声明
Chapter 1 Introduction
1.1Cold damage risk in tea fields of temperate regions
1.2Physiognomies of Relative electrical conductivity and lethal temperature(LT50)
1.3Applications of terahertz time-domain spectroscopy in crop research
1.4Significance and objectives of the study
1.5Main content and dissertation organization
Chapter2 Literature Review
2.1Assessment of Plant Physiological Properties by Non-Destructive Techniques
2.1.1Terahertz(THz)Technology
2.1.2Chemometric Techniques in THz Spectroscopy
2.2Trends of Terahertz Spectroscopy and Hyperspectral imaging applications in crops
2.2.1 Terahertz Spectroscopy
2.2.2Hyperspectral imaging
2.2.3Technical challenges with Hyperspectral imaging
2.4 Frost Protection Methods
2.5Working Principle of Air Disturbance Technology for Crop Frost Protection
2.5.1Working Principle of the Technology
2.5.2Merits and Demerits of Ground Air Disturbance System
2.5.3Merits and Demerits of Aerial Air Disturbance System
2.5.4Control Strategies of Air Disturbance Technology
2.6 Summary
Chapter3 Cold Tolerance Assessment forTea by Relative Electrical Conductivity and Terahertz Time-Domain Spectroscopy
3.1 Introduction
3.2Materials and Methods
3.2.1Tea plant samples preparation
3.2.2Determination of freezing tolerance of tea leaf
3.2.3Spectra assessment of freezing injury
3.2.4Signal processing of terahertz waveforms
3.2.5Critical temperature determination
3.2.6Determination of LT50
3.2.7Statistical evaluation of THz spectra response performance
3.3Results and discussions
3.3.1Physiognomies of REC and the rate of cell injury
3.3.2The fitting equation and LT50
3.4Spectra analysis
3.4.1Power spectrum
3.4.2Absorbance spectrum
3.4.3Phase shift spectrum
3.5Statistical comparison of the plant species
3.6 Conclusions
Chapter4Quantitative Analysis of NPK Effect on Freezing Injury for Tea Plants by Terahertz Spectroscopy
4.1 Introduction
4.2Materials and Methods
4.2.1Tea plant samples preparation
4.2.2Spectra assessment of freezing tolerance
4.2.3Signal processing of terahertz waveforms
4.2.4Computation of 2D correlation spectroscopy
4.2.5Statistical evaluation of Model performance
4.3Results and Discussion
4.3.1Spectra analysis of NPK effect
4.3.2Multivariate analysis by 2DCoS-PLSR model
4.4Conclusions and Recommendation
Chapter5 Freezing Temperature Perturbation Effect on Cold Injury by Terahertz Spectroscopy Coupled with 2DCOS-PLSR Model
5.1 Introduction
5.2Materials and Methods
5.2.1Tea plant samples preparation
5.2.2Spectra assessment of freezing tolerance
5.2.3Signal processing of terahertz waveform
5.2.4Computation of 2D correlation spectroscopy
5.2.5Statistical evaluation of Model performance
5.3Results and Discussion
5.3.1Spectral analysis of freezing temperature effect
5.3.2Multivariate analysis by AI-PLSR and 2DCOS-PLSR model
5.4 Conclusions
Chapter6Assessment of Nitrogen Effect on Cold Tolerance for Tea by Hyperspectral Reflectance with PLSR, PCR,and LMModels
6.1 Introduction
6.2Materials and Methods
6.2.1Tea plant samples preparation
6.2.2Measurement of leaf reflectance
6.2.3Image processing
6.2.4Defect detection by Principal component analysis
6.3Results and discussions
6.3.1Characteristics of tea leaf spectrum and normalization
6.3.2Characteristics of tea leaf spectrum
6.3.3Freezing reflectance quantification using multivariate statistical models
6.4 Conclusion
Chapter7 General Conclusions,Recommendations and Innovations
7.1General Conclusions
7.2 Innovations/Novelty
7.3Recommendations for Future Work
致谢
参考文献
Publications
Papers under review
Related Research Projects
Appendix
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