Hyperspectral characterization of freezing injury and its biochemical impacts in oilseed rape leaves

REMOTE SENSING OF ENVIRONMENT

卷:195

Article

Wei, Chuanwen^1,3  Huang, Jingfeng^1,3  Wang, Xiuzhen⁴  Blackburn, George Alan⁵  Zhang, Yao^1,2  Wang, Shusen⁶  Mansaray, Lamin R.^1,3,7 

[1] Zhejiang Univ, Inst Appl Remote Sensing & Informat Technol, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Univ, Coll Nat Resources & Environm Sci, Minist Educ, Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China

[3] Zhejiang Univ, Key Lab Agr Remote Sensing & Informat Syst, Hangzhou 310058, Zhejiang, Peoples R China

[4] Hangzhou Normal Univ, Inst Remote Sensing & Earth Sci, Hangzhou 311121, Zhejiang, Peoples R China

[5] Univ Lancaster, Lancaster Environm Ctr, Lancaster, England

[6] Nat Resources Canada, Canada Ctr Remote Sensing, Ottawa, ON, Canada

[7] Sierra Leone Agr Res Inst, MLWERC, Dept Agrometeorol & Geoinformat, Tower Hill, Freetown 1313, Pmb, Sierra Leone

关键词: Hyperspectral reflectance;    Oilseed rape;    Freezing injury;    Detection;    Estimation;    Biochemical parameters;   

DOI  :  10.1016/j.rse.2017.03.042

来源: Elsevier

【 摘 要 】

Automatic detection and monitoring of freezing injury in crops is of vital importance for assessing plant physiological status and yield losses. This study investigates the potential of hyperspectral techniques for detecting leaves at the stages of freezing and post-thawing injury, and for quantifying the impacts of freezing injury on leaf water and pigment contents. Four experiments were carried out to acquire hyperspectral reflectance and biochemical parameters for oilseed rape plants subjected to freezing treatment. Principal component analysis and support vector machines were applied to raw reflectance, first and second derivatives (SDR), and inverse logarithmic reflectance to differentiate freezing and the different stages of post-thawing from the normal leaf state. The impacts on biochemical retrieval using particular spectral domains were also assessed using a multivariate analysis. Results showed that SDR generated the highest classification accuracy (>95.6%) in the detection of post-thawed leaves. The optimal ratio vegetation index (RVI) generated the highest predictive accuracy for changes in leaf water content, with a cross validated coefficient of determination (R-2) of 0.85 and a cross validated root mean square error (RMSECV) of 2.4161 mg/cm(2). Derivative spectral indices outperformed multivariate statistical methods for the estimation of changes in pigment contents. The highest accuracy was found between the optimal RVI and the change in carotenoids content (R-cv(2) = 0.70 and RMSECV = 0.0015 mg/cm(2)). The spectral domain 400-900 nm outperformed the full spectrum in the estimation of individual pigment contents, and hence this domain can be used to reduce redundancy and increase computational efficiency in future operational scenarios. Our findings indicate that hyperspectral remote sensing has considerable potential for characterizing freezing injury in oilseed rape, and this could form a basis for developing satellite remote sensing products for crop monitoring. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

Free