水稻叶片SPAD空间分布与氮素营养及种植密度的关系

SPAD Spatial Distribution of Rice Leaf and Its Relationship with Nitrogen Nutrition and Planting Density

通过大田试验,研究在4个施氮水平和3个种植密度下,水稻孕穗和抽穗两个时期水稻不同叶位叶片SPAD值的空间分布特征,并对叶片氮素营养和种植密度与不同叶位的SPAD值之间的相关性进行分析。结果表明,随着施氮量的增加,孕穗期SPAD值表现为顶3叶>顶2叶>顶4叶>顶1叶;抽穗期SPAD值表现为顶1叶>顶2叶>顶3叶>顶4叶。不同种植密度对水稻各叶位的SPAD值差异不显著。相关分析发现,孕穗期不同叶位SPAD值与施氮量的相关性顺序是顶4叶>顶3叶>顶2叶;抽穗期不同叶位SPAD值与施氮量的相关性顺序是顶1叶>顶3叶>顶2叶>顶4叶。

Field experiments were conducted to investigate the spatial distribution of SPAD value of rice leaf at different positions at booting stage and heading stage under the conditions of four nitrogen application rates and three planting densities, and their relationships were also analyzed. The results indicated that the SPAD value of rice leaf at different positions increased with the increase in nitrogen application rate. At booting stage, the order of SPAD value of rice leaf at different positions was the third leaf 〉 the second leaf 〉 the fourth leaf 〉 the first leaf from the top. At heading stage, the SPAD value of rice leaf at different positions had the following sequence ： the first leaf 〉 the second leaf 〉 the third leaf 〉 the fourth leaf from the top. Planting density had no signifi- cant influence on the SPAD value of rice leaf at different positions. Correlation analysis found that there was a significant linear correlation between the SPAD value of rice leaf at different positions and nitrogen application rate at booting stage and heading stage.