基于高光谱成像技术的菜心铜胁迫快速检测

重金属污染已经成为影响农作物生长的重要环境因素,而铜是我国农业三大重金属污染物之一.农作物受到铜胁迫后,生长发育会受到极大的影响,如何实现对农作物铜胁迫的检测对于农业生产有着极大的意义.传统检测农作物铜胁迫的方法存在分析时间长、准确性不高、易对农作物造成损害等问题.本文提出一种基于高光谱成像技术的农作物铜胁迫的快速检测...

Rapid Detection of Copper Stress in Flowering Chinese Cabbage based on Hyperspectral Imaging Technology

Heavy metal pollution has become an important environmental factor affecting crop growth,and copper is one of the three major heavy metal pollutants in agriculture in China.The growth and development of crops will be greatly affected by copper stress.How to realize the detection of copper stress on crops is of great significance for agricultural production.Traditional methods for detecting copper stress in crops have problems such as long analysis time,low accuracy and easy to cause damage to crops.Therefore,we need to find a fast and non-destructive detection method.This paper presents a rapid detection method of copper stress in crops based on hyperspectral imaging technology.The healthy Chinese cabbage seedlings were divided into 5 groups with 8 strains in each group.Five Hoagland nutrient solutions containing 0.08(normal concentration),8,16,24 and 32 mg/L CuSO₄ were used for cultivation respectively.Hyperspectral images were collected at 1,3,5 and 7 days after cultivation.The spectral data were preprocessed by first-order differential(FD),multiple scattering correction(MSC)and standard normal variate(SNV).Partial least squares discriminant analysis(PLSDA)and support vector machine(SVM)were used for modeling analysis.The experimental results show that the SVM model is more effective and the detection accuracy can reach 86.11%when the 4-day total samples are modeled and analyzed.When the samples collected every day were separately modeled and analyzed,PLSDA showed better stability,with an average detection accuracy of 95%,and a better detection effect could be achieved one day after the crops were under copper stress.In summary,the application of hyperspectral imaging technology to achieve rapid detection of copper stress in crops is feasible,which has a certain reference value for the development of precision agriculture in China.