利用冠层反射光谱和叶片SPAD值预测小麦籽粒蛋白质和淀粉的积累

 研究了不同土壤水氮条件下小麦抽穗后叶片氮素状况和籽粒蛋白质及淀粉积累动态与叶片SPAD值、冠层光谱反射特征的关系。结果表明,小麦抽穗后叶片氮积累量与叶片SPAD值、冠层反射光谱分别呈显著的指数和线性相关;籽粒蛋白质积累量与叶片氮积累量呈显著线性负相关,而成熟期籽粒蛋白质积累量与抽穗后叶片氮转运量呈线性正相关。叶片SPAD值与籽粒蛋白质和淀粉积累量均呈二次抛物线关系;比值指数R(1 500,610)和R(1 220,560)分别与籽粒蛋白质积累量和淀粉积累量呈显著负指数相关。因此,叶片SPAD值和比值指数可以

Monitoring Protein and Starch Accumulation in Wheat Grains with Leaf SPAD and Canopy Spectral Reflectance

The research was conducted to determine the relationships between post-heading leaf SPAD values, canopy spectral reflectance, and protein and starch accumulation dynamics in grains of wheat. The results showed that leaf nitrogen accumulation was exponentially related to leaf SPAD values and linearly related to canopy spectral reflectance. There was a negative linear relationship between leaf nitrogen accumulation and grain protein accumulation, but positive linear relationship between post-heading leaf nitrogen translocation and grain protein accumulation at maturity. In addition, leaf SPAD values were parabolically related with protein and starch accumulation in grains. Ratio indices R (1 500,610) and R (1 220,560) were exponentially related with protein and starch accumulation in grains, respectively. These results indicate that leaf SPAD values and canopy spectral reflectance are good indicators of quality formation dynamics in wheat grains.