比较低.综上，增密过程中平展型品种（nd108）倾向于通过形成庞大根系以提升单株竞争能力，但是个体间激烈的竞争将限制群体产量的提高；而紧凑型品种（zd958）和小株小穗型品种（cf008）个体间竞争较弱，因而在群体压力增大时能够通过增强自身根系的吸收能力以保证对地上部水分、养分供应，有可能获得更高的群体产量.表3参20
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