干旱胁迫对冬小麦光合色素含量影响的高光谱监测  

Hyperspectral Monitoring of Effects of Drought Stress on Photosynthetic Pigment Content of Winter Wheat

作　　者：闫晓斌 王志刚 王亚新 冯美臣[1] 王超[1] 肖璐洁[1] 禹静涛 杨武德[1] YAN Xiaobin;WANG Zhigang;WANG Yaxin;FENG Meichen;WANG Chao;XIAO Lujie;YU Jingtao;YANG Wude(College of Agriculture,Shanxi Agricultural University/Institute of Dryland Agricultural Engineering,Taigu 030801,China)

机构地区：[1]山西农业大学农学院/旱作农业工程研究所,山西太谷030801

出　　处：《山西农业科学》2022年第9期1269-1277,共9页Journal of Shanxi Agricultural Sciences

基　　金：国家自然基金项目(31871571,31371572);山西农业大学科技创新基金项目(2018YJ17,2020BQ32);山西省高等学校科技创新项目(2020L0132);山西省应用基础研究项目(201801D221299);山西省重点研发项目(201903D211002)。

摘　　要：为明确干旱胁迫下冬小麦光合色素含量变化的高光谱响应特性,实现冬小麦光合色素含量的定量监测,以冬小麦长6878为研究对象,利用高光谱技术对干旱胁迫下和复水后冬小麦光合色素含量进行了监测。结果表明,在冬小麦生长前期进行轻度干旱胁迫,生长后期复水后光合色素含量会有显著提升,中度和重度干旱胁迫下光合色素含量则显著降低;随着干旱胁迫程度的增加,生长前期在可见光区域光谱反射率逐渐升高,红边位置逐渐蓝移,生长后期复水后,轻度胁迫处理下的光谱反射率及红边参数较对照没有明显的变化,但中度和重度干旱胁迫下,红边振幅和红边面积大幅减小。在基于原始光谱反射率和一阶微分光谱反射率建立的全波谱的PLS模型和基于特征波段的MLR模型中,最优模型分别为基于R+SPA+MLR建立的叶绿素a含量监测模型(R2 v=0.705,RMSEv=0.556,RPD=1.592)、基于1st+PLS建立的叶绿素b含量监测模型(R2 v=0.696,RMSEv=0.188,RPD=1.856)和基于1st+PLS建立的类胡萝卜素含量监测模型(R2 v=0.493,RMSEv=0.138,RPD=1.261)。To clarify the hyperspectral response characteristics of photosynthetic pigment content changes of winter wheat under drought stress,and realize the quantitative monitoring of photosynthetic pigment content of winter wheat,in this study,winter wheat(Chang 6878)was taken as the research object and the photosynthetic pigment content of winter wheat under drought stress and after rehydration was monitored using hyperspectral technique.The results showed that the photosynthetic pigment content of winter wheat increased significantly when it was subjected to mild drought stress at the early growth stage and rehydrated at the later growth stage,but the content decreased significantly under moderate and severe stress.With the increase of the degree of drought stress,the spectral reflectance in the visible light region increased gradually in the early growth stage,and the position of the red edge shifted to blue gradually.After rehydration at the later growth stage,the spectral reflectance and parameters of the red edge did not change significantly under mild stress compared with CK,but the amplitude and area of the red edge decreased significantly under moderate and severe stress.In the PLS models of full-spectrum based on original spectral reflectance and first-order differential spectral reflectance,and in the MLR models based on characteristic band,the optimal models were chlorophyll a content monitoring model based on R+SPA+MLR(R2 v=0.705,RMSEv=0.556,RPD=1.592),chlorophyll b content monitoring model based on 1st+PLS(R2 v=0.696,RMSEv=0.188,RPD=1.856),and carotenoid content monitoring model based on 1st+PLS(R2 v=0.493,RMSEv=0.138,RPD=1.261),respectively.

关 键 词：光合色素 高光谱 红边参数 偏最小二乘 

分 类 号：S512.1[农业科学—作物学]