基于高光谱数据的滴灌甜菜叶片全氮含量估算

李宗飞,苏继霞,费聪,李阳阳,刘宁宁,戴宇祥,张开祥,王开勇,樊华,陈兵

Estimation of total nitrogen content in sugarbeet leaves under drip irrigation based on hyperspectral characteristic parameters and vegetation index

Zong-Fei LI,Ji-Xia SU,Cong FEI,Yang-Yang LI,Ning-Ning LIU,Yu-Xiang DAI,Kai-Xiang ZHANG,Kai-Yong WANG,Hua FAN,Bing CHEN

表2 光谱特征参数及敏感波段植被指数与全氮含量相关性

Table 2 Correlation between spectral characteristic parameters and vegetation index in sensitive bands and total nitrogen content

光谱特征参数 Spectral characteristic parameter 相关关系 Correlation 植被指数 Vegetation index 相关性Correlation Dr 0.590** 原始光谱比值植被指数Ratio vegetation index R1104/R767 0.358** λr 0.497** 原始光谱差值植被指数Difference vegetation index R1104-R767 0.280** SDr 0.601** 原始光谱归一化植被指数Normalized ratio vegetation index (R1104-R767)/(R1104+R767) 0.364** Dy 0.074 原始光谱比值植被指数Ratio vegetation index R767/R604 0.652** Λy 0.089 原始光谱差值植被指数Difference vegetation index R767-R604 0.433** SDy -0.086 一阶微分比值植被指数Ratio vegetation index Dr1138/Dr762 -0.169 Db 0.072 一阶微分差值植被指数Difference vegetation index Dr1138-Dr762 -0.744** λb 0.506** 一阶微分归一化植被指Normalized ratio vegetation index (Dr1138-Dr762)/(Dr1138+Dr762) 0.500** SDb -0.216 一阶微分比值植被指数Ratio vegetation index Dr762/Dr496 0.586** R604 -0.267** 一阶微分差值植被指数Difference vegetation index Dr762-Dr496 0.721** R1104 0.680** 红边比值植被指数Red edge ratio vegetation index Dr747/Dr687 0.431** Dr1138 -0.715** 红边差值植被指数Red edge difference vegetation index Dr747-Dr687 0.589** Dr762 0.703** 红边归一化差异指数Red edge normalized difference index (Dr747-Dr687)/( Dr747+Dr687) 0.545**