中國的茶產(chǎn)量處于世界領先地位,但其生長在環(huán)境濕潤和溫暖的丘陵地帶,易受低溫凍害的影響和制約。為了增加產(chǎn)量,需要通過快速凍害檢測技術保護植物免受霜凍損害。這些技術可以評估半死亡臨界溫度和臨界寒冷溫度以及鑒定耐寒品種。目前,提出最有效的凍害檢測技術非常具有挑戰(zhàn)性,這種檢測技術可以快速提供所需的有效霜凍保護策略信息,幫助減少茶農(nóng)的生產(chǎn)損失。近年來,太赫茲光譜和高光譜成像技術已被用于評估食物和作物因凍結而引起的生理特性的變化。并與其他技術結合,對自身的屬性進行綜合分析。太赫茲技術在損傷檢測方面有卓越的應用。因此,太赫茲技術可以用來區(qū)分凍害的葉片和正常葉片,它們在太赫茲波段具有獨特的光譜信息。此外,細胞損傷的程度與從凍害細胞中逸出的水之間存在直接相關性,這使得太赫茲光譜響應與葉損傷的程度成比例相關。同時,從葉片中流出的水減少了太赫茲波透過的光路長度,導致更高的吸收。雖然茶葉樣品來自同一品種,但由于樣品的化學組成不同,樣品的吸收光譜可能會有所不同。因此,本研究的主要研究內容如下:（1）當組織受到0至-10°的凍害時,通過相對電導率（REC）、損傷指數(shù)和死亡臨界溫度(LT₅₀)... 

【文章頁數(shù)】：132 頁

【學位級別】：博士

【文章目錄】：
Abstract
中文摘要
Nomenclature
Chapter1 Introduction
    1.1 Cold damage risk in tea fields of temperate regions
    1.2 Physiognomies of Relative electrical conductivity and lethal temperature(LT50)
    1.3 Applications of terahertz time-domain spectroscopy in crop research
    1.4 Significance and objectives of the study
    1.5 Main content and dissertation organization
Chapter2 Literature Review
    2.1 Assessment of Plant Physiological Properties by Non-Destructive Techniques
        2.1.1 Terahertz(THz)Technology
        2.1.2 Chemometric Techniques in THz Spectroscopy
    2.2 Trends of Terahertz Spectroscopy and Hyperspectral imaging applications in crops
        2.2.1 Terahertz Spectroscopy
        2.2.2 Hyperspectral imaging
        2.2.3 Technical challenges with Hyperspectral imaging
    2.4 Frost Protection Methods
    2.5 Working Principle of Air Disturbance Technology for Crop Frost Protection
        2.5.1 Working Principle of the Technology
        2.5.2 Merits and Demerits of Ground Air Disturbance System
        2.5.3 Merits and Demerits of Aerial Air Disturbance System
        2.5.4 Control Strategies of Air Disturbance Technology
    2.6 Summary
Chapter3 Cold Tolerance Assessment for Tea by Relative Electrical Conductivity and Terahertz Time-Domain Spectroscopy
    3.1 Introduction
    3.2 Materials and Methods
        3.2.1 Tea plant samples preparation
        3.2.2 Determination of freezing tolerance of tea leaf
        3.2.3 Spectra assessment of freezing injury
        3.2.4 Signal processing of terahertz waveforms
        3.2.5 Critical temperature determination
        3.2.6 Determination of LT_(50)
        3.2.7 Statistical evaluation of THz spectra response performance
    3.3 Results and discussions
        3.3.1 Physiognomies of REC and the rate of cell injury
        3.3.2 The fitting equation and LT_(50)
    3.4 Spectra analysis
        3.4.1 Power spectrum
        3.4.2 Absorbance spectrum
        3.4.3 Phase shift spectrum
    3.5 Statistical comparison of the plant species
    3.6 Conclusions
Chapter4 Quantitative Analysis of NPK Effect on Freezing Injury for Tea(Camellia Sinensis)by Terahertz Spectroscopy
    4.1 Introduction
    4.2 Materials and Methods
        4.2.1 Tea plant samples preparation
        4.2.2 Spectra assessment of freezing tolerance
        4.2.3 Signal processing of terahertz waveforms
        4.2.4 Computation of2D correlation spectroscopy
        4.2.5 Statistical evaluation of Model performance
    4.3 Results and Discussion
        4.3.1 Spectra analysis of NPK effect
        4.3.2 Multivariate analysis by2DCoS-PLSR model
    4.4 Conclusions and Recommendation
Chapter5 Quantitative Assessment of Freezing Temperature Perturbation Effect on Cold Injury by Terahertz Spectroscopy Coupled with 2DCOS-PLSR Model
    5.1 Introduction
    5.2 Materials and Methods
        5.2.1 Tea plant samples preparation
        5.2.2 Spectra assessment of freezing tolerance
        5.2.3 Signal processing of terahertz waveform
        5.2.4 Computation of2D correlation spectroscopy
        5.2.5 Statistical evaluation of Model performance
    5.3 Results and Discussion
        5.3.1 Spectral analysis of freezing temperature effect
        5.3.2 Multivariate analysis by AI-PLSR and2DCOS-PLSR model
    5.4 Conclusions
Chapter6 Assessment of Nitrogen Effect on Cold Tolerance for Tea By Hyperspectral Reflectance with PLSR,PCR,and LM Models
    6.1 Introduction
    6.2 Materials and Methods
        6.2.1 Tea plant samples preparation
        6.2.2 Measurement of leaf reflectance
        6.2.3 Image processing
        6.2.4 Defect detection by Principal component analysis
    6.3 Results and discussions
        6.3.1 Characteristics of tea leaf spectrum and normalization
        6.3.2 Characteristics of tea leaf spectrum
        6.3.3 Freezing reflectance quantification using multivariate statistical models
    6.4 Conclusion
Chapter7 General Conclusions,Recommendations and Innovations
    7.1 General Conclusions
    7.2 Innovations/Novelty
    7.3 Recommendations for Future Works
Acknowledgements
References
Publications
Related Research Projects
Appendix


【參考文獻】：
期刊論文
[1]茶園高架風扇防霜系統(tǒng)設計與試驗[J]. 胡永光,李萍萍,戴青玲,張西良,田中一久,崔桂玲.  農(nóng)業(yè)機械學報. 2007(12)
[2]棉花冠層高光譜參數(shù)與葉片氮含量的定量關系[J]. 吳華兵,朱艷,田永超,姚霞,劉曉軍,周治國,曹衛(wèi)星.  植物生態(tài)學報. 2007(05)
[3]西瓜可溶性固形物含量近紅外透射檢測技術[J]. 田海清,應義斌,徐惠榮,陸輝山,傅霞萍.  農(nóng)業(yè)機械學報. 2007(05)



本文編號：3649784