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通过小区棉花密度和水分对比试验,分析不同密度和水分处理的棉花整个生育期生物量和LAI(叶面积指数)与高光谱特征参数的相关性,建立棉花生物量和LAI光谱估算模型。选取的所有植被指数与棉花LAI和生物量相关性均达到极显著水平,其中光谱参量NDVI(890,670)与LAI的相关性和光谱参量Height(920)与生物量相关性最好,用这2个参量与生物量建立棉花长势估测模型,其决定系数分别为0.804 0和0.760 9,均方根误差分别为0.191 5和0.315 2,利用光谱特征参数可以有效地监测棉花整个生育期的长势变化。
The cotton biomass and LAI spectral estimation models of cotton biomass and LAI (leaf area index) and hyperspectral parameters were analyzed through plot cotton density and water contrast test. The correlations between LAI and biomass of all selected vegetation indices reached significant level. The correlation between spectral parameters NDVI (890, 670) and LAI and the spectral parameter Height (920) were the best correlated with biomass, Parameters and biomass were used to establish the cotton growth estimation model. The coefficients of determination were 0.804 0 and 0.760 9 respectively, and the root mean square errors were 0.191 5 and 0.315 2, respectively. The spectral parameters could effectively monitor the growth of cotton during the whole growth period.