不同水氮处理对玉米氮素诊断指标的影响(英文)

被引：13

作者：

朱娟娟 ^{[1
]}

梁银丽 ^{[1
,2
]}

TREMBLAY Nicolas ^{[3
]}

机构：

[1] 西北农林科技大学生命科学学院

[2] 中国科学院水利部水土保持研究所

[3] 加拿大农业与农业食品部园艺研究与发展中心

来源：

作物学报 | 2011年 / 37卷 / 07期

关键词：

诊断指标; 氮素; 干旱; 复水;

D O I：

暂无

中图分类号：

S513 [玉米（玉蜀黍）];

学科分类号：

0901 ;

摘要：

SPAD-502叶绿素仪与Dualex-3多酚仪均可诊断作物的氮素营养状况,为了探讨不同水分条件下该指标对作物施氮量的响应,以玉米品种Pioneer 38B84为研究对象,在温室盆栽条件下,研究3个土壤水分水平(干旱、干旱后复水和水分良好)和4个施氮水平(0、50、50+75和200kghm-2),即12个处理对植物含氮量、SPAD值、Dualex值以及SPAD/Dualex比值的影响。结果表明,植物含氮量、SPAD值和SPAD/Dualex比值均随施氮量的增加而增加,Dualex值随施氮量的增加而减少。干旱胁迫初期,植物含氮量、SPAD值和SPAD/Dualex比值迅速下降,Dualex值迅速增加;随着干旱胁迫时间的推进,各指标逐渐呈相反趋势变化。干旱复水后,植物含氮量、Dualex值和SPAD/Dualex比值逐渐恢复,然而SPAD值恢复较小。SPAD值(r=0.92)、Dualex值(r=-0.86)及SPAD/Dualex值(r=0.63)与植物含氮量呈极显著的相关性,但试验后期,由于生长阶段的不同,SPAD值和Dualex值与植物含氮量在干旱条件下(SPAD:r=0.90;Dualex:r=-0.83)的相关性高于在水分良好条件下(SPAD:r=0.39;Dualex:r=-0.44)。通过比较不同水分条件下,SPAD值、Dualex值和SPAD/Dualex值对不同施氮量的响应,发现Dualex值在不同水分条件下均能较好地反应施氮水平。

引用

页码：1259 / 1265

页数：7

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