Effects of Phytophthora Root Rot Stress on Canopy Spectra Reflectance and Chlorophyll Fluorescence Characteristics of Soybean(PDF)
《大豆科学》[ISSN:1000-9841/CN:23-1227/S]
- Issue:
- 2013年04期
- Page:
- 490-495,500
- Research Field:
- Publishing date:
Info
- Title:
- Effects of Phytophthora Root Rot Stress on Canopy Spectra Reflectance and Chlorophyll Fluorescence Characteristics of Soybean
- Author(s):
- ?YANG Feng; HUANG Shan; WU Xiao-ling; LIU Wei-guo; YONG Tai-wen; YANG Wen-yu
- ?College of Agronomy,Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest,Ministry of Agriculture,Chengdu 611130,China
- Keywords:
- Disease stress; Vegetation index; Fluorescence characteristics; Hyperspectral remote sensing
- PACS:
- TP79
- DOI:
- 10.11861/j.issn.1000-9841.2013.04.0490
- Abstract:
- ?Hyperspectral crop reflectance data for detecting plant pathological stress are vital for precision crop protection.To analyze the correlation of photosynthetic pigments,chlorophyll fluorescence parameters and spectral reflectance under root rot disease stress,taking soybean as material,the differences under different extent root rot stress were discussed.The results showed that photosynthetic pigment concentrations(chlorophyll a,chlorophyll b,carotenoid,total chlorophyll and chlorophyll/carotenoid)and fluorescence parameters decreased with increasing degree of disease stress.The reflectance of nearinfrared region and depth of normalized reflectance also appeared similar result.In addition,the amplitude of red edge decreased and the red edge position moved to blue band under disease stress compared to health plants.The correlations between spectral characteristics,chlorophyll fluorescence parameter and photosynthetic pigment concentrations were significant except position and amplitude of green peak and MCARI. This provided an insight for choosing appropriate spectral characteristics and fluorescence parameters to monitor soybean root rot status by following the dynamics of photosynthetic pigment concentrations.
Last Update: 2014-02-20