高温胁迫下水稻产量的高光谱估测研究

为了定量分析不同生育期冠层反射光谱参数与水稻产量及产量构成要素的相互关系,确定能够准确预测高温胁迫下水稻籽粒产量的敏感光谱参数,通过盆栽试验,测定了孕穗期4种温度胁迫处理后的2个水稻品种不同生育期冠层高光谱反射率以及成熟后的理论产量、实际产量、穗数、每穗粒数、千粒重、穗长、穗干质量和结实率。结果表明,相对于蜡熟期的光谱参数,抽穗期和灌浆期的光谱参数与理论产量、实际产量、穗数、每穗粒数、千粒重、穗长、穗干质量以及结实率的相关性都较高,均达到显著水平。此两个时期可以作为预测水稻产量的关键时期。其中,差值植被指数DVI810,A(450,560,680)]、垂直植被指数PVI(810,680)、红边幅值Dλred和红边峰值面积可以同时预测成熟水稻的理论产量和实际产量。而差值植被指数DVI(810,450)和DVI(810,560)、垂直植被指数PVI(810,680)和Dλred可以同时预测成熟水稻的穗数、每穗粒数和千粒重。相对于灌浆期的模型,抽穗期的模型能较可靠地监测水稻产量。

Estimation of Rice Yield under High Temperature Stress by Hyper-spectral Remote Sensing

To determine the relationships between the canopy spectral reflectance indices during different growth stages and grain yield and its components of rice,and to seek the sensitive spectral parameters for exactly estimating rice grain yield under high temperature stress,a pot experiment was conducted with two rice cultivars under four high-temperature stresses at the booting stage.The canopy hyper-spectral reflectance at different growth stages after heading,theoretical yield,actual yield,grain number per pan...