烤烟冠层光谱参数与地上生物量的相关性研究

Study on Correlation of Aboveground Biomass with Canopy Reflectance Spectrum Parameters of Flue-cured Tobacco(Nicotiana sanderae)

[目的]明确烤烟(Nicotiana sanderae)地上生物量与冠层光谱参数的相关性。[方法]大田条件下设置5个氮肥施用梯度,利用相关分析对地上鲜生物量和冠层光谱参数的相关性进行分析。[结果]一定范围内,施氮量增加,对团棵期和旺长期的烤烟地上鲜生物量表现出较明显的促进效应。与地上鲜生物量相关性最强的单波段反射率波长均为550 nm,R=-0.949 0;相关性最强的植被指数为RVI(1 050,550),R=0.983 1。[结论]该研究可为开发基于冠层光谱的烤烟长势监测仪器提供研究基础和数据支撑。

[Objective] The aim was to confirm the correlation of aboveground biomass with canopy reflectance spectrum parameters of flue-cured tobacco.[Method] Five nitrogen fertilizer amount was applied in field,the correlation between aboveground biomass and canopy reflectance parameters was analyzed.[Method] The results showed that to the specified extent,the increase of nitrogen fertilizer application amount showed significant promotion effect on aboveground biomass in spherical plant stage and fast growing stage.The single band reflectivity wavelength with the highest correlation with aboveground biomass was 550 nm,R=-0.949 0,while the vegetation index with the highest correlation with aboveground biomass was RVI（1 050,550）,R=0.983 1.[Conclusion] The study provides a research basement and data support for development of growth vigor monitoring instrument.