干旱地区农业研究Issue(2)：81-86,6.DOI:10.16302/j.cnki.1000-7601.2015.02.013
干旱区玉米抽雄期叶绿素含量高光谱最佳模型选择
Selection of optimal model using hyperspectral parameters for chlorophyll content of maize during tasseling stage in arid region
摘要
Abstract
A model monitoring the quantitative content of chlorophyll was established using correlation and linear and nonlinear analyses to determine the relationships between chlorophyll content of maize at the heading stage and a vari -ety of high spectral parameters .The results showed that the raw spectral reflectance had a maximal negative correlation coefficient at 713 nm(r = 0 .86) with the chlorophyll content .The first derivative spectral reflectance had a maximal pos-itive correlation coefficient at 760 nm ( r = 0 .84) .The parameters included λr , λb , λy , λg , Rg , SDr , SDr/SDb , SDr/SDy ,(Rg - Ro )/(Rg + Ro ) and (SDr - SDb)/(SDr + SDb) ,all of which reached significant correlations with the chlorophyll content .Models were built based on 12 kinds of spectral parameters that showed significant correlations . The R2 is of the models were greater than 0 .72 ,constructed by the raw spectral reflectance ,green reflection peak ,the spectral reflectance of the first derivative ,vegetation index and normalized difference vegetation index based on the red edge and blue edge area ratio .The first two exponential models established were better than the linear model ,whereas the latter three linear models were better than the exponential models .Through precision evaluations of the estimation models ,the model yChlorophyl content = 6912x760nm + 44 .878 constructed in the first derivative spectral reflectance at 760 nm .This model seemed to be the best prediction for the chlorophyll content of maize at the heading stage due to its maxi -mal correlation coefficient and minimal RMSE ,and its relatively simple expression .The correlation coefficient R2 of the model was increased at least 11 .4% more than other models .关键词
叶绿素含量/高光谱参数/抽雄期Key words
chlorophyll content/spectral parameter/maize tasselling分类
农业科技引用本文复制引用
武倩雯,熊黑钢,王凯龙,王莉峰,靳彦华..干旱区玉米抽雄期叶绿素含量高光谱最佳模型选择[J].干旱地区农业研究,2015,(2):81-86,6.基金项目
国家自然科学基金（41171165）；北京市属高等学校高层次人才引进与培养计划项目（IDHT20130322）；北京联合大学人才强校计划资助项目 （）
